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...age VIF but cannot get results I attach the .csv file and my R code. What do I have to do ? Any help is greatly appreciated. library(VIF) coal <- read.csv("e:/freekvif/cqa1.csv",header=TRUE) y <- as.numeric(coal$AI) x <- as.matrix(cbind(coal$Gyp, coal$Pyrite, coal$Sid, coal$Calcite, coal$Dol, coal$Apatite, coal$Kaol, coal$Quartz, coal$Mica, coal$Micro, coal$Rutile)) myd <-list(y=y,x=x) vif.sel <- vif(myd$y, myd$x, subsize=11, trace=FALSE) vif.sel$select Response from R: logical(0) Thank you so much, Jacob