Nothing
gini.den <-
function (incs,dens,pm0=NA,lower=NULL,upper=NULL){
if(length(incs)!=length(dens)) print("incs and dens must have the same length!")
incs <- as.numeric(incs)
if(is.null(lower)) lower<-min(incs)
if(is.null(upper)) upper<-max(incs)
if(min(incs)<lower) print("WARNING: min(incs)<lower int limit!")
if(!is.na(pm0)&incs[1]==0) incs<-incs[-1]
n.inc <- length(incs)
incs.diff <- diff(incs)
av.incs <- (incs[-1]+incs[-n.inc])/2
dens <- as.numeric(dens)
if(!is.na(pm0)&dens[1]==pm0) dens<-dens[-1]
av.dens <- (dens[-1]+dens[-n.inc])/2
fi.inner <- av.dens*incs.diff
fi.outer <- c(dens[1]/2*(incs[1]-lower),dens[n.inc]/2*(upper-incs[n.inc]),pm0)
if(!is.na(pm0)&incs[1]==0) Gini<-weighted.gini(x=c(0,lower,av.incs,upper),w=c(fi.outer[3],fi.outer[1],fi.inner,fi.outer[2]))$Gini
else Gini<-weighted.gini(x=c(lower,av.incs,upper),w=c(fi.outer[1],fi.inner,fi.outer[2]))$Gini
list(Gini=Gini,pm0=pm0,lower=lower,upper=upper)
}
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