Notes that family researchers can examine extent of self-selection bias in samples by using range of "plausibly correlated characteristics" such as marriage and divorce public records. Provides extensive case example of analyses and discusses compensation techniques of weighting and hazard rate models. (Author/NB)

Describes the evolution of national educational assessment in the United States, its present stage of development, methodological and reporting problems, and approaches applicable to assessment data. Examines how proposed approaches can be applied in the California Assessment Program and in the National Assessment of Educational Progress. (MJL)

Evaluations involving nonrandom assignment to treatment or control groups are vulnerable to an accidental or intentional confounding of a selection effect with the treatment effect. Two techniques, discriminant analysis and base expectancy analysis, permit separate estimation of the selection and treatment effects in the final results. (Author/CTM)