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PSYC 201 – NOVEMBER 20TH.docx

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PSYC 201
Stephen Lindsay

PSYC 201 – NOVEMBER 20 , 2013 TH 2.c 3. a Look at the marginal means:  Unequal means  Main effect present  Equal means  No main effect  Non parallel lines  Interaction present  Parallel lines  No interaction Simple Effect Tests When a significant interaction is obtained, one performs “simple effect” tests (aka post hoc comparisons) to assess effect of one IV separately at each level of the other IV. This involves conducting two t-tests or one-way ANOVAs: One test to see if IV A has an effect at level 1 of IV B, the other to see if IV A has an effect at level 2 of IV B (or one to see if IV B has an effect at level 1 of IV A and another to see if IV B has en affect at level 2 of IV A). Summary A two-way factorial design is an experiment in which two IVs are “orthogonally” crossed. The simplest two-way design is a 2x2: each of the two IVs has two levels; orthogonally crossing them creates 4 conditions. In a 2x2 between-subjects --- see slide A 2x2 factorial design tests for three effects: 1. Main effect of IV A 2. Main effect of IV B 3. Interactive effect of IV A and B Interactions can take a variety of forms. Significant interactions are interpreted with simple effect tests (post-hoc comparisons) to compare the levels of the one IV while holding the other constant. Factorial Designs with Subject Variables
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