有条件地在dplyr中计数

有条件地在dplyr中计数

本文介绍了有条件地在dplyr中计数的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述



这是数据的样子:

  memberorders = data.frame(MemID = c('A','A','B','B','B' ,'C','D'),
week = c(1,2,1,4,5,1,4,1),
value = c(10,20,10,10 ,2,5,30,3))

我正在使用dplyr to group_byMemID和总结周的值< = 2和< = 4(以查看在1-2周和1-4周内订购的成员数量。我目前的代码是:

  MemberLTV<  -  memberorders%>%
group_by(MemID)%>%
总结(
sum2 = sum (值[week< = 2]),
sum4 = sum(value [week< = 4]))

我现在正在尝试在总结count2和count4中添加两个字段,这些字段可以计算每个条件的实例数(周< = 2和week< = 4)。



所需的输出是:

  output = data.frame(MemID = c('A','B','C','D'),
sum2 = c(30,10 ,5,3),
sum4 = c(30,20,35,3),
count2 = c(2,1,1,1),
count4 = c(2, 2,2,1))

我猜这只是一个调和功能的一点调整,

解决方案

尝试

  library(dplyr)
memberorders%>%
group_by(MemID)%>%
总结(sum2 = sum(value [week< = 2 ]),sum4 = sum(value [week count2 = sum(week


I have some member order data that I would like to aggregate by week of order.

This is what the data looks like:

memberorders=data.frame(MemID=c('A','A','B','B','B','C','C','D'),
             week = c(1,2,1,4,5,1,4,1),
             value = c(10,20,10,10,2,5,30,3))

I'm using dplyr to group_by "MemID" and summarize "value" for "week" <=2 and <=4 (to see how much each member ordered in weeks 1-2 and 1-4. The code I currently have is:

MemberLTV <- memberorders %>%
group_by(MemID) %>%
summarize(
sum2 = sum(value[week<=2]),
sum4 = sum(value[week<=4]))

I'm now trying to add two more fields in summarize, count2 and count4, that would count the number of instances of each condition (week <=2 and week <=4).

The desired output is:

output  = data.frame(MemID = c('A','B','C','D'),
                 sum2 = c(30,10,5,3),
                 sum4 = c(30,20,35,3),
                 count2 = c(2,1,1,1),
                 count4 = c(2,2,2,1))

I'm guessing it's just a little tweak of the sum function but I'm having trouble figuring it out.

解决方案

Try

 library(dplyr)
 memberorders %>%
        group_by(MemID) %>%
        summarise(sum2= sum(value[week<=2]), sum4= sum(value[week <=4]),
                  count2=sum(week<=2), count4= sum(week<=4))

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08-18 09:05