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)

A method is described for increasing residual degrees of freedom in a community experiment without substantially increasing cost or difficulty by dividing experimental subunits into batches. Theoretical advantages of batch sampling are described and illustrated with data from the Pawtucket Heart Health Program. (SLD)

Proceedings are presented from a meeting designed to encourage and assist university-based researchers and public policy-makers in the formation of meaningful, long-term collaborations that would ultimately increase chances of competing successfully for research grants on the efficacy of services and systems of care for children and adolescents…

The National School Health Services Program Evaluation machine-readable data files (MRDF) are the result of a series of surveys conducted during the 1979-1980, 1980-1981, and 1981-1982 school years. The purpose of these surveys was to evaluate a demonstration health service program sponsored by the Robert Wood Johnson Foundation. The principal…