w: Nonlinear S-shaped Model

In unkyunglee/HDChangePoint: Estimating disease onset from change points of markers measured with error

Description

Nonlinear S-shaped Model

Usage

w(x, logT, model)

Arguments

x	a vector of time points. It can be any length of a vector.
logT	a parameter for an inflection point.
model	a character string for a nonlinear model: "logist" or "arctan".

Value

a vector of response values corresponding a vector of time points x, whose trajecotry follows an S-shape. Two deterministic "S"-shaped functions are the logstic and the aractangent functions and user can choose either one.

Examples

library(HDChangePoint)


## Generate a vector of time points and an inflection point in the domain of the time points
x<-seq(-0.5, 0.5, by=0.1); logT<-0;

## Obtain an S-shaped function under the logistic model
out<-w(x, logT, model="logist");
plot(out)

## Obtain an S-shaped function under the arctangent model
out1<-w(x, logT, model="arctan");
plot(out1)

unkyunglee/HDChangePoint documentation built on Nov. 27, 2021, 2:57 p.m.