DiagTest3Grp (version 1.6)

Youden3Grp.OptimalCutoff.Normal.trueMeanSD: The Youden index and optimal cut point estimation under normal distribution for three ordinal diagnostic 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.

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

Details

See references.

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)