CoolData blog

13 November 2014

How to measure the rate of increasing giving for major donors

Filed under: John Sammis, Major Giving, Peter Wylie, RFM — Tags: , , , , , , — kevinmacdonell @ 12:35 pm

Not long ago, this question came up on the Prospect-DMM list, generating some discussion: How do you measure the rate of increasing giving for donors, i.e. their “velocity”? Can this be used to find significant donors who are poised to give more? This question got Peter Wylie thinking, and he came up with a simple way to calculate an index that is a variation on the concept of “recency” — like the ‘R’ in an RFM score, only much better.

This index should let you see that two donors whose lifetime giving is the same can differ markedly in terms of the recency of their giving. That will help you decide how to go after donors who are really on a roll.

You can download a printer-friendly PDF of Peter’s discussion paper here: An Index of Increasing Giving for Major Donors


13 June 2012

Finding predictors of future major givers

Guest post by Peter B. Wylie and John Sammis

(Download a print-friendly .pdf version here: Finding Predictors of Future Major Givers)

For years a bunch of  committed data miners (we’re just a couple of them) have been pushing, cajoling, exhorting, and nudging  folks in higher education advancement to do one thing: Look as hard at their internal predictors of major giving as they look at outside predictors (like social media and wealth screenings). It seems all that drum beating has been having an effect. If you want some evidence of that, take a gander at the preconference presentations that will be given this August in Minneapolis at the APRA 25th Annual International Conference. It’s an impressive list.

So…what if you count yourself among the converted? That is, you’re convinced that looking at internal predictors of major giving is a good idea. How do you do that? How do you do that, especially if you’re not a member of that small group of folks who:

  • have a solid knowledge of applied statistics as used in both the behavioral sciences and “business intelligence?”
  • know a good bit about topics like multiple regression, logistic regression, factor analysis, and cluster analysis?
  • are practiced in the use of at least one stats application whether it’s SPSS, SAS, Data Desk, or R or some other open source option?
  • are actively doing data mining and predictive modeling on a weekly, if not daily basis?

The answer, of course, is that there is no single, right and easy way to look for predictors of major giving. What you’ll see in the rest of this piece is just one way we’ve come up with – one we hope you’ll find helpful.

Specifically, we’ll be covering two topics:

  • The fact that the big giving in most schools does not begin until people are well into their fifties, if not their sixties
  • A method for looking at variables in an alumni database that may point to younger alums who will eventually become very generous senior alums


Where The Big Money Starts

Here we’ll take you through the steps we followed to show that the big giving in most schools does not begin until alums are well into their middle years.

Step 1: The Schools We Used

We chose six very different schools (public and private, large and small) spread out across North America. For five of the schools, we had the entire alumni database to work with. With one school we had a random sample of more than 20,000 records.

Step 2: Assigning An Age to Every Alumni Record

Using Preferred class year, we computed an estimate of each alum’s age with this formula:

Age = 2012 – preferred class year + 22

Given the fact that many students graduate after the age of 22, it’s safe to assume that the ages we assigned to these alums are  slight to moderate underestimates of their true ages.

Step 3: Computing The Percentage of  The Sum of Lifetime Dollars Contributed by Each Alum

For all the records in each database, we computed each alum’s percentage of the sum of lifetime dollars contributed by all solicitable alums (those who are living and reachable). To do this computation, we divided each alum’s lifetime giving by the sum of lifetime giving for the entire database and converted that value to a percentage.

For example, let’s assume that the sum of lifetime giving for the solicitable alums in a hypothetical database is $50 million. Table 1 shows both the lifetime giving and the percent of the sum of lifetime giving for three different records:

Table 1: Lifetime Giving and Pecentage of The Sum of All Lifetime Giving for Three Hypothetical Alums

Just to be clear:

  • Record A has given no money at all to the school. That alum’s percentage is obviously 0.
  • Record B has given $39,500 to the school. That alum’s percentage is 0.079% of $50 million.
  • Record C has given $140,500 to the school. That alum’s percentage is 0.280% of $50 million.

Step 4: Computing The Percentage and The Cumulative Percentage of The Sum of Lifetime Dollars Contributed by Each of 15 Equal-Sized Age Groups of  Alums

For each of the six schools, we divided all alums into 15 roughly equal-sized age goups. These groups ranged from alums in their early twenties to those who had achieved or passed the century mark.

To make this all clear we have used School A (whose alums have given a sum of $164,215,000) as an example. Table 2 shows the:

  • total amount of lifetime dollars contributed by each of these age groups in School A
  • the percentage of the $164,215,000 contributed by these groups
  • the cumulative percentage of the $164,215,000 contributed by alums up to and including a certain age group

Table 2: Lifetime Giving, Percent of Sum of Lifetime Giving, and Cumulative Percent of Sum of Lifetime Giving for Fifteen Equal-Size Age Groups In School A

Here are some things that stand out for us in this table:

  • All alums 36 and younger have contributed less than 1% of the sum of lifetime givng.
  • For all alums under age 50 the cumulative amount given is just over 7% of the sum of lifetime givng.
  • For all alums under age 62 the cumulative amount given is less than 30% of the sum of lifetime givng.
  • For all alums under age 69 the cumulative amount given is slightly more than 40% of the sum of lifetime givng.
  • Well over 55% of the sum of lifetime givng has come in from alums who are 69 and older.

The big news in this table, of course, is that the lion’s share of  money in School A has come in from alums who have long since passed the age of eligibility for collecting Social Security. Not a scintilla of doubt about that.

But what about all the schools we’ve looked at? Do they show a similar pattern of giving by age? To help you decide, we’ve constructed Figues 1 – 6 that provide the same information as you see in the rightmost column of Table 2: The cumulative percentage of all lifetime giving contributed by alums up to and including a certain age group.

Since Figure 1 below captures the same information you see in the rightmost column of Table 2, you don’t need to spend a lot of time looking at it.

But we’d recommend taking your time looking at Figures 2-6. Once you’ve done that, we’ll tell you what we see.

These are the details of what we see for Schools B-F:

  • School B: Alums 48 and younger have contributed less than 5% of the sum of lifetime giving. Alums 70 and older have contributed almost 40% of the sum.
  • School C: Alums 52 and younger have contributed less than 5% of the sum. Alums 70 and older have contributed more than 40% of the sum.
  • School D: Alums 55 and younger have contributed less than 30% of the sum. Alums 70 and older have contributed almost 45% of the sum.
  • School E: Alums 50 and younger have contributed less than 30% of the sum. Alums 61 and older have contributed more than 40% of the sum.
  • School F: Alums 50 and younger have contributed less than 20% of the sum. Alums 68 and older have contributed well over 50% of the sum.

The big picture? It’s the same phenomenon we saw with School A: The big money has come in from alums who are in the “third third” of their lives.

One Simple Way To Find Possible Predictors of The Big Givers on The Horizon

Up to this point we’ve either made our case or not that the big bucks don’t start coming in from alumni until they reach their late fifties or sixties. Great, but how do we go about identifying those alums in their forties and early fifties who are likely to turn into those very generous older alums?

It’s a tough question. In our opinion, the most rigorous scientific way to answer the question is to set up a longitudinal study that would involve:

  1. Identifying all the alums in a number of different schools who are in the forties and early fifties category.
  2. Collecting all kinds of data on these folks including giving history, wealth screening and other gift capacity information, biographic information, as well as a host of fields that are included in the databases of these schools like contact information, undergraduate activities, and on and on the list would go.
  3. Waiting about ten or fifteen years until these “youngsters” become “oldsters” and see which of all that data collected on them ends up predicting the big givers from everybody else.

Well, you’re probably saying something like, “Gentlemen, surely you jest. Who the heck is gonna wait ten or fifteen years to get the answers? Answers that may be woefully outdated given how fast society has been changing in the last twenty-five years?”

Yes, of course. So what’s a reasonable alternative? The idea we’ve come up with goes something like this: If we can find variables that differentiate current, very generous older alums from less generous alums, then we can use those same variables to find younger alums who “look like” the older generous alums in terms of those variables.

To bring this idea alive, we chose one school of the six that has particularly good data on their alums. Then we took these steps:

We divided alums 57 and older into ten roughly equal size groups (deciles) by their amount of lifetime giving. Figure 7 shows the median lifetime giving for these deciles.

Table 3 gives a bit more detailed information about the giving levels of these deciles, especially the total amount of lifetime giving.

Table 3: Sum of Lifetime Dollars and Median Lifetime Dollars for 10 Equal Sized Groups of Alums 57 and Older

We picked these eight variables to compare across the deciles:

  • number of alums who have a business phone listed in the database
  • number of alums who participated in varsity athletics
  • number of alums who were a member of a greek organization as an undergraduate
  • number of alums who have an email address listed in the database
  • number of logins
  • number of reunions attended
  • number of  years of volunteering
  • number of events attended

Before we take you through Figures 8-14, we should say that the method we’ve chosen to compare the deciles on these variables is not the way a stats professor nor an experinced data miner/modeler would recommend you do the comparisons. That’s okay. We were aiming for clarity here.

Let’s go through the figures. We’ve laid them out in order from “not so hot” variables to “pretty darn good” variables.

It’s pretty obvious when you look at Fig. 8 that bigger givers, for the most part, are no more likely to have a business phone listed in the database than are poorer givers.

Varsity athletics? Yes, there’s a little bit of a trend here, but it’s not a very consistent trend. We’re not impressed.

This trend is somewhat encouraging. Good givers are more likely to have been a member of a Greek organization as an undergraduate than not so good givers. But we would not rate this one as a real good predictor.

Now we’re getting somewhere. Better givers are clearly more likely to have an e-mail address listed in the database than are poorer givers.

This one gets our attention. We’re particularly impressed with the difference in the number of logins for Decile 10 (really big givers) versus the number of logins for the lowest two deciles. At this school they should be paying attention to this variable (and they are).

This figure is pretty consistent with what we’ve found across many, many schools. It’s a good example of why we are always encouraging higher ed institutions to store reunion data and pay attention to it.

This one’s a no-brainer.

And this one’s a super no-brainer.

Where to Go from Here

After you read something like this piece, it’s natural to raise the question: “What should I do with this information?”  Some thoughts:

  • Remember, we’re not assuming that you’re a sophisticated data miner/modeler. But we are assuming that you’re interested in looking at your data to help make better decisions about raising money.
  • Without using any fancy stats software and with a little help from your advancement services folks, you can do the same kind of analysis with your own alumni data as we’ve done here. You’ll run into a few roadblocks, but you can do it. We’re convinced of that.
  • Once you’ve done this kind of an analysis you can start looking at some of your alums who are in their forties and early fifiteies who haven’t yet jumped up to a high level of giving. The ones who look like their older counterparts with respect to logins, or reunion attendance, or volunteering (or whatever good variables you’ve found)? They’re the ones worth taking a closer look at.
  • You can take your analysis and show it to someone at a higher decision-making level than your own. You can say, “Right now, I don’t know how to turn all this stuff into a predictive model. But I’d like to learn how to do that.” Or you can say, “We need to get someone in here who has the skills to turn this kind of information into a tool for finding these people who are getting ready to pop up to a much higher level of giving.”
  • And after you have become comfortable with these initial explorations of your data we encourage you to consider the next step – predictive modeling based on those statistics terms we mentioned earlier. It is not that hard. Find someone to help you – your school has lots of smart people – and give it a try. The resulting scores will go a long way toward identifying your future big givers.

As always: We’d love to get your thoughts and reactions to all this.

10 March 2011

Gifts of stock as a predictor of Major Gift potential

Filed under: Major Giving, Model building, predictive modeling, Predictor variables, regression — Tags: , — kevinmacdonell @ 6:09 am

(Image used via Creative Commons license. Click image for source)

In an earlier post, I wrote about giving-related variables and whether or not they’re okay to use in a model that is trying to predict giving itself. (My answer was “it depends”. See Giving-related variables: Keep or leave out?) Today I zero in on a specific example: gifts of securities as a predictor of major giving.

Following the logic of my earlier post, if the sample of people whom you intend to score includes non-donors, and you want non-donors to have a chance of making it onto the radar, then you must rule out ‘Gift of Stock’ as a predictor. Why? Because you want to keep any proxy for your outcome variable (the Y side of your equation) out of the predictors (the X side of the equation), as much as possible. A ‘yes’ for ‘Has made a gift of stock’ is possible ONLY for the donors in your sample, and will provide no insight into a non-donor’s potential for major giving.

But giving-related variables are frequently used to predict major gift potential. Gift count, first gift, recency, and stock gifts are all enticing predictors. You have a decision to make: Do you exclude non-donors, or leave non-donors in and forgo the potential predictive power of these variables?

For some the answer might be easy. If the vast majority of major donors to your institution had some prior giving before making their biggest gifts, and a major gift from a non-donor is extremely unlikely, then it makes sense to exclude non-donors. This makes most sense for alumni models: Alumni who are solicited every year and don’t give are rather unlikely to turn around and give a million dollars. (Although it happens!)

You can avoid having to make the decision, however, if you build two models: One including non-donors (and using no giving-related variables), and one excluding them (freeing your hand to use giving-related variables). That’s what I do. I test the output scores against a holdout sample of major donors, and whichever model outperforms in scoring the major donors will be my choice for that year.

Let’s say that at least one of your models is a donor-only model, and you’re itching to use ‘Stock gifts’ as a predictor. Hold on! You’re not done yet. You need to evaluate the degree to which ‘Stock gifts’ is independent of your DV. If the variable equates to major giving itself, it is not at all independent and should be excluded. It is merely a proxy for being a major donor.

It’s clear that stock givers are different from other donors. In the data set I have before me, alumni who have made at least one gift of stock have median lifetime giving of about $40,000, compared with all other donors’ median giving of about $170. More than 66% of stock donors have lifetime giving over $25,000, and more than 90% of them have made at least one gift of $1,000 or greater.

The fact of having given a gift of securities cannot seriously be considered “independent” of the DV, but the degree of non-independence varies with how the DV is defined. If I define it as “LT Giving over $25K”, I’m probably in the clear, because a considerable portion of stock donors (34%, in my data set) fall outside the definition of my DV. If my DV is “One or more gifts of $1K or greater,” however, I should steer clear of the stock-gifts predictor. True, not all stock donors are in the DV, but almost all of them are.

Stock donors probably represent a very small percentage of all your donors, so the variable may have little influence either way: Not a high-value predictor, but not a damaging one, either. (Given the limited number in your sample, the correlation coefficient is going to be pretty low.) Maybe if 85% of the stock donors were in my DV, instead of 90%, I might go ahead and use it. So in the end, it’s a judgment call based on what seems to make sense for your data and what you hope to get out of it.

2 November 2010

Finding prospects flying under the radar: A nuts and bolts approach

Guest post by Peter Wylie and John Sammis

(Downloadable/printable version available here as a PDF: Flying Under the Radar)

Let’s say you’re a prospect researcher in higher education.  You’re getting some pressure – from your boss, from some of the gift officers you work with, maybe the campaign director – to come up with a list of new prospects. They use different words, but their message is clear:

“We’ve picked the low hanging fruit. We don’t want to keep going back to the same alums who’ve been helping us out in a big way for a long time. We need to find some new people who have the capacity and willingness to make a nice gift. Maybe not a huge gift, but a nice gift.”

If you’ve been working in the field awhile, this isn’t the first time you’ve faced this problem, nor is it the first time somebody has offered advice on how to solve it. Truth be told, you may have gotten too much advice:

  • “You haven’t done a screening for five years. You need to do a new one.”
  • “Our company has gotten very sophisticated about predictive modeling as well as gift capacity ratings. Use us.”
  • “You’re not using social media resources effectively. Facebook and MySpace are great places to find out about alums who have lots of financial resources and are philanthropically inclined.”
  • “You need to learn how to do data mining and predictive modeling or add somebody to your staff who already knows how to do it.”

It’s not that any of this advice is bad, even if it comes from a vendor whose goal is to get some of your business. The problem is that you, or the person you report to, has to sift through this advice and make some kind of decision — even if that decision is to do nothing different from what you’re currently doing.

Since John Sammis and I are some of the people out there offering this kind of advice to advancement folks, we often ask ourselves: “Are we making things too complicated for the people we’re trying to help?” Often the answer we come up with is, “Probably.” Why? That’s a whole can of worms we’d rather not get into. The short answer is that both of us grew up in an educational system where precious few of our teachers and authors of our textbooks were good at making things simple and clear. And like it or not, we’ve inherited some of their tendencies to obfuscate rather than elucidate. But we fight against it as best we can.

Hopefully we’ve won that battle in this piece. (You’ll decide if we have.) Anyway, what we’ve done here is use some data from a large public higher education institution to walk you through a simple process for finding new prospects.

Before we do that, let’s start off with three assumptions:

  • You have fairly recent gift capacity ratings for several thousand of your solicitable alums, some of whom you think may be good, untapped prospects.
  • You have ready access to someone who can develop a simple score for all those alums with respect to their affinity to give to your school.
  • You have reasonably good profiles on each of these alums. That is, those profiles include information like lifetime hard credit dollars given; date and amount of last gift; date and amount of first gift; what gift officers have ever been assigned to those alums and when; the most recent occupation of the alum; and so on.

Here are the steps we want to take you through:

1.     Look at the distribution of gift capacity ratings for the alums you’ve recently screened.

2.     Look at the giving data for these alums by gift capacity ratings.

3.     Have someone build you a simple affinity model using some very basic information stored on each alum.

4.     Pick a small group of alums who have a high capacity rating, a high affinity rating, and are not currently assigned to a gift officer.

5.     Look closely at the alums in this small group and identify some who may deserve more scrutiny.

We’ll go through each of these steps in detail:

Look at the distribution of gift capacity ratings for the alums you’ve recently screened.

Whenever you have a field of data (whether it comes from your own database or has been delivered to you by a vendor), it’s a good idea to make a frequency distribution of the field. (In statistics the term is “variable,” not “field,” so from here on out we’ll say “variable.”)

Here are a couple of reasons for doing this:

  • You get a big picture look at the variable. Our experience is that most people in higher education advancement don’t do this for the many variables they have in their alumni databases. For example, let’s say you asked the average associate vice president for advancement in a college or university this question: “What percentage of your solicitable alums have given $100 or less lifetime hard credit?” Our bet is that the vast majority would have no idea of what the correct answer was; moreover, they would be shocked if you told them.
  • You get a chance to see if there is anything out of the ordinary about the data that’s worth further exploration. Here’s a good example. When doing predictive modeling for a school, we look closely at the variable “preferred class year.” It’s a measure of how long alums have been out of school, and it’s a reasonably good measure of age. It’s not at all uncommon for us to encounter thousands of records coded as “0000” or, say, “1700.” Call it a hunch, but we’re pretty sure those folks didn’t graduate the year Christ was born, nor 75 years or so before the Declaration of Independence got signed. When we encounter a problem like this, of course, we ask the advancement services people we’re working with what those codes mean. The answers vary. Sometimes such codes indicate alums who are non-degreed. Sometimes they indicate alums who simply received a certain kind of certificate. Or they indicate something else. The important thing is that we ask; we clear up the mystery.

All right, Table 1 shows a distribution of the gift capacity ratings for a group of about 22,000 alums in the public higher education institution we mentioned earlier. Figure 1 displays the same distribution graphically. Take a minute or two to look at both of them. Then you can compare what you see with what we noticed.

Table 1: Estimated $Gift Capacity for Over 22,000 Alumni Divided Into 20 Groups of Roughly 5% Each

For us, two things about these data stand out:

1.     Some of the data are a little hard to believe. Let’s take a look at Group 1 in Table 1. There are 1123 records in this group. They comprise alums with the lowest five percent of gift capacity ratings. If you look at the “min” column, you’ll see that the lowest gift capacity rating is one dollar. Really? That alum must be down on his or her luck. You can’t see all the data in this distribution the way we can, but there are a total of 11 alums whose gift capacity is listed as being under $100. Obviously, you should be suspicious of such ratings. Contacting the vendor who generated them is a must. And politely staying after them until you get an acceptable answer is the right thing to do.

2.     The capacity ratings rise slowly until we get to the top ten percent of alums. There’s nothing particularly surprising about this. However, it is interesting (without showing you all the arithmetic) that, of the roughly one billion dollars of total gift capacity for these alums, over half a billion of that gift capacity resides with the top 10% of the alums.

Look at the giving data for these alums by wealth capacity ratings.

We’ve taken a look at the distribution of gift capacity ratings for the alums we’ve screened. Now let’s look at how those capacity ratings are related to the money the same alums have given to the school.

We’ll start with Table 2. The two columns on the right of the table (“Total$ given” and “Max$ given”) contain the most important pieces of information in the table. The “Total” column simply shows the total lifetime dollar amount given for the alums at each of the 20 gift capacity levels. The “Max” column shows the maximum amount any one alum has given at each of these levels.

Table 2: Giving Data for Over 22,000 Alumni Divided Into 20 Groups of Roughly 5% Each by Gift Capacity

We see a pattern that emerges from this table, but it’s a little hard to detect. So go ahead and take a look at Table 3 and Figure 2. Then we’ll offer our thoughts.

Table 3: Percentage of Alums Giving $50 or More Lifetime by Gift Capacity Level

When we look at these two tables and this one figure, two conclusions emerge for us:

1.     There is some relationship between gift capacity and giving, but it’s not a strong one.

2.     If we can believe the gift capacity ratings, there is a huge amount of untapped potential for giving, especially at the highest capacity levels.

Let’s start with the first conclusion, that there is not a strong relationship between capacity and giving. How do we arrive at the conclusion? Let’s go back to Table 2. Now if we just look at the five percent of alums with the lowest giving capacity (Group 1) and the five percent of alums with the highest giving capacity (Group 20), we see that the total lifetime giving goes from $34,062 to $2,396,810. That’s a big difference. The wealthiest alums have given about 70 times as much as the least wealthy alums. Also, the most generous alum in the lowest capacity group has given a lifetime total of $2,005 compared to the most generous alum in the highest capacity group who has given a lifetime total of $224,970. Again, we see a big difference.

But look at what happens in between these two extremes. Things bounce around a lot. For example, let’s compare the giving between capacity level 3 and capacity level 12. The total giving amount for the former group is $152,741; the total giving amount for the former group is $125,477. In other words, alums with a much higher giving capacity have given less than alums with a much lower giving capacity.

Further evidence of this “bouncing around” is apparent when you look at Figure 2 (a graphic version of Table 3). This chart shows the percentage of alums at each of the 20 giving capacity levels who have given $50 or more lifetime to the school. Notice how these percentages dip in the middle of the capacity range.

So let’s go back to our conclusion that there is some relationship between gift capacity and giving, but that it’s not a strong relationship. Yes, the overall trend of giving goes up with gift capacity, but we can in no way conclude that knowledge of an alum’s gift capacity is a good indication of how much he/she has given.

Okay, how about our second conclusion that there is a huge amount of untapped potential for giving, especially at the highest capacity levels? We think Figure 2 provides plenty of support for that conclusion. Look at the highest gift capacity level. Barely 50% of the alums in this category have given over $50 lifetime. Not as a single gift. No. Lifetime.

If that doesn’t convince you of the untapped potential for giving among such wealthy alums, we’re not sure anything will.

Have someone build you a simple affinity model using some very basic information stored on each alum.

Now comes the tricky part. Now comes the part where we risk losing you because we get a little too technical. We don’t want to do that. We want to avoid having you end up saying, “Geez, these guys said they were gonna make this simple, but they didn’t. Now I’m more confused than I was before I started reading this thing.”

This is not a perfect solution to the problem, but we think it might work. We’d like you to find someone who works at your school who can help you. Of course, it would be great if you already had someone on your advancement staff who fits that bill – someone whose job is focused on data mining and predictive modeling. Some schools have folks like that, but most don’t. (We’re assuming you don’t, otherwise there wouldn’t be a whole lot of need for you to be reading this piece.)

Anyway, the person you’re looking for is probably a stats professor in the psychology or education department, a graduate student pursuing a degree in that area, or someone who works in what is often called “institutional research.” Ideally, the person you find should be:

  • Someone who is helpful and accommodating. This seems obvious, but, sadly, a lot of people in higher education don’t meet these criteria. Maybe a quick and easy way to decide is to ask yourself: “If I walked into a high end department store, is this a person I would want to help me?” If your answer is not an unequivocal “yes,” you should keep looking.
  • Someone who is good at explaining things in clear, simple English. Candidly, a lot of people in the technical arena are not good at this. As we said earlier, the two of us (try as we might) struggle with making things clear to the people we work with. What we’d suggest is that you look for someone who is patient with you when you don’t understand something they say. You especially want to avoid someone who acts the least bit impatient and condescending if you don’t “get” something the first time they explain it.
  • Someone who knows at least a little about major giving. The person does not need to be an expert in prospect research. But he or she should have a sense of how an advancement office works and some of the pressure that prospect researchers and development officers endure, especially when they’re scrambling to meet campaign goals.
  • Someone who has good skills with a stats software package. We think this is a must. If the person only knows how to use Excel to analyze data, that’s not good enough. The person needs to be proficient in a package like SPSS, which is widely available on college and university campuses. John and I prefer a package called Data Desk, but the important point is that your person needs to be proficient with an application whose purpose is sophisticated data analysis.
  • Someone who’s had some experience with multiple regression. You may or may not have heard of multiple regression. Don’t worry about that. Just be able to confirm that the person who helps you has a solid working knowledge of the technique. A good way to find out if that’s the case is to ask the person to explain the technique using a simple example using some of your own data.

Let’s assume you’ve found someone to help you. As we said earlier, if you follow our plan, that person will build you a simple affinity model using some very basic information stored on each alum for whom you have a capacity rating.

For the benefit of that person, we’ve described below how we developed the model for the school we’re using as an example. We’ve tried to provide just enough detail to give your person a guide, but not so much that we bog the paper down with too many words.

Enclosed in the boxes below (so you can skip over it if you wish) is a summary of what we did:

We chose lifetime hard credit giving as our dependent variable. To each record we added one dollar of giving to arbitrarily rid the sample of zero givers. We then performed a log to the base 10 transformation on this variable to reduce as much of the positive skewness as possible. 

We chose the following predictors (independent variables) for entry into our multiple regression analysis:

  • MARITAL STATUS MISSING (the alum was given a 1 if there was no marital status listed for him/her in the database, otherwise a 0)
  • MARITAL STATUS SINGLE (the alum was given a 1 if he/she was listed as “single” in the database, otherwise a 0)
  • CLASS YEAR (the alum’s preferred year of graduation)



  • HOME PHONE LISTED (a 1 if a home phone was listed in the database for the alum, otherwise a 0)
  • BUSINESS PHONE LISTED (a 1 if a business phone was listed in the database for the alum, otherwise a 0)
  • EVENT ATTENDED (a 1 if an alum was listed as ever attending an event after graduation, otherwise a 0)
  • E-MAIL LISTED (a 1 if an e-mail address was listed in the database for the alum, otherwise a 0)

Table 4 summarizes the results of the regression analysis:

Table 4: Regression Analysis Table for the Simple Model Developed for This Paper

R squared = 24.9%     R squared (adjusted) = 24.9%
s =  0.9835  with  22446 – 9 = 22437  degrees of freedom
Source Sum of Squares df Mean Square F-ratio
Regression 7213.27 8 901.659 932
Residual 21701.5 22437 0.967218
Variable Coefficient s.e. of Coeff t-ratio prob
Constant -1603.28 218.2 -7.35  ≤ 0.0001
MARITAL STATUS MISSING -0.333961 0.01845 -18.1  ≤  0.0001
MARITL STATUS SINGLE -0.472877 0.01603 -29.5  ≤  0.0001
HP LISTED 0.243367 0.01496 16.3  ≤  0.0001
BP LISTED 0.685641 0.03374 20.3  ≤  0.0001
CLASS YEAR 1.64819 0.2196 7.51  ≤  0.0001
SQUARE OF CLASS YEAR -4.23E-04 5.52E-05 -7.66  ≤  0.0001
EVENT ATTENDED (YES/NO) 0.712603 0.05089 14  ≤  0.0001
EMAIL LISTED 0.422934 0.01487 28.4  ≤  0.0001

We divided the predicted scores from the regression for alums with the highest gift capacity into twenty roughly equal-sized groups where 1 was low and 20 was high.

Okay, where are we here? In the “boxed in” technical suggestion above, the last thing we said was: “We divided the predicted scores from the regression analysis for alums with the highest gift capacity into twenty roughly equal-sized groups where 1 was low and 20 was high.” Well, what does that actually mean?

Let’s start with the specific group of alums we’re most interested in looking at. These are the 1,123 alums who got the highest gift capacity ratings. If you go all the way back to Table 1 (which you don’t really need to do), you’ll see that their total gift capacity is $405,958,000 – a lot of money.

Our regression analysis created a very granular affinity score for this group. It had 408 different levels. The alums with the lowest of these scores (according to the regression analysis) are least likely to give a lot of money to the school; the alums with the highest of these scores are the most likely to give a lot of money to the school.

That’s terrific, but 408 score levels is a lot of levels to get your arms around. So what we did is take those scores and chop them up into 20 roughly equal sized groups from 1 to 20, and (again) 1 represents the lowest scores; 20 represents the highest scores. Detailed giving data on all these 1,123 alums is displayed in Table 5 below. We can look at those data in a moment, but let’s move on to our next step.

Pick a small group of alums who have a high capacity rating and a high affinity rating.

Table 5 gives us lots of information about where we’re likely to find this small group. Let’s see what looks interesting here. Remember, everyone in this total group of 1,123 alums has a gift capacity rating greater than $116,000. This is a wealthy bunch of folks – no question about that.

We’ll start with the lowest group, group 1. These 56 alums have the lowest affinity scores of the total group, and their giving data confirms that. Look at the value for these alums in the “sum” column: $430. That means that all 56 alums, as a group, have given less than $500 lifetime to the school. That works out to a mean (average) lifetime gift of less than $8 per alum. Our conclusion? These folks may be wealthy, but both their affinity score and their history of giving have them speaking loud and clear: “Our philanthropic interests are aimed at worthy causes other than our alma mater.”

Now let’s jump up to the top group, group 20. Notice that there are exactly the same number of alums in this group as in group 1 (56), but the giving data for this top group is quite different from the bottom group. Most notably, they’ve given a total of $483,789, well over a thousand times as much as the bottom group. So here we have a group of alums who (a) we know are wealthy; (b) have a high affinity rating developed from the regression analysis; and (c) have already given the school quite a bit of money.

Table 5: Giving Data for Over 1,123 Very High Gift Capacity Alumni Divided Into 20 Groups of Roughly 5% Each by Affinity Score

Look closely at the alums in this small group and identify some who may deserve more scrutiny.

Now we can take a very close look at this group in Table 6 (below, near the end of this post). It lists the total giving and gift capacity for each of these 56 records. (Remember, each of the 56 alums has a high gift capacity rating, and each has an affinity score that says they really like the school.)

We’ll start off with a couple of alums who have already given a considerable amount to the school. What’s particularly interesting about these two is how different they look from the perspective of the possibility of very large future gifts.

  • Record #1: From the looks of things, this person is probably well known to the research staff and to the gift officers. The person has given more than $100,000 and has a gift capacity that’s not a whole lot more than that amount. We’re pretty sure the school would like to have a lot more alums like this one.
  • Record #7: We find this one pretty interesting. The alum has given a bit over $21,000 lifetime, but their gift capacity is listed as well over $13 million. Since the alum clearly likes the school, and they have considerable wherewithal to give a lot more, why haven’t they given a lot more? Maybe there’s a good reason, maybe not. At the very least this is someone who deserves continued attention both from the prospect research side of the house and the gift officer side of the house.

Now we’ll move down to five alums (Records #15, 17, 18, 20, and 24) all of whom have given less than $6,000 lifetime but whose gift rapacity ratings all exceed $400,000. Here we are probably in the neighborhood of prospects who truly are flying under the radar. They may have been assigned to a gift officer. And when a prospect researcher looks at their profiles, the researcher may say, “Yeah, we know about him.” But our experience tells us that alums like these are worth a harder look. For example, we would ask:

  • Is the alum really assigned to a gift officer, or did the last gift officer simply write the alum off as not a “good prospect” with no good documentation as to why that decision was made?
  • What does the alum do for a living? Does that occupation (e.g., investment banker) jibe with the gift capacity rating?
  • Has the alum been an active volunteer or season ticket holder?
  • Is he or she at the age where a sizeable planned gift might be a possibility?

You get the idea. With folks like these we think you should dig a little. Some of them may be at what Malcolm Gladwell calls “the tipping point.” They may be right on the verge of making a much larger gift if you do a little more research on them and send the right gift officer out to meet with them.

By the way, take a look at Record #56. This person is really rich, the internal data says he/she really likes the school, but this person hasn’t given any money. We’d sure like to know the story about this person.

At the ending of Table 6 we offer some closing comments. We really appreciate your staying with us up to this point.

Table 6: Giving and Gift Capacity Data for All 56 Alums in the Highest Affinity Group

Some Closing Comments

We’ve put a lot of tables and charts in front of you. That’s a lot of information to absorb. Several thoughts that might be helpful:

  • If you found what we’ve said here intriguing but also a bit confusing, put the piece away for a few days. Then take another look at it. It should be clearer the second time around. If it’s not, please feel free to contact John Sammis at and Peter Wylie at
  • Share what we’ve written here with a colleague whose opinion you respect but who disagrees with you about a lot of things. That should make for an “interesting” discussion.
  • Whatever you do, we hope this piece encourages you and others in your advancement group to take a closer look at all the data you store on your alumni. The two of us will never back away from the importance of doing that when you’re trying to save money on appeals and generate more revenue for worthwhile projects.

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