如何通過

Question

組

重塑一個data.frame我想下表轉

+---------+----------+------+-------+ 
| var | Year | A | B | 
+---------+----------+ -----+-------+ 
| Mean | 2006 | 1.3 | 4.6 | 
| Median | 2006 | 1.4 | 4.1 | 
| Mean | 2007 | 3.6 | 5.5 | 
| Median | 2007 | 4.0 | 5.5 | 
| Mean | 2008 | 5.5 | 4.0 | ` 
| Median | 2008 | 5.5 | 5.1 | 
+---------+----------+------+-------+ 

喜歡的東西：

+---------+----------+------+--------+ 
| var | Year | Mean | Median | 
+---------+----------+ -----+--------+ 
| A  | 2006 | 1.3 | 1.4 | 
|   | 2007 | 3.6 | 4.0 | 
|   | 2008 | 5.5 | 5.5 | 
| B  | 2006 | 5.5 | 4.6 | 
|   | 2007 | 5.5 | 5.5 | ` 
|   | 2008 | 5.1 | 5.1 | 
+---------+----------+------+--------+ 

我試圖用重塑移調但主要困難是使這一年保持多頭。

Answer 1

這是一種使用reshape2來完成的方法。訣竅是首先將數據轉換爲長格式。

library(reshape2) 
d <- data.frame(var=c("Mean", "Median"), 
       Year=sort(rep(2006:2008,2)), 
       A=1:6, B=11:16) 
d_melted <- melt(d, measure.vars=c("A", "B")) 
dcast(d_melted, variable + Year ~ var)