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MEQ Analysis. Outline Validity Validity Reliability Reliability Difficulty Index Difficulty Index Power of Discrimination Power of Discrimination.

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Presentation on theme: "MEQ Analysis. Outline Validity Validity Reliability Reliability Difficulty Index Difficulty Index Power of Discrimination Power of Discrimination."— Presentation transcript:

1 MEQ Analysis

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

3 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

4 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

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

6 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

7 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

8 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?

9 Reliability stability stability internal consistency internal consistency equivalent equivalent

10 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

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

12 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...

13 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...

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

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

16 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

17 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

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


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