The validity of various reliability-corrected procedures for adjusting for initial differences between groups in uncontrolled studies is established for subjects exhibiting linear fan-spread growth. The results are then extended to a non-linear model of growth.
Get full access to this article
View all access options for this article.
References
1.
Bryk, A. S. and Weisberg, H. I.Use of nonequivalent control group design when subjects are growing. Psychological Bulletin, 1977, 84, 950-962.
2.
Campbell, D. T. and Boruch, R. F.Making the case for randomized assignment to treatments by considering the alternatives: Six ways in which quasi-experimental evaluations tend to underestimate effects. In C. A. Bennett & A. A. Lumsdaine (Eds.), Evaluation and experiment. New York: Academic Press, 1975.
3.
Kenny, D. A.A quasi-experimental approach to assessing treatment effects in the nonequivalent control group design . Psychological Bulletin, 1975, 82, 345-362.
4.
Overall, J. E.A survey of issues related to the analysis of observational data in longitudinal research. In J. S. Strauss, H. M. Babigian, & M. Roff (Eds.), The origins and course of psychopathology. New York: Plenum Publishing, 1977.
5.
Porter, A. C. and Chibucos, T. R.Selecting analysis strategies. In G. D. Borich (Ed.), Evaluating educational programs and products. Englewood Cliffs, N. J.: Educational Technology Publications, 1974.
6.
Reichardt, C. S.The statistical analysis of data from nonequivalent group designs. In T. D. Cook & D. T. Campbell (Eds.), Quasiexperimentation. Chicago: Rand McNally, 1979.
