DNB 2020 Dec Previous Question Papers-(Diplomate of National Board) Under NBE
JIPMER Potential topics
Dr. V. Murugan
Crohnbach's Alpha
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- used to estimate reliability or internal consistency of a questionnaire
- Values ranges- 0-1
Kappa statistics
- Used to measure the inter observer agreement(eg- X ray by two observers)
- Values >0.75- excellent agreement
- Values 0.4-0.75- intermediate to good agreement
- <0.4- poor agreement
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Likelihood ratio (LR)
- measures diagnostic accuracy
- Positive LR sensitivity 1- specificity
- Negative LR 1- sensitivity specificity
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Receiver operating characteristic (ROC) curve
- Graphical display of validity of test
- Plotted between sensitivity and 1- specificity
- Maximum area under the curve is 1
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