Lecture 10-19

Lecture 10-19 - October 19, 2004 Validity of Measurement...

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October 19, 2004 Validity of Measurement Are you measuring what you claim to be measuring? Face Validity The measure looks good “on the face of it” Content Validity The measure captured the full content domain of the concept being studied Not just capturing a part but all the possibilities included in your conceptual defn Ex: Tolerance for having adult book stores in town? Not at all/Very much Face value sounds good Question the word validity , ask more questions like location of the store; ask more than one question Predictive (Criterion- related) Validity The measure is shown to predict some relevant concept Ex: SAT college GPA (if this is proven true then it have predictive validity) Relationship between validity and reliability Can a measure be reliable but not valid? Yes; can be a good measure but not be valid Ex: height can be a reliable measure but not valid for course grade, etc. Can a measure be valid but not reliable? No; have to have reliability before validity If not measuring consistence, you can’t measure validity In order to measure a concept right, you can’t not have reliability with validity Sampling (a sub-set of the population you’re studying)
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Lecture 10-19 - October 19, 2004 Validity of Measurement...

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