This is a special function used in addition to the
in the context of survival joint models for clustered data. This function
identifies subject index. It is used on the right hand side of a
'frailtyPenal' formula. Using
num.id() in a formula implies that a
joint frailty model for clustered data is fitted (Rondeau et al. 2011).
A character or numeric variable which is supposed to indicate the variable identifying individuals
V. Rondeau, J.P. Pignon, S. Michiels (2011). A joint model for the dependence between clustered times to tumour progression and deaths: A meta-analysis of chemotherapy in head and neck cancer. Statistical methods in medical research 897, 1-19.
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## Not run: data(readmission) #-- here is generated cluster (5 clusters) readmission <- transform(readmission,group=id%%5+1) #-- exclusion all recurrent events --# #-- to obtain framework of semi-competing risks --# readmission2 <- subset(readmission, (t.start == 0 & event == 1) | event == 0) joi.clus.gap <- frailtyPenal(Surv(time,event)~cluster(group)+ num.id(id)+dukes+charlson+sex+chemo+terminal(death), formula.terminalEvent=~dukes+charlson+sex+chemo, data=readmission2,recurrentAG=FALSE, n.knots=8, kappa=c(1.e+10,1.e+10) ,Alpha="None") ## End(Not run)
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