Two Approaches to Estimation of Classification Accuracy Rate Under Item Response Theory Quinn N. Lathrop…

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Introducation Classification consistency is the degree to which examinees would be classified into the same performance categories over parallel replications of the same assessment (Lee, 2010). classification accuracy refers to the extent to which actual classifications using observed cut scores agree with “true” classifications based on known true cut scores.(Lee, 2010). Distribution method: Estimating true score distribution + the observed score distribution Individual/person method: Each individual’s classification status –true CA increases with test length –decreases when the cut score is located near the mean of the examinee distribution