Hi,

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

 when I try colnames(data2) or names(data2) ,it shows as follows:
> colnames(data2)
 [1] "X"     "X1"    "X0"    "."     "..1"
 I think this may be the problem. Could you please tell me how to treat it?

Thank you!

Cassie

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