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Issues in the Analysis of Selectivity Bias. Discussion Papers. Revised.

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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

Following Through on Follow Through.

Edwards, Roger H.; Bridewell, Joy L. – 1979

Possible causes for the discrepancy between the ABT report on the national Project Follow Through and the Saint Louis, Missouri program were discussed: (1) ABT data were positively biased because of non-random, differential attrition from the program and control groups; (2) positive ABT data were due to use of a particular cohort group; or (3)…

Descriptors: Achievement Gains, Affective Objectives, Compensatory Education, Elementary Education