How to Read a Common Data Set: A Hidden Tool in College Research

Why this matters

If you've never heard of the Common Data Set, you're missing one of the most useful college research tools available. It's free, public, and full of details that schools don't always highlight in marketing.

What it is

The Common Data Set (CDS) is a standardized form that most colleges complete annually. It collects information about admissions, enrollment, financial aid, classes, faculty, and outcomes in a consistent format across schools. The point of standardization: you can compare schools on the same metrics. The CDS is what makes apples-to-apples comparison possible across thousands of colleges.

Where to find it

Most schools publish their CDS on their website. The easiest way to find it: If a school doesn't publish its CDS, that's information too. Most accredited schools do.

• Search: "[school name] common data set"
• Look on the school's institutional research, planning, or transparency pages
• Some schools archive multiple years; recent CDSs are most useful

What's in it

The CDS has lettered sections covering: Each section has dozens of specific data points.

• Section A: General institutional information
• Section B: Enrollment and persistence (graduation rates, demographics)
• Section C: First-time freshman admission (acceptance rates, test scores, factors considered)
• Section D: Transfer admission
• Section E: Academic offerings and policies
• Section F: Student life
• Section G: Annual expenses
• Section H: Financial aid (the gold mine)
• Section I: Instructional faculty and class size
• Section J: Disciplinary majors

Section C: Admissions

This is where most students focus first. Useful data: The "factors considered" table tells you what matters in admissions. If "demonstrated interest" is listed as "very important," it really matters.

• Acceptance rate
• Middle 50% test scores (SAT, ACT)
• Admission factors and their weight (academic vs. non-academic)
• Demonstrated interest tracking
• Application requirements

Section H: Financial aid

Often the most useful section. Useful data: This section tells you whether a school's aid generosity matches your situation.

• Average financial aid package size
• Percentage of students with demonstrated need who had it fully met
• Average loan debt at graduation
• Number of students receiving institutional grants
• Average grants by income bracket

Section I: Class size and faculty

Useful data: The class size distribution is more useful than averages — it tells you what percentage of your classes will be small vs. large.

• Distribution of class sizes
• Faculty-to-student ratio
• Percentage of classes taught by full-time faculty
• Section sizes for laboratories and discussion sections

Section B: Graduation rates

Important data: Strong graduation rates indicate a school where students are supported through to completion.

• Six-year graduation rate
• Four-year graduation rate
• Retention rate (first to second year)
• Demographic breakdowns

How to use the CDS in research

A useful workflow: 1. Pick three schools you're researching. 2. Find each school's most recent CDS. 3. Compare key sections across schools (Section H, I, C). 4. Note differences that surprise you. 5. Use specific data points in conversations and decisions. This research takes about 30–45 minutes per school. The depth of insight is significant.

What the CDS doesn't tell you

The CDS is comprehensive but not complete. It misses: For these, you need other sources (student newspapers, Reddit, conversations, visits).

• Daily life on campus
• Specific program strengths within majors
• Recent campus issues or changes
• The "feel" of a school
• Faculty specialties
• Specific outcomes by major

Common misreadings

A few patterns to avoid:

• Confusing acceptance rate with quality. Section C tells you selectivity, not quality.
• Trusting "average aid" without breaking by income. Look at aid by family income bracket if available.
• Misreading class size distribution. A school with "60% of classes under 20 students" can still have many large lectures in your major.
• Comparing different years. Stick to recent or matched years across schools.

A specific use case

If you're considering whether to apply ED to a school: Together, these data points help you decide whether ED makes sense.

• Section C tells you the ED admit rate (vs. regular decision rate)
• Section H tells you the school's aid generosity
• Section I tells you class size patterns

Schools that don't publish CDSs

Most accredited four-year schools publish CDSs. Some don't, including: Absence of a CDS isn't necessarily a red flag, but it means you'll need to find similar data elsewhere.

• Schools that publish similar data in their own format
• Some smaller or specialized schools
• Schools that only publish to specific organizations

A note on year-over-year changes

The CDS is updated annually. Some metrics change significantly year to year (acceptance rates, particularly during 2020–2023). Use recent data and note trends.

What to do this week

For each school you're considering: 1. Find their most recent CDS 2. Read Sections C, H, and I carefully 3. Note key data points 4. Compare across schools 5. Use what you learn to inform your list and decisions This is one of the highest-value hours you can spend in your search.

Quick reference: Most useful CDS sections

Practical checklist: Using the CDS effectively

How CampusPin helps strengthen this search

CampusPin helps students turn broad college interest into a stronger search workflow by combining filters, richer school profiles, and a more visible shortlist process. That makes it easier to remove weak-fit schools before the list becomes emotionally crowded.

• Use filters to narrow by the constraints that matter most first.
• Review profiles to understand why a school still deserves attention.
• Keep the shortlist small enough that every school can be defended clearly.