Contrast Tests of Interaction Hypotheses

  title={Contrast Tests of Interaction Hypotheses},
  author={Robert P. Abelson and D{\'e}borah and Prentice},
This article argues for the use of contrasts to test a priori interaction hypotheses in 2-way analysis of variance designs. It focuses on 3 underused types of interaction contrast tests: a "matching" pattern for cognate levels of row and column factors; the "qualitative quadratic," for monotonic profiles of means in the same direction but with opposed concavities; and a "differential curvilinearity" test for differences in the curvature of two profiles with the same direction of concavity. The… CONTINUE READING