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.
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