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title[*]contributor[author]contributor[advisor]keywords[*]date[issued] publisher citationsidentifier[uri]identifier[doi]abstractrelation[journal]relation[volume]relation[no]relation[page]VA Note on the Reliability Coefficients for Item Response Model-Based Ability Estimates@1Areliability coefficient;
ability estimates;
item response theory;2012-01/SPRINGER, 233 SPRING ST, NEW YORK, NY 10013 USA(PSYCHOMETRIKA, : 77, 8: 1, t: 153-162|http://search.proquest.com/docview/912432852?accountid=11283;
https://link.springer.com/article/10.1007%2Fs11336-011-9238-0;10.1007/s11336-011-9238-0Assuming item parameters on a test are known constants, the reliability coefficient for item response theory (IRT) ability estimates is defined for a population of examinees in two different ways: as (a) the product-moment correlation between ability estimates on two parallel forms of a test and (b) the squared correlation between the true abilities and estimates. Due to the bias of IRT ability estimates, the parallel-forms reliability coefficient is not generally equal to the squared-correlation reliability coefficient. It is shown algebraically that the parallel-forms reliability coefficient is expected to be greater than the squared-correlation reliability coefficient, but the difference would be negligible in a practical sense.
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