Sort boxplot by mean (and not median) in R

问题

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?

回答1:

This is a job for reorder():

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

来源：https://stackoverflow.com/questions/9741600/sort-boxplot-by-mean-and-not-median-in-r