What is desirability?

What is desirability? In reference to colleges and universities, desirability simply means that given a choice between two or more schools, which one have students actually chosen.

What is desirability?

What does the “desirability score” mean?

The desirability score that you see next to each university’s name is calculated based on actual student decisions. For example, when presented with a head-to-head competition, 67% of students pick Harvard over MIT, thus Harvard ranks #2 in desirability score while MIT ranks #3.

desirability flow chart

The graphic shows the head-to-head competitions between top schools that differ by one spot in their desirability score rankings (and two that differ by more than one spot to show some interesting exceptions). Not all the rankings based on the desirability score are statistically significant. For example, Stanford is listed at #1 and Harvard at #2, but the percent of students who choose Stanford over Harvard (53%) is very close to the percent of students who choose Harvard over Stanford (47%) and thus the null hypothesis that the schools have identical desirability cannot be rejected. Although this kind of ambiguity only happens once in the top 15 schools, it happens quite often for schools that aren’t in the top 50. Even when there is ambiguity between two schools, one always has a slightly higher desirability score than the other. We give the school with the larger desirability score the higher rank, which is what we did with Stanford and Harvard.

Only the top 70 or so schools have enough cross-admits (students who are admitted to both universities) to create a desirability score that is based on head-to-head competitions. For example, the US Coast Guard Academy at #68 and the US Merchant Marine Academy at #65 will have many head-to-head competitions due to students who apply and are admitted to both schools, but neither school will have much competition with the CA Institue of the Arts (#84), the RI School of Design (#85), or the Fashion Institute of Technology (#106). Thus, we use a Bayesian approach to construct desirability scores for schools that are not in the very highest tier.

Since different types of schools are hard to directly compare--for example, schools that train sailors versus schools that train artists--the best way to use these desirability scores is to look at them when you are comparing two fairly similar schools. It’s also important to remember that just because more people choose a school doesn’t mean it is better for you. Finally, the overall influence correlates with desirability, but not perfectly. In fact, that’s exactly why we decided to create the desirability score. Sometimes it’s more interesting to know where people want to go to college (desirability) than it is to know what college is home to famous people and professors (influence). And sometimes it’s more interesting the other way around!

We hope you enjoy looking at the desirability scores for different colleges. As always, don’t hesitate to give us feedback, especially about things you think will help us improve our methods.

Photo by Letizia Bordoni on Unsplash