Step one: check that they are the same kind of institution
A two-year public community college and a four-year private university are not alternatives to each other for most students, and comparing their graduation rates is meaningless — they serve different populations with different goals. Before comparing anything, check that the two share a level (four-year, two-year) and, ideally, a control type (public, private nonprofit, private for-profit).
- Different levels mean different normal completion times, so graduation rates are not comparable.
- Public and private institutions report net price differently, because one is subsidised by a state and the other discounts its own published price.
- Open-admission colleges and highly selective ones have completely different admission and completion profiles.
Step two: compare costs on the same basis
The fairest cost comparison is net price within the same income band, for the same residency status. Comparing one college’s in-state net price against another’s out-of-state price will tell you almost nothing useful.
Step three: handle the blanks honestly
Two colleges will rarely report the same set of figures. When one has an earnings figure and the other does not, the absence is not evidence of anything. Compare only the measures both report, and note how many institutions each figure is based on.
Step four: decide what actually matters to you
A comparison is only useful if you have decided in advance which differences would change your decision. Otherwise you will end up optimising whichever number happens to be printed largest.
- If cost is the binding constraint, compare net price in your income band first, and treat outcomes as secondary.
- If a particular programme matters, compare at programme level where the data exists — institutional averages can hide a weak department or a strong one.
- If completion is the concern, look at the graduation rate alongside the size of the part-time population, which the official rate excludes.
- If earnings matter, compare against the high-school-graduate benchmark on the page rather than against a salary you have in mind.
What a comparison cannot settle
Federal data describes institutions in aggregate. It cannot tell you whether you will finish, whether the teaching is good, whether the programme suits you, or what your own aid offer will be. Use it to reduce a long list to a short one, then do the part that data cannot do: visit, talk to current students, and ask the financial aid office for a real number.