CAS PS 326 Study Guide - Final Guide: Internal Validity, Dependent And Independent Variables, Railways Act 1921
6 May 2020
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Experimental designs: causal statements. (be more certain that something is causal if you see an effect), best design to internal validity. (extent to which a causes b), third variables and other factors decrease internal validity and the results. Can"t detect variation in floor and ceiling effect, because everyone is performing the same: factorial design: looking at more than one iv (factors). Independent variables are factors: 2x2, 3x2 (each number represents an independent variable), number of groups represents the number of levels, usually on categorical iv"s (but not always), ex: 2 x 2 (two iv"s then two measures). Gender (male, female) major (science, neuroscience) time presence (high tp, low tp, These factors (2 x 2 x 3) all affect performance. Code reverse score: transform-> recode into different variables, click variables you want reverse coded into the box, name the variable (ex: pss2r).
