HI, Dear R community,

Last friday, I used the codes, it works, but today, it does not run?


> fit.dimer <- rpart(outcome ~., method="class", data=p.df)
Error in `[.data.frame`(frame, predictors) : undefined columns selected


DOEs anyone have comments or suggestions?   Thanks in advance!



-- 
Sincerely,
Changbin
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