Question

我试图使用多个组对一个变量求和，但总是得到总和，尝试了dplyr，data.table和aggregate，但我总是得到总和，而不是组总和。

最后的努力是as.data.table

Totals06 <- as.data.table(testQ)[, sum(testQ$v23, na.rm=TRUE), by = .(testQ$v01, testQ$v05, testQ$v09)]

我做一些非常愚蠢的事情，感谢任何帮助。

Answer 1

由于缺乏可重复的例子，这里有一个玩具示例：

df = data.frame(a=c("A","A","A","B","B","C","C","C"),species=c("cat","cat","dog","cat","dog","dog","horse","dog"),exp=c(1,2,3,4,5,3,2,1))

>df
#  a species exp
#1 A     cat   1
#2 A     cat   2
#3 A     dog   3
#4 B     cat   4
#5 B     dog   5
#6 C     dog   3
#7 C   horse   2
#8 C     dog   1

使用dplyr并按两个变量分组：

df%>%group_by(a,species)%>%summarise_at(.funs = sum,.vars = c("exp"))

# A tibble: 6 x 3
# Groups:   a [?]
#       a species   exp
#    <fctr>  <fctr> <dbl>
#1      A     cat     3
#2      A     dog     3
#3      B     cat     4
#4      B     dog     5
#5      C     dog     4
#6      C   horse     2

在尝试使用多个组对变量求和时获得总和

1 个答案: