如何根据列组的平均值对数据框进行重新排序 [英] How to reorder a data frame based on mean of column groups
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问题描述
我正在尝试根据与列ID关联的中位数对数据帧进行重新排序.
I am trying to reorder a data frame based on the median value associated with a column ID.
我有一个带有一列ID和两列值的数据框.
I have a dataframe with a column of IDs and 2 columns of values.
ID <- c("a","a","a","b","b","b","c","c","c","c")
alpha <- c(3,4,5,9,11,13,1,1,1,0)
beta <- c(2,3,4,3,4,5,4,5,6,7)
df <- data.frame(ID,alpha,beta)
ID alpha beta
1 a 3 2
2 a 4 3
3 a 5 4
4 b 9 3
5 b 11 4
6 b 13 5
7 c 1 4
8 c 1 5
9 c 1 6
10 c 0 7
我想对该数据帧重新排序,以使列ID的顺序基于alpha列中相关值的递减方式:
I want to reorder this dataframe so that the column ID is in an order based on the decending means of the associated values in the alpha column:
ID alpha beta
1 b 9 3
2 b 11 4
3 b 13 5
4 a 3 2
5 a 4 3
6 a 5 4
7 c 1 4
8 c 1 5
9 c 1 6
10 c 0 7
这不成功:
df[reorder(df$ID, df$alpha, FUN = mean),]
推荐答案
尝试
library(dplyr)
df %>% group_by(ID) %>% mutate(m = mean(alpha)) %>% arrange(desc(m)) %>% select(-m)
# A tibble: 10 x 3
# Groups: ID [3]
ID alpha beta
<fctr> <dbl> <dbl>
1 b 9 3
2 b 11 4
3 b 13 5
4 a 3 2
5 a 4 3
6 a 5 4
7 c 1 4
8 c 1 5
9 c 1 6
10 c 0 7
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