r - 在 R 中做数据透视表的另一种方法

Question

我有如下数据集:

> head(worldcup)
               Team   Position Time Shots Passes Tackles Saves
Abdoun      Algeria Midfielder   16     0      6       0     0
Abe           Japan Midfielder  351     0    101      14     0
Abidal       France   Defender  180     0     91       6     0
Abou Diaby   France Midfielder  270     1    111       5     0
Aboubakar  Cameroon    Forward   46     2     16       0     0
Abreu       Uruguay    Forward   72     0     15       0     0

然后是某些变量的代码计数平均值:

wc_3 <- worldcup %>% 
  select(Time, Passes, Tackles, Saves) %>%
  summarize(Time = mean(Time),
            Passes = mean(Passes),
            Tackles = mean(Tackles),
            Saves = mean(Saves))

输出是:

> wc_3
      Time   Passes  Tackles     Saves
1 208.8639 84.52101 4.191597 0.6672269

然后我需要执行如下输出:

      var           mean
     Time    208.8638655
   Passes     84.5210084
  Tackles      4.1915966
    Saves      0.6672269

我试着这样做:

wc_3 <- worldcup %>% 
  select(Time, Passes, Tackles, Saves) %>%
  summarize(Time = mean(Time),
            Passes = mean(Passes),
            Tackles = mean(Tackles),
            Saves = mean(Saves)) %>%
  gather(var, mean, Time:Saves, factor_key=TRUE)

输出是一样的。我的问题:有没有以不同的方式执行相同的输出？

这是我的类(class)，但我的提交被拒绝了。我不知道为什么，但我问过这个。

请指教

Answer 1

一种选择是到 gather首先，按 'Var' 和 summarise 分组获取 mean '瓦尔'

library(dplyr)
library(tidyr)
worldcup %>% 
       gather(Var, Val, Time:Saves) %>% 
       filter(Var!= "Shots") %>%
       group_by(Var) %>% 
       summarise(Mean = mean(Val))