The Current Population Survey (CPS) Protected Identification Key (PIK) Crosswalks are used to link CPS March Supplement microdata files to other microdata files with a PIK variable.
The CPS School Enrollment Supplement is a national survey conducted to obtain information about enrollment in formal schools, full-time and part-time status, and level of education. It is also used to obtain information about enrollment in business, vocational, technical, and correspondence courses. It is a proxy response survey that is sponsored by the National Center for Education Statistics (NCES), Bureau of Labor Statistics (BLS) and the United States Census Bureau.
