Retention is the number of students who remain enrolled in a school over a period of time.  This is a way to get a sense of how satisfied students are with their school experience and whether they have the support they need to succeed in college. Of all full-time freshmen who start at TCU, about 91% return for their second year.  The average six-year graduation rate for US colleges and universities is 61% for public schools and 67% for private non-profit schools.