What is 12-month enrollment (E12) ?
12-month enrollment (E12) meaning These data were collected in the Enrollment component prior to the 2007 IPEDS collection. Data are collected for the entire 12-month academic year, while enrollment data collected in the Fall Enrollment component are fall data. Institutions report an unduplicated head count for the total number of students by gender, race/ethnicity, and level (undergraduate, graduate, first-professional) enrolled throughout the reporting period. Students included are those enrolled in any courses leading to a degree or other formal award, as well as those enrolled in courses that are part of a terminal vocational or occupational program. Institutions also report the total instructional activity for the same 12-month period for both undergraduate and graduate programs. Instructional activity data are reported in units of contact hours (sometimes referred to as clock hours) or credit hours.
reference: IPEDS Data Collectrion System – Glossary