A few numbers get repeated constantly in college admissions advice -- a school's real admit rate, its middle-50% SAT range, whether it weighs demonstrated interest. Almost all of it traces back to a single document: the Common Data Set (CDS), a standardized annual questionnaire that most accredited U.S. colleges fill out and publish themselves. It's less well known than it should be, considering how much of the "data" in this space is really just this one form, read (or misread) secondhand.
What it actually is
The CDS is a shared set of definitions and questions developed jointly by the College Board, Peterson's, and U.S. News & World Report specifically so that colleges report admissions, enrollment, and financial data the same way, using the same definitions, instead of every school defining "admit rate" or "class size" slightly differently. Each participating school fills out its own copy every year and typically posts it as a PDF on its institutional research or admissions office website -- it's self-reported, not audited by an outside party, the same caveat that applies to the underlying data behind college rankings.
How to find one
There's no single central search tool -- the standard method is a plain search for "[school name] common data set [year]," which almost always surfaces the right PDF directly from the school's own site within the first few results. Schools usually keep several recent years archived, so you can also track how a school's numbers have shifted cycle over cycle rather than only looking at the most current one.
The sections that actually matter to an applicant
The CDS runs long, but three sections do almost all the useful work for someone building a college list:
- Section C1 gives the raw counts behind the headline admit rate: how many students applied, how many were admitted, and how many enrolled, broken out further by early decision and early action where applicable. This is the actual arithmetic behind the "X% admit rate" figure you see quoted everywhere else -- calculated directly from the school's own numbers, not an estimate.
- Section C7 rates roughly nineteen individual admission factors -- academic rigor, GPA, test scores, essays, recommendations, extracurriculars, legacy status, and demonstrated interest among them -- as Very Important, Important, Considered, or Not Considered. This is the single most reliable way to check whether a specific school actually tracks demonstrated interest rather than guessing from its reputation, since it comes straight from the school rather than a secondhand assumption.
- Sections C9 through C11 report the enrolled class's academic profile: C9 gives SAT/ACT score breakdowns by percentile, C10 gives high school class rank distribution, and C11 gives high school GPA distribution. C9's percentile breakdown is exactly the "middle 50%" range that determines whether a school is a reach, target, or safety for you -- the CDS is where that range actually comes from, not an estimate a website generated.
Why it's still worth reading directly, even with tools that summarize it
A tool like this site's own calculator already pulls this kind of federal and institutional data together so you don't have to read a CDS PDF for every school on your list. But reading one directly is worth doing at least once, for the same reason checking a primary source is always worth it: a summary can compress or misstate something, and the CDS itself is the actual document a school stands behind. It's also the fastest way to answer a narrow, specific question -- "does this one school care about demonstrated interest," "what's this school's real early-decision admit rate versus its regular-decision rate" -- that a general summary tool isn't built to surface on its own.
The CDS may not stay the most granular public admissions data source for long, either -- a new federal reporting requirement called ACTS would eventually force schools to disclose admissions outcomes broken out by race, GPA band, test-score band, and income, a level of detail well past anything the CDS reports today. It's currently tied up in litigation, so treat it as a possible future supplement to the CDS, not a replacement you can rely on yet.
What this means for you
- Search "[school] common data set [year]" directly rather than relying only on secondhand summaries of a school's numbers -- the PDF is almost always freely available on the school's own site.
- Read Section C7 before assuming a school tracks demonstrated interest or weighs legacy status. It's a direct, school-reported answer, not a guess based on selectivity or reputation.
- Use Section C9's percentile breakdown as your real source for a school's middle-50% test range when categorizing it as a reach, target, or safety -- it's the primary data, not an estimate.
- Remember it's self-reported. The CDS is the standardized version of a school's own numbers, not an independently audited figure -- useful and far better than guesswork, but not infallible.
For a real, worked example of Section C7 across multiple schools at once, see how the 8 Ivy League schools' own Common Data Sets compare -- including two that don't consider class rank at all. Section C7 data isn't limited to the Ivies, either -- it's published directly on a school's own profile page wherever real coverage exists, including Rutgers University–New Brunswick and Pepperdine University.