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Perceptual measures of items (survey questions) are adopted and adapted from Parthasarathy and Bhattacherjee [57].
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We demonstrate that the addition of illustrations within undergraduate histology Multiple Choice Question stems has no overall influence on item difficulty, or measures of item discrimination.
We next analysed both measures of item discrimination, calculating the mean and standard deviations for these parameters, and performing comparison of means between the two groups using the Independent samples t-test (2-tailed).
Nevertheless, in the round, the QOF is a broadly based and objective measure of items recommended by both the profession and patients.
The Traumatic episodes during the genocide period was a summary measure of items of traumatic episodes from the revised versions of Harvard Trauma Questionnaire [ 26] related to the genocide exposure, dichotomized into "any" as opposed to "no traumatic experience" [ 27].
The outfit is not an information-weighted measure of item fit, so it is more sensitive to responses of people that are far from the difficulty of the item.
The infit mean-square is an information-weighted measure of item fit, in which is more sensitive to the pattern of responses that are close to the item difficulty discrepancies.
The difference was one measure of item discrimination.
Mean inter-item correlations were used as a measure of item homogeneity.
The point biserial correlation (RPB) is also a measure of item discrimination, and is the correlation between the item score and the total test score [ 15].
Inter scale correlations were used to measure discreminant validity which was a measure of item own scale correlation in relation to other scales.
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