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روان شناسی و مشاوره::
همبستگی دورشته ای
First, classical test theory values of performance of the entire examinee population, including p-values (difficulty) and biserial correlation values (discrimination), were calculated.
The biserial correlation (????????)
For some examinations, the point biserial value is reported as the measure of item discrimination as opposed to biserial correlation.
While both statistics measure the correlation between two variables, the biserial correlation is recommended when one of the variables is artificially dichotomous (e.g.
Examination Form Item Performance, N = 50 Mean p-value (SD) 0.849 (0.131) Mean biserial correlation value (SD)
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