For employed persons, data include number of hours and weeks worked. Beyond labor force activity, nearly fifty other income variables are included. The survey universe is the resident population of the U.S., excluding persons living in institutions and military barracks. One record was assigned to each person who was a member of an interviewed household at any time during the overall survey period of October 1987 to December 1989. The survey sample was divided into four nearly equal groups or rotations.
Geographic coverage is the United States.
State codes are identified for participants from 41 states. Participants from the nine remaining states are identified in groups for purposes of confidentiality. Bureau of the Census.