Estimating sensitivity and specificity of a diagnostic test

Estimate the sensitivity/specificity and other measures of the accuracy of a binary diagnostic test (or a quantitative test at a specific decision threshold).

1. Select a cell in the dataset.
2. On the Analyse-it ribbon tab, in the Statistical Analyses group, click Diagnostic, and then click Binary (Sensitivity / Specificity).
   The analysis task pane opens.
3. In the True state drop-down list, select the true condition variable.
4. In the Positive event drop-down list, select the state that indicates the presence of the condition/event of interest.
5. In the Y drop-down list(s), select the test variable(s).
6. If the Y variable is binary, in the Positive event drop-down list, select the state that indicates a positive test.
7. If the Y variable is quantitative, click the menu next to the variable and select Cut-off, and then enter the criteria to recode the variable into a binary variable.
8. If the data are in frequency form, in the Frequency drop-down list, select the frequency count variable.
9. Optional: Select the appropriate TP/TN/FP/FN, Sensitivity / Specificity, Likelihood ratio, Predictive value check boxes.
10. Click Calculate.