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Chapter 5

Chapter 5 Notes

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Anna Nagy

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Chapter 5: Measurement Concepts RELIABILITY OF MEASURES Reliability: consistencystability of measure o i.e. use same measures and get same results Formal definition of reliability: o true score: real score on var o measurement error: amt of variability e.g. IQ tests on 2 ppl both avg 100, but low reliability measure will have larger fluctuation (variabilitymeasurement error) achieving reliability o careful recording, asking of questions, procedures and using multiple measures correlation coefficient can be used to assess reliability Pearson product-moment correlation coefficient (r) o Ranges from -1.00 to +1.00 o Absolute value is strength of relationship o 0 Is no rel o Aka reliability coefficient Two reliable scores should have high correlation for reliability Different types of reliability o Test-Retest Reliability o Internal Consistency Reliability o Interrater Reliability Test-Retest Reliability Test re-test reliability: assessed by measuring twice at diff times www.notesolution.com
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