
"assign"
attribute on model matrices describes which columns
come from which terms in the model formula. It has two version. R uses
the original version, but the newer version is sometimes useful.## S3 method for class 'default':
attrassign(object, tt,...)
## S3 method for class 'lm':
attrassign(object,...)
terms
,model.matrix
formula<-Surv(time,status)~factor(edtrt)
tt<-terms(formula)
mf<-model.frame(tt,data=pbc)
mm<-model.matrix(tt,mf)
## a few rows of data
mm[1:3,]
## old-style assign attribute
attr(mm,"assign")
## new-style assign attribute
attrassign(mm,tt)
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