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2013 Nov 08
1
Different output from lm() and lmPerm lmp() if categorical variables are included in the analysis
...ategorical variables in lmp() from package lmPerm
According to help(lmp): "This function will behave identically to lm()
if the following parameters are set: perm="", seq=TRUE,
center=FALSE.")
But not in the case of including categorical variables:
require(lmPerm)
set.seed(42)
testx1 <- rnorm(100,10,5)
testx2 <- c(rep("a",50),rep("b",50))
testy <- 5*testx1 + 3 + runif(100,-20,20)
test <- data.frame(x1=testx1,x2=
testx2,y=testy)
atest <- lm(y ~ x1*x2,data=test)
aptest <- lmp(y ~ x1*x2,data=test,perm = "", seqs = TRUE, center = FALS...