Dear prof. Harrell,
I'm not able to use the force option with fastbw, here an example of the error
I've got (dataset stagec rpart package):
> fitstc <- cph(Surv(stagec$pgtime,stagec$pgstat) ~ age + eet + g2 + grade +
> gleason + ploidy, data=stagec)
> fbwstc <- fastbw(fitstc,rule="aic",type="in
Jon,
Version 3.3-0 of rms will be released within 2-3 days. It has a new option
"force" for fastbw, validate, calibrate. force is an integer vector of the
parameter numbers to force into every model. It is meant to work with
type='individual' and its performance with type='residual' needs to be
Hello all
I am a very new R user
I am used to using STATA
My problem:
I want to build a Cox model and validate this.
I have a large number of clinical relevant factors and feel the need to
reduce these. Meanwhile I have some clinical variables I deem sufficiently
important to fo
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