我已经将SPSS .SAV文件中的访谈数据导入 data.frame
,现在我'm trying to create a frequency table based on the question number and interview location. Here'是一个例子 data.frame
:
loc<-c("city1","city2","city1","city2","city1","city1","city2","city2","city1","city2")
q1<-c("YES","YES","NO","MAYBE","NO","NO","YES","NO","MAYBE","MAYBE")
q2<-c("YES","NO","MAYBE","YES","NO","MAYBE","MAYBE","YES","YES","NO")
q3<-c("NO","NO","NO","NO","YES","YES","MAYBE","MAYBE","NO","MAYBE")
df<-data.frame(loc,q1,q2,q3)
df
loc q1 q2 q3
1 city1 YES YES NO
2 city2 YES NO NO
3 city1 NO MAYBE NO
4 city2 MAYBE YES NO
5 city1 NO NO YES
6 city1 NO MAYBE YES
7 city2 YES MAYBE MAYBE
8 city2 NO YES MAYBE
9 city1 MAYBE YES NO
10 city2 MAYBE NO MAYBE
现在我想根据问题编号 "q1","q2","q3"
和位置 "city1","city"
计算每个答案选项 "YES","NO","MAYBE"
的出现次数 . 结果 data.frame
应该如下所示:
loc quest answ freq
1 city1 q1 YES 1
2 city1 q1 NO 3
3 city1 q1 MAYBE 1
4 city2 q1 YES 2
5 city2 q1 NO 1
6 city2 q1 MAYBE 2
7 city1 q2 YES 2
8 city1 q2 NO 1
9 city1 q2 MAYBE 2
10 city2 q2 YES 2
11 city2 q2 NO 2
12 city2 q2 MAYBE 1
13 city1 q3 YES 2
14 city1 q3 NO 3
15 city1 q3 MAYBE 0
16 city2 q3 YES 0
17 city2 q3 NO 2
18 city2 q3 MAYBE 3
到目前为止,我已经使用 plyr
包中的 count()
, ddply()
和 summarise()
而没有运气 . 我当前的解决方案非常hacky并且涉及将 df
拆分为 loc
,使用 as.data.frame(summary(df_city1))
创建频率表,从摘要字符串中检索频率并将 city1
和 city2
的摘要 data.frame
合并在一起 . 我想必须有一个更容易/更优雅的解决方案 .
1 回答
我们将数据集从'wide'转换为'long'(
gather
执行此操作),然后将group_by
)'loc','quest','answ'转换为tally
并使用tally
来获取计数 . 但是,如果我们正在寻找数据集中未找到的组合计数为0,那么我们可能需要连接具有三列所有unique
组合的数据集(complete
和unique
这样做) .