The Reliability of Differences Scores in Populations and Samples
This study was an investigation of the relation between the reliability of difference scores, considered as a parameter characterizing a population of examinees, and the reliability estimates obtained from random samples from the population. The parameters in familiar equations for the reliability o...
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| Veröffentlicht in: | Journal of educational measurement 2009-04, Vol.46 (1), p.19-42 |
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| container_title | Journal of educational measurement |
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| creator | Zimmerman, Donald W. |
| description | This study was an investigation of the relation between the reliability of difference scores, considered as a parameter characterizing a population of examinees, and the reliability estimates obtained from random samples from the population. The parameters in familiar equations for the reliability of difference scores were redefined in such a way that determinants of reliability in both populations and samples become more transparent. Computer simulation was used to find sample values and to plot frequency distributions of various correlations and variance ratios relevant to the reliability of differences. The shape of frequency distributions resulting from the simulations and the means and standard deviations of these distributions reveal the extent to which reliability estimates based on sample data can be expected to meaningfully represent population reliability. |
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The shape of frequency distributions resulting from the simulations and the means and standard deviations of these distributions reveal the extent to which reliability estimates based on sample data can be expected to meaningfully represent population reliability.</description><subject>Correlations</subject><subject>Error rates</subject><subject>Estimate reliability</subject><subject>Frequency distribution</subject><subject>Population estimates</subject><subject>Population parameters</subject><subject>Ratios</subject><subject>Sampling distributions</subject><subject>Standard deviation</subject><subject>Test theory</subject><issn>0022-0655</issn><issn>1745-3984</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2009</creationdate><recordtype>article</recordtype><sourceid/><recordid>eNqFybsKwjAUANAgCtbHJwj3BwpJ2rR2E3zgKLZ7iTXBlDQJuXXo3-vg7nSGMyMJK3ORZtU-n5OEUs5TWgixJCvEnlImSsEScmheCu7KGvkw1owTeA0no7WKynUKoe58_GIc3Hx4Wzka7xCke0Ith2AVbshCS4tq-3NNdpdzc7ymPY4-tiGaQcap5TQvWMV49u8_QbY1rw</recordid><startdate>20090401</startdate><enddate>20090401</enddate><creator>Zimmerman, Donald W.</creator><general>Wiley Subscription Services</general><scope/></search><sort><creationdate>20090401</creationdate><title>The Reliability of Differences Scores in Populations and Samples</title><author>Zimmerman, Donald W.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-jstor_primary_204619123</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2009</creationdate><topic>Correlations</topic><topic>Error rates</topic><topic>Estimate reliability</topic><topic>Frequency distribution</topic><topic>Population estimates</topic><topic>Population parameters</topic><topic>Ratios</topic><topic>Sampling distributions</topic><topic>Standard deviation</topic><topic>Test theory</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Zimmerman, Donald W.</creatorcontrib><jtitle>Journal of educational measurement</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Zimmerman, Donald W.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>The Reliability of Differences Scores in Populations and Samples</atitle><jtitle>Journal of educational measurement</jtitle><date>2009-04-01</date><risdate>2009</risdate><volume>46</volume><issue>1</issue><spage>19</spage><epage>42</epage><pages>19-42</pages><issn>0022-0655</issn><eissn>1745-3984</eissn><abstract>This study was an investigation of the relation between the reliability of difference scores, considered as a parameter characterizing a population of examinees, and the reliability estimates obtained from random samples from the population. 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| identifier | ISSN: 0022-0655 |
| ispartof | Journal of educational measurement, 2009-04, Vol.46 (1), p.19-42 |
| issn | 0022-0655 1745-3984 |
| language | eng |
| recordid | cdi_jstor_primary_20461912 |
| source | JSTOR Archive Collection A-Z Listing; EBSCOhost Education Source; Wiley Online Library All Journals |
| subjects | Correlations Error rates Estimate reliability Frequency distribution Population estimates Population parameters Ratios Sampling distributions Standard deviation Test theory |
| title | The Reliability of Differences Scores in Populations and Samples |
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