Hi,all, when I run the below code,there is an error occured. could you please tell me how to treat it? > pdf('covariate.pdf') > par(mfrow=c(1,1)) > pairs(data2[,c("ID","TYPE","AGE","GNDR","HT")], + panel=function(x,y) { points(x,y); lines(lowess(x,y))}) Error in `[.data.frame`(data2, , c("ID", "TYPE", "AGE", "GNDR", "HT")) : undefined columns selected > dev.off() RStudioGD 2 Thank you very much!
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