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If x is a data.frame containing a column of mode character, this column is changed to a factor after applying fix(x). Example: R> x_data.frame(a=1:3,b=letters[1:3],c=c("hansi","pepi","karli")) R> x$c_as.character(x$c) R> is.character(x$c) [1] TRUE R> is.factor(x$c) [1] FALSE R> fix(x) ## I change "karli" to "sepp" R> x$c [1] hansi pepi sepp Levels: hansi pepi sepp R> is.character(x$c) [1] FALSE R> is.factor(x$c) [1] TRUE Now, it is not possible to apply...