Nothing
eta.w.hat<-function(xin,kfun)
{
s1<-length(xin)
h<- bw.nrd(xin)
Vi1 <-IntKde(xin, xin, h, IntEpanechnikov)
Ui1.1<-kde(xin, xin, h, kfun)
Ui1.2<-kde(xin, -xin, h, kfun)
Ui1<- (Ui1.1+ Ui1.2)/2
MeanUi1<-mean(Ui1 )
MeanVi1<-mean(Vi1)
etahat<- -(sum(Ui1 * Vi1) - s1 * MeanUi1 * MeanVi1)/sqrt( (sum(Ui1^2) - s1 *MeanUi1^2) * (sum(Vi1^2) - s1 * MeanVi1^2))
etahat
}
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