R:如何根据其他变量的分组进行行和?
以下是示例数据:R:如何根据其他变量的分组进行行和?,r,R,以下是示例数据: df <- data.frame("ID1" = c("A","A","B","C"), "Wt1" = c(0.8,0.6,0.4,0.5), "ID2" = c("B","A","C","B"), "Wt2" = c(0.1,0.4,0.5,0.5), "ID3" = c("C",NA,"C",NA), "Wt3" = c(0.1,NA,0.1,
df <- data.frame("ID1" = c("A","A","B","C"),
"Wt1" = c(0.8,0.6,0.4,0.5),
"ID2" = c("B","A","C","B"),
"Wt2" = c(0.1,0.4,0.5,0.5),
"ID3" = c("C",NA,"C",NA),
"Wt3" = c(0.1,NA,0.1,NA))
df首先,很难操作这样格式的表。这不是您想要的输出,但我担心您可能会被困在路上
一个建议是设置表的格式,以便我们可以轻松地从中检索信息
为每个观察分配id
df$obs <- 1:nrow(df)
我们通过obs和ID对投票数求和
dt[,total:=sum(Wt,na.rm=TRUE),.(obs,ID)]
这样检索信息就很容易了
dt[,vote:=.SD[which.max(total)],obs]
#dt
# ID Wt obs total vote
# 1: A 0.8 1 0.8 A
# 2: A 0.6 2 1.0 A
# 3: B 0.4 3 0.4 C
# 4: C 0.5 4 0.5 C
# 5: B 0.1 1 0.1 A
# 6: A 0.4 2 1.0 A
# 7: C 0.5 3 0.6 C
# 8: B 0.5 4 0.5 C
# 9: C 0.1 1 0.1 A
# 10: NA NA 2 0.0 A
# 11: C 0.1 3 0.6 C
# 12: NA NA 4 0.0 C
df[is.na(df)]谢谢@皮埃尔拉·福琼。这个解决方案很有效,而且非常简洁。。。您能进一步解释吗?您没有为相同的值指定连接断路器谢谢@DJJ我意识到添加行标签并转换为长格式是一个非常好的主意。我可以通过obs将原始表与结果表左键联接。
dt <- as.data.table(df1)
dt[,total:=sum(Wt,na.rm=TRUE),.(obs,ID)]
dt[,vote:=.SD[which.max(total)],obs]
#dt
# ID Wt obs total vote
# 1: A 0.8 1 0.8 A
# 2: A 0.6 2 1.0 A
# 3: B 0.4 3 0.4 C
# 4: C 0.5 4 0.5 C
# 5: B 0.1 1 0.1 A
# 6: A 0.4 2 1.0 A
# 7: C 0.5 3 0.6 C
# 8: B 0.5 4 0.5 C
# 9: C 0.1 1 0.1 A
# 10: NA NA 2 0.0 A
# 11: C 0.1 3 0.6 C
# 12: NA NA 4 0.0 C