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...mples from same subject) and I used "kernSur" from library(Genkern) to get a estimated bivariate density and corresponding plots as follows: new.data.normal<-data.normal[!is.na(data.normal[,2]),] x<-new.data.normal[,2] y<-new.data.normal[,3] op <- KernSur(x,y, xgridsize=50, ygridsize=50, correlation=0.4968023, xbandwidth=1, ybandwidth=1) #3D density plot persp(op$xvals, op$yvals, op$zden, theta=30,phi=10,expand=0.5,ltheta=120, xlab="TECH3661.A",ylab="TECH3661.B",zlab="Prob",col="pink", , main="3...