Fit a Three-factor Box-Tidwell Nonlinear Response Surface
Usage
rs3(y, x1, x2, x3, power=c(1,1,1), weight=rep(1,length(y)),
family=normal, iterlim=20)
Arguments
y
|
Response variable
|
x1
|
First covariate
|
x2
|
Second covariate
|
x3
|
Third covariate
|
power
|
Initial estimates of the three power transformations
|
weight
|
Weight vector
|
family
|
glm family
|
iterlim
|
Iteration limit
|
Description
rs3
fits a three-covariate power-transformed response surface by
iterating the function, glm
.Value
A list of class, rs, is returned containing the model and the power
estimates.Author(s)
J.K. LindseySee Also
lm
, glm
, gnlr
, gnlr3
,
fmr
, rs2
.Examples
x1 <- rep(1:4,5)
x2 <- rep(1:5,rep(4,5))
x3 <- c(rep(1:3,6),1,2)
y <- rpois(20,1+2*sqrt(x1)+3*log(x2)+1/x3+4*x1+log(x2)^2+1/x3^2+
2*sqrt(x1)*log(x2)+sqrt(x1)/x3+log(x2)/x3)
rs3(y, x1, x2, x3, family=poisson)