LRneg {samplesizeestimator} | R Documentation |
Sample Size for Estimating LR negative of a Single Diagnostic Test
Description
Calculate sample size(cases) based on negative likelihood ratio an unified index for comparing the accuracy of two diagnostic tests
Usage
LRneg(se, sp, lrneg, alp, pwr, k = 1)
Arguments
se |
anticipated sensitivity of the diagnostic test |
sp |
anticipated specificity of the diagnostic test |
lrneg |
anticipated LR negative value |
alp |
level of significance |
pwr |
desired level of power |
k |
number of control(s) per case |
Value
a list object with minimum required sample size with reporting
Author(s)
R. Amala, Scientist-C, ICMR-VCRC, Puducherry & G. Kumarapandiyan, Asst. Prof., Madras Christian College, Chennai
References
Simel, D.L., Samsa, G.P. Matchar, D. B. (1991). Likelihood ratio with confidence: sample size estimation for diagnostic test studies. J Clin Epidemiol. 44: 763-70.
Examples
LRneg(se=0.9, sp=0.5,lrneg=0.4,alp=0.05, pwr=0.8,k=1)
[Package samplesizeestimator version 1.0.0 Index]