multi stage survival model and ridge regression

[MANOJ KUMAR]

Dear respected member, 

during the analysis of multi stage analysis through r code:

two questions: one ,if the ridge function is appropriate and second one how to decide the theta value...) 

mcph <-
      coxph(
        Surv(Tstart, Tstop, outc == levels(v$outc)[j]) ~
          ridge( wnd_age_s, female, dm, wnd_cat1, wnd_cat2, wnd_cat3, wnd_cat4, theta = 5), 

Thanks,

Manoj

University of Pittsburgh

+1-412 5898944