按R中的平均值（而非中位数）对boxplot排序

Question

I have a simple boxplot, showing the distribution of a score for factor TYPE:

myDataFrame = data.frame( TYPE=c("a","a","b","b","c","c"), SCORE=c(1,1,2,3,2,1) )
boxplot( SCORE~TYPE, data=myDataFrame )

The various types are shown in the order they have in the data frame. I'd like to sort the boxplot by the mean of SCORE in each TYPE (in the example above, the order should be a,c,b ).

Any hint?

Answer 1

This is a job for reorder() :

myDataFrame$TYPE <- with(myDataFrame, reorder(TYPE, SCORE, mean))
boxplot( SCORE~TYPE, data=myDataFrame )