I used frosh class stats (HS GPA and test scores) to find similar levels of selectivity. Even though admit rates may be similar, CPSLO, UCI > SDSU, UCR > CPP, UCM in actual admissions selectivity. Admit rates do not really tell selectivity, since http://colleges.usnews.rankingsandreviews.com/best-colleges/rankings/lowest-acceptance-rate/page+3 lists some not-very-selective schools with low admit rates because they get lots of academically weak applicants.