How to sort boxplots by average or median on R

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How to order a series of boxplots by median or average?

The command used: boxplot(base$y~base$FID) sorts charts by order of the base variable$FID, I would need the sort to be done by the average or median of the base variable$y.

Following example basis:

FID  y
1   -0,078
1   3,855
1   2,287
1   2,112
2   -0,245
2   0,462
2   1,282
2   1,128
3   -0,058
3   -0,990
3   -0,144
3   -1,336
4   -0,120
4   -4,286
4   -1,295
4   -1,022
5   1,242
5   2,599
5   2,278
5   3,032
r

  • You could provide more information, your question is not clear. Do you want to reorder this data or the graphics generated by this data? What is FID, divides the data into groups, or y, is the data, is this?

  • Hello Jean, thanks for the feedback, I added more information in order to avoid ambiguities.

1 answer

3


You need to turn the FID variable into factor orderly. It can be done like this:

dados <- 
  data.frame(
    FID = rep(1:5, each = 5),
    y = 25:1
  )
medianas <- tapply(dados$y, dados$FID, median)
dados$FID <- factor(dados$FID, levels = names(medianas)[order(medianas)])
boxplot(y ~ FID, data = dados)

inserir a descrição da imagem aqui

Here I ordered by the median, to order by the average, just change the command tapply(dados$y, dados$FID, median) for tapply(dados$y, dados$FID, mean).

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