The study incorporated responses from 153,015 first-time, full-time students beginning their studies at 227 four-year colleges and universities of varying levels of selectivity and type in the U.S. The data was statistically weighted to reflect the approximately 1.6 million first-time, full-time students entering 1,583 four-year colleges and universities across the country in 2014. Since 1966, the first year the survey was conducted, more than 15 million students at 1,900 colleges and universities have completed CIRP surveys. The CIRP Freshman Survey is the largest and longest-running survey of American college students, and the 2015 administration will mark its 50th year.