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Peer reviewedSchafer, William D. – Measurement and Evaluation in Counseling and Development, 1992
Notes that presence of heterogeneous regression slopes in an analysis of covariance design is equivalent to presence of interaction in randomized-blocks design. Describes modification of the usual graphical representation of heterogeneous regressions that can aid in interpreting significant regions for regression surfaces. (NB)
Descriptors: Analysis of Covariance, Data Interpretation, Graphs, Regression (Statistics)
Peer reviewedReynolds, Kim D.; West, Stephen G. – Evaluation Review, 1987
Using data from a sales campaign for the Arizona State lottery, a multiplist strategy of program evaluation is analyzed. Several complementary designs are used within the strategy to help remove threats to internal validity associated with the nonequivalent control group design. (SLD)
Descriptors: Analysis of Covariance, Case Studies, Control Groups, Data Interpretation
