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Peer reviewedHumphreys, Keith; And Others – Evaluation and Program Planning, 1996
The self-selection problem in program evaluation is explored, and two ways of addressing it, covariate control approaches and two-stage sample selection models, are described. A longitudinal study of the effects of participation in Alcoholics Anonymous illustrates both approaches and shows the advantages of the two-step procedure. (SLD)
Descriptors: Evaluation Methods, Longitudinal Studies, Mental Health Programs, Program Evaluation
Peer reviewedCiarlo, James A.; And Others – Evaluation and Program Planning, 1992
A stratified probability sample of 4,745 adults in Colorado was surveyed to determine the need for alcohol, drug abuse, and mental health services. Findings that variation in need prevalence across 48 subareas of the state substantially challenge the assumptions of a uniform rate of need in a state. (SLD)
Descriptors: Adults, Alcohol Abuse, Drug Rehabilitation, Geographic Regions
