attrassign {survival} | 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.
## Default S3 method: attrassign(object, tt,...) ## S3 method for class 'lm': attrassign(object,...)
object |
model matrix or linear model object |
tt |
terms object |
... |
ignored |
A list with names corresponding to the term names and elements that are vectors indicating which columns come from which terms
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)