ebdt_ppv: Calculates the Positive Predictive Value (only...

In ebdt: Evaluation of Binary Diagnostic Test

Calculates the Positive Predictive Value (only Cross-sectional study)

Description

This function calculate the Positive predictive value estimator, their standard error estimated and a confidence interval in a traverse.

Usage

ebdt_ppv(s1, r1, s0, r0, conflev = 0.95, digits = 3, verbose = TRUE)

Arguments

s1	Non-negative numeric. TP - True positive (cases correctly classified as +).
r1	Non-negative numeric. FP - False positives (controls classified as +).
s0	Non-negative numeric. FN - False negatives (cases classified as -).
r0	Non-negative numeric. TN - True negatives (controls classified as -).
conflev	Confidence level (0,1). Default 0.95.
digits	Integer. Number of decimal places. Default 3.
verbose	Logical. If TRUE, it prints the execution time. Default is TRUE.

Details

Evaluating of Binary Diagnostic Test (EBDT)

This function calculates the Positive Predictive Value (PPV) with Simel and Gart - Nam ICs

Value

list with: - est: PPV = s1 / (s1 + r1) - StdError: binomial standard error of PPV - CI: vector c(inf, sup) IC for NPV - CI_Method: "Agresti-Coull"

References

Agresti, A., (2002). Categorical Data Analysis. John Wiley and Sons, New York.

Agresti, A., Coull, B.A., (1998). Approximate is better than ‘exact’ for interval estimation of binomial proportions. The American Statistician, 52:119 – 126.

Montero-Alonso, M.Á.(2010). Intervalos de confianza y contrastes de hipótesis para parámetros de tests diagnósticos binarios, http://hdl.handle.net/10481/4879

Simel D.L., Samsa, G.P., Matchar, D.B., (1991). Likelihood ratios with confidence: sample size estimation for diagnostic test studies. J. Clin Epidemiology, 44(8): 763-770.

Pepe, M. S. (2003). The statistical evaluation of medical tests for classification and prediction. Oxford University Press.

Zhou, X.-H., Obuchowski, N. A., y McClish, D. K. (2011). Statistical Methods in Diagnostic Medicine (2.ª ed.). John Wiley & Sons.

Examples

ebdt_ppv(40, 5, 10, 45)

ebdt documentation built on Aug. 27, 2026, 1:08 a.m.