wts {frailtypack}

Identify weights

Description

This is a special function used in the context of the joint frailty models for data from nested case-control studies. It specifies weights defined by using 'wts' function, and is used of 'frailtyPenal' formula for fitting joint models.

Usage

wts(x)

Arguments

x

A numeric variable which is supposed to indicate the weights

Value

x

A variable identified as weights

See Also

frailtyPenal

Examples

data(dataNCC)
modJoint.ncc <- frailtyPenal(Surv(t.start,t.stop,event)~cluster(id)+cov1
+cov2+terminal(death)+wts(ncc.wts), formula.terminalEvent=~cov1+cov2,
data=dataNCC,n.knots=8,kappa=c(1.6e+10, 5.0e+03),recurrentAG=TRUE, RandDist="LogN") 



print(modJoint.ncc)