11 - 2/11/2011 Test Re-test Reliability Same test taken on...

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2/11/2011 Test Re-test Reliability Same test taken on different days Parallel forms reliability Used to measure the equivalence of two forms of the same measure Form A and Form B Do both measure in the same way? Internal Consistency Reliability Whether the items within a test measure the same thing o Are items designed to measure depression scored similarly o Do people answer the same to I like being outside and I enjoy the wonders of nature? Measuring Internal Consistency Cronbach’s alpha (n/n-1)(Variance in scores- sum variance of each item/variance in score) Closer it is to 1= more internal consistency Interrater reliability Tells you how much two rater agree on a judgment of an outcome o Used when measures involved subjectivity o Rating of aggressive behavior The case of Harvard Professor Marc Hauser o Rated videos of tamarin monkeys noticing themselves in a mirror o Engaging in rule-like behavior o His ratings differed remarkably from his students’
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11 - 2/11/2011 Test Re-test Reliability Same test taken on...

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