NCES has changed the types of institution reported over this time series. From 1995-1998, NCES reported two types of research or doctoral universities:
From 2000-2006, NCES reported two types of research or doctoral universities:
Beginning in 2007, NCES began reporting three research or doctoral categories:
In addition to the research or doctoral categories, NCES provides these definitions for the remaining categories shown:
Because research and doctoral category definitions have changed over time, this database maintains the original NCES definitions. Therefore, data are not reported in all years:
In each year, however, the sum total of research and doctoral universities are reported.
Don't show me this again.