psi: Predictive Summary Index Calculation From a 2x2 Table
Description
Calculates the Predictive Summary Index for data from a 2x2 table
Usage
psi(Cell1, Cell2, Cell3, Cell4)
Value
Predictive Summary Index
Arguments
Cell1
Value for cases with a positive test
Cell2
Value for controls with a positive test
Cell3
Value for cases with a negative test
Cell4
Value for controls with a negative test
Author
Mike Malek-Ahmadi
References
1. Linn S, Grunau PD. New patient-oriented summary measure of net total gain in certainty for dichotomous diagnostic tests. Epidemiol Perspect Innov 2006;3:11.
2. Shaikh SA. Measures Derived from a 2 x 2 Table for an Accuracy of a Diagnostic Test. J Biomet Biostat 2011, 2:5