attrassign {survival5} | R Documentation |
The "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.
attrassign(mmat, tt) attrassign(lm)
mmat |
Model matrix |
tt |
terms object |
lm |
linear model |
A list with names corresponding to the term names and elements that are vectors indicating which columns come from which terms
data(pbc) 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)