# 3600pp5 - Chapter 5: Measurement Concepts Measurement of...

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Chapter 5: Measurement Concepts Measurement of Variables Reliability Measure stability Speedometer as an index of reliability Can a measure be perfectly reliable? Composed of two components: 1. True Score 2. Measurement Error X = T + E Test-Retest Reliability Give measure to participants (T1) Give measure again to same participants (T2) Correlate the two scores Correlations range from .00 to 1.00 Alternate Forms Reliability Combats memory problems of Test-Retest Develop two equivalent measures Give one at T1 Give the other at T2

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Split-Half Reliability Correlation of score on 1st half of the measure with that of the second PROBLEM: Correlation is based on measures that are half as long as the original Double size does not double reliability Increasing size = diminished returns Odd-Even Reliability Correlation of odd numbers on the test with the even numbers Alpha Reliability Internal consistency approach: Cronbach’s alpha ( α ) Do all items measure the same thing? Studies the relationship among items
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## This note was uploaded on 11/16/2011 for the course PSYCH 3600 taught by Professor Whatley during the Fall '11 term at Valdosta State University .

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3600pp5 - Chapter 5: Measurement Concepts Measurement of...

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