RPTS 336 - (11) Reliability and validity (student version)

RPTS 336 - (11) Reliability and validity (student version)...

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Reliability and Validity Woosnam October 7, 2011
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Reliability and validity are  important… …just ask this guy http://www.youtube.com/watch?v=flP02rznSLE
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Reliability and validity _Reliability_ How accurate ( ? ? )or consistent ? ? is the measure? Would two people understand a question in the same way? Would the same person give the same answers under similar circumstances? _Validity_ Does the concept measure what it is intended to measure? Does the measure actually reflect the concept? Do the findings reflect the opinions, attitudes, and behaviors of the target population?
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_____vaild and reliable_____ ___Invalid and unreliable____ ____Invalid but reliable_____
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Levels of reliability example: person’s weight HIGH LOW Estimate( ? ? ) on the part of the subject Estimate on the part of the observer Old bathroom scale Industrial scale
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Reliability Reliability is the ____Unclear____ of your measurement, or the degree to which an instrument measures the same way each time it is used under the same condition with the same subjects. In short, it is the repeatability of your measurement. A measure is considered reliable if a person's score on the same test given twice is similar. It is important to remember that reliability is not measured, it is estimated .
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Suppose that you have bathroom weight scales and these scales are broken. One person weighs you with these scales and obtains a result.
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This note was uploaded on 12/07/2011 for the course RPTS 336 taught by Professor Woo during the Spring '11 term at West Texas A&M University.

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RPTS 336 - (11) Reliability and validity (student version)...

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