Notes14

Notes14 - Reliability and Validity Understanding the...

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1 Reliability and Validity Understanding the Meaning of Study Results Evaluation of Studies • Reliability refers to error of measurement. The more error, the poorer the measures. • Validity refers the quality of inference based on the study. • Internal validity concerns whether the intended IV cause a change in the DV, or something else is responsible. • External validity is about generalizing the results to other situations. Reliability (1) • Aka consistency, repeatability. 3 Major forms: • 1. Test-retest. Same measure, same people, later time. Compute the correlation. • 2. Alternate forms. Two measures, same time, same people. Compute the correlation.
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2 Reliability (2) • 3. Internal Consistency. 1 measure, 1 time, 1 set of people. Cheapest, most efficient method. Considers items as mini-tests. Only works with multi-item measures. • Ex1: Split half – cut test in two. Compute correlation. Correct to whole with Spearman Brown Prophecy Formula. Many halves. • Ex2:
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Notes14 - Reliability and Validity Understanding the...

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