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#' @title Multicollinearity test
#' @description
#' multicollinearity is the occurence of high interrelations among two or more independent variables in a multiple regression.
#' @param x is a numeric vector or matrix
#' @param thrs threshold set to calculate correlation above
#' @param num logical
#' @import stats
#' @examples
#' data(macroKZ)
#' corsel(macroKZ,num=FALSE,thrs=0.65)
#' @rdname corsel
#' @export
#data must be without period and NAs (d1<-d[,-1], d<-as.ts(macroKZ))
corsel<-
function (x, thrs,num)
{
if (any(thrs > 1 | thrs < 0))
stop("`thrs` should be on [0,1]", call. = FALSE)
c_Rank<-ifelse(abs(cor(x)>=thrs),TRUE,FALSE)
c_Rank<-as.data.frame(c_Rank)
c<-abs(cor(x))
if (num==FALSE)
print(c_Rank)
else
print(round(c, digits=3))
}
#for (c in 1:ncol(c_Rank)) {
#R<-c()
#for (r in 1:nrow(c_Rank)) {
#if (c_Rank[r,c]==FALSE) {
#R<-c(R,rownames(c_Rank)[r])
#}
#}
#print(paste(c(colnames(c_Rank)[c], "has an appropriate correlation with", R), collapse=" "))
#}
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