Nothing
influence_plot <-
function(M,large.cook,cooks=FALSE) {
if(head(class(M),1)!="lm") { stop(cat("Argument must be a fitted model using lm()\n")) }
par(mfrow=c(1,1))
par(mar=c(5,4,4,2)+0.1)
plot( hatvalues(M), rstudent(M), type="n", xlab="Leverage", ylab="deleted Studentized residuals", main="",cex.lab=1.2,cex.axis=1.2)
cook <- cooks.distance(M)
if(!missing(large.cook)) { big.cooks <- which(cook>large.cook) } else {
big.cooks <- which(cook>4/length(cook) ) }
influential <- intersect(which(hatvalues(M)>(2*length(M$coef)/length(M$res))),which(abs(rstudent(M))>2))
shade <- grey(rep(.4, length(M$res) ))
shade[big.cooks] <- grey(0)
sizes <- rep(1,length(M$res))
sizes[big.cooks] <- 2.5
border <- rep(1,length(M$res))
border[big.cooks] <- 2
points( hatvalues(M), rstudent(M), cex= 10*sqrt(cook)/max(sqrt(cook)),col=shade,lwd=sizes)
if (length(influential)>0) { text( hatvalues(M)[influential], rstudent(M)[influential], "x") }
abline(v=2*length(M$coef)/length(M$res))
abline(h=c(-2,2))
if(cooks==TRUE) { output<-list(Cooks=big.cooks, Leverage=influential) } else {
output<-list(Leverage=influential)
}
return(output)
}
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