[R] lme contrast Error in `$<-.data.frame`(`*tmp*`, "df", value = numeric(0)) :

rahulprabhuh rahulprabhuh at gmail.com
Wed Nov 23 15:48:28 CET 2011

I had the same problem while doing classification using rpart. The mistake I
had made was that the column names in the data frames had spaces and other
special characters. I got the output when I changed this. Hope this helps.

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