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Simple Validity Statistics for Teachers

My primary area of interest (besides statistics) is personality psychology. If there’s one thing you’ll notice about personality psychologists, it’s that we’re kind of obsessed with questionnaire measurement – and usually rely on some pretty complicated statistics to really be satisfied that a questionnaire is suitable for our purposes. Really though, we’re usually interested in two things: Are the questionnaires reliable? That is, does the questionnaire produce consistent results under similar conditions? Are the measurements valid? That is, does the questionnaire...