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Barnow, Burt S.; And Others – 1980
Selectivity bias arises in program evaluation when the treatment or control status of the subjects is related to unmeasured characteristics that themselves are related to the program outcome under study. This situation has the potential to lead to an incorrect estimation of the treatment effect when assignment to treatment and control groups is…
Descriptors: Control Groups, Evaluation Methods, Experimental Groups, Models

Alcabes, Abraham; Jones, James A. – Social Work, 1985
Presents an analytical model for differentiating true clients from applicants in clinical social work practice. Society and the professions, and individuals and primary groups are discussed as structural determinants of clienthood. Social work practice is described as consisting of two major divisions: socialization and treatment. (NRB)
Descriptors: Client Characteristics (Human Services), Counseling Effectiveness, Experimental Groups, Models