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Published byLea Delany Modified about 1 year ago

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MEQ Analysis

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Outline Validity Validity Reliability Reliability Difficulty Index Difficulty Index Power of Discrimination Power of Discrimination

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Validity “evidence present to support or refute the meaning assigned to assessment results” face validity face validity content validity content validity criterion-related validity criterion-related validity construct validity construct validity

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Face Validity high face validity high face validity seemed valid (only) ~ person knee jerk & nervous system knee jerk & nervous system for doctor => high face validity for lay people => low face validity MEQ => high face validity MEQ => high face validity

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Content Validity ~ sample & population ~ sample & population MCQ => high content validity MCQ => high content validity MEQ => low content validity MEQ => low content validity

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Validity “evidence present to support or refute the meaning assigned to assessment results” face validity face validity content validity content validity criterion-related validity criterion-related validity construct validity construct validity - don’t need the score - before using the test - score needed - after using the test

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Criterion-Related Validity Predictive validity Predictive validity MEQ score & close observation score of real practice at ER Concurrent Validity Concurrent Validity MEQ score & VIVA score in the same topic Statistic = correlation coefficient Statistic = correlation coefficient

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Construct Validity based on theory based on theory communication skill ~ leadership correlation OSCE : communication VS questionnaire : leadership correlation OSCE : communication VS questionnaire : leadership good ethics ~ beloved doctor MEQ : medical ethics VS questionnaire : beloved doctor? MEQ : medical ethics VS questionnaire : beloved doctor?

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Reliability stability stability internal consistency internal consistency equivalent equivalent

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Stability test-retest reliability test-retest reliability parallel form reliability parallel form reliability intra-rater reliability intra-rater reliability ~ scoring key statistics : correlation coeff. statistics : correlation coeff. 0-1

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Internal Consistency [homogeneity] [homogeneity] item - item correlation item - item correlation item - total correlation item - total correlation split half correlation split half correlation

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Item-Item Correlation each item each item Dichotomous Phi Correlation Phi Correlation Interval Pearson’s Product Moment Correlation Pearson’s Product Moment Correlation whole test whole test Mean of...

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Item-Total Correlation each item each item Dichotomous Point Biserial Correlation Point Biserial Correlation Interval Pearson’s Product Moment Correlation Pearson’s Product Moment Correlation whole test whole test Mean of...

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Spilt Half Reliability Dichotomous Dichotomous Kuder-Richardson 20 (KR 20) Interval Interval Kuder-Richardson 21 (KR 21) Cronbach’s alpha coefficient

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Equivalent parallel item on alternate form reliability parallel item on alternate form reliability inter-rater reliability inter-rater reliability agreement kappa

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Difficulty Index [p] [p] (mean H + mean L)/2(full score) (mean H + mean L)/2(full score) p = 1 => very easy p = 1 => very easy p = 0 => very difficult p = 0 => very difficult expecting p = expecting p = must => 0.7 should => 0.5

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Power of Discrimination [r] [r] (mean H - mean L)/(full score) (mean H - mean L)/(full score) > 0.40 => very good item > 0.40 => very good item => good item => good item => borderline => borderline poor item poor item

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Conclusion Validity Validity Reliability Reliability Difficulty Index Difficulty Index Power of Discrimination Power of Discrimination

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