Youden3Grp.OptimalCutoff.Normal.trueMeanSD: The Youden index and optimal cut point estimation under...

In DiagTest3Grp: Diagnostic test summary measures for three ordinal groups

Description

For a diagnostic test folling normal distributions, given the true or estimated normal distribution mean and standard deviation (SD) parameters for three ordinal diagnostic groups, ,calculate the Youden index and optimal cut point estimations for three ordinal diagnostic groups (usllay healthy D- , mildly diseased D0 and diseased D+).

Usage

 Youden3Grp.OptimalCutoff.Normal.trueMeanSD(mu.minus, mu0,
 mu.plus, s.minus, s0, s.plus) 

Arguments

mu.minus	A numeric value. The mean parameter of normal distribution in D- group.
mu0	A numeric value. The mean parameter of normal distribution in D0 group.
mu.plus	A numeric value. The mean parameter of normal distribution in D+ group.
s.minus	A numeric value. The SD parameter of normal distribution in D- group.
s0	A numeric value. The SD parameter of normal distribution in D0 group.
s.plus	A numeric value. The SD parameter of normal distribution in D+ group.

Details

See references.

Value

A data frame of numeric components,

t.minus	The dervied optimal lower cut-point t.minus
t.plus	The dervied optimal upper cut-point t.minus
youden	The dervied optimal youden index

Note

Bug reports, malfunctioning, or suggestions for further improvements or contributions can be sent to Jingqin Luo <[e-mail]>.

Author(s)

Jingqin Luo

References

Jingqin Luo and Chengjie Xiong (2012) Youden Index and Associated Optimal Cut-point for Three Ordinal Groups. Communications In Statistics–Simulation and Computation (in press).

See Also

Youden3Grp

Examples

 mu.minus <- 6
 s.minus <- 1

 mu0 <- 8
 s0 <- 1.2

 mu.plus <- 11.05
 s.plus <- 1.4


Youden3Grp.OptimalCutoff.Normal.trueMeanSD(mu.minus,mu0,mu.plus,s.minus,s0,s.plus)

DiagTest3Grp documentation built on April 14, 2017, 5:53 p.m.