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並前往https://stackoverflow.com/questions/69418855/r-how-to-get-factor-levels-found-in-data

R: How to get factor levels found in data - Stack Overflow

We may use droplevels levels(droplevels(df$v1)) [1] "a" "b" "c". Or just wrap factor again to reset the levels levels( factor(df$v1) ) [1] ...

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