I have this
> grades$grade
...
[4009] A B A- A- A- B+ A A- B+ B A B B B A A- A A- A- B+ A- A A B+
[4033] A- A- A- A A- B A A A- A
Levels: A A- A+ B B- B+ C C+
I want to change the order of the levels
> reorder(grades$grade,c('A+','A','A-','B+','B','B-','C+','C'))
Error in tapply(X, x, FUN, ...) : arguments must have same length
What am I doing wrong? Thanks
Tom
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