PSY 302 Lecture Notes - Lecture 11: Factor Analysis, Regression Analysis, Psych
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Save time by addressing multiple things in one study. Factorial designs: each level of one iv is combined with each level of the others for every possible combination, 2 x 2 most common. Increasing the number of levels of an iv. Provides more information about the relationship than a two level design. Comparing two or more groups: i. e. How dogs, cats and birds, as opposed to dogs alone, have beneficial effects on nursing home residents. All of the ivs manipulated between subjects: within-subjects factorial design. Usually considered experiments as long as there is at least one manipulated. Causal conclusions can only be made about the manipulated iv. Main effect: statistical relationship between one iv and a dv averaging across the levels of the other iv, for each iv one main effect to consider, independent of each other. Interaction: effect of one iv depends on the level of another, the differences are different.
