psi {ClinSigMeasures}

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)

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

Value

Predictive Summary Index

Author(s)

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

Examples

#From Shaikh (2011), page 3, 2x2 table for "Diagnostic Test Evaluation"

psi(105, 171, 15, 87)