This codebook describes the contents of a data file from the Health Insurance Experiment (HIE), a large social experiment conducted by The RAND Corporation from 1974 to 1982 under a grant from the U.S. Department of Health and Human Services. The health maintenance organization (HMO) and Seattle fee-for-service (FFS) annual expenditures and visit counts file contains the annual sums of imputed expenditures and types of visits for Seattle FFS participants and participants enrolled in Group Health Cooperative of Puget Sound, a large prepaid group practice in Seattle.
