5 - measurement concepts

5 - measurement concepts - Reliability of Measures 18:52...

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Reliability of Measures 18:52 Reliability: The consistency or stability of a measure of behavior  A reliably measure of a psychological variable will yield the same result each time  you administer the test to the same person  A reliable measure does not fluctuate from one reading to the next  Any measure that you make can be thought of as comprising two components True score: The real score on the variable Measurement error: An unreliable measure that does not provide an accurate  indication  Reliability is most likely to be achieved when researchers use careful  measurement procedures  Reliability can be increased by making multiple measures Reliability is increased when the number of items increases We can assess the stability of measures using correlation coefficients Pearson product-moment correlation coefficient: Can range from 0.00 to  +1.00 and 0.00 to -1.00 o The positive and negative signs provide information about the direction of  the relationship  Test-Retest Reliability Assessed by measuring the same individuals at two points in time  The correlation might be artificially high because the individuals remember  how they responded the first time  o Alternate forms reliability involves administering two different forms of the  same test of the same individuals at two points in time  Some variables may be expected to change from one test period to the next  Internal Consistency Reliability The assessment of reliability using responses at only one point in time o Because all items measure the same variable, they should yield similar or  consistent results
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This note was uploaded on 11/16/2010 for the course EDHD 460 taught by Professor Staff during the Spring '08 term at Maryland.

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5 - measurement concepts - Reliability of Measures 18:52...

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