假设您的源表格看起来像这样:
dfm <- structure(list(ID1 = structure(c(1L, 2L, 3L, 1L, 2L, 3L, 1L,
2L, 3L, 1L, 2L, 3L, 1L, 2L, 3L), .Label = c("ID1a", "ID1b", "ID1c"
), class = "factor"), ID2 = structure(c(1L, 1L, 1L, 2L,
2L, 2L, 3L, 3L, 3L, 4L, 4L, 4L, 5L, 5L, 5L), .Label = c("ID2a",
"ID2b", "ID2c", "ID2d", "ID2e"), class = "factor"), value = c(6459695L,
7263529L, 7740364L, 885473L, 1411355L, 1253524L, 648019L, 587785L,
682977L, 453613L, 612730L, 886897L, 1777308L, 2458672L, 3559283L
)), .Names = c("ID1", "ID2", "value"), row.names = c(NA,
-15L), class = "data.frame")
> head(dfm)
ID1 ID2 value
1 ID1a ID2a 6459695
2 ID1b ID2a 7263529
3 ID1c ID2a 7740364
4 ID1a ID2b 885473
5 ID1b ID2b 1411355
6 ID1c ID2b 1253524
首先使用ddply
计算百分比,然后使用cast
以所需格式呈现数据。
library(reshape)
library(plyr)
df1 <- ddply(dfm, .(ID1), summarise, ID2 = ID2, pct = value / sum(value))
dfc <- cast(df1, ID1 ~ ID2)
dfc
ID1 ID2a ID2b ID2c ID2d ID2e
1 ID1a 0.6318101 0.08660638 0.06338147 0.04436700 0.1738350
2 ID1b 0.5888996 0.11442735 0.04765539 0.04967784 0.1993399
3 ID1c 0.5480662 0.08875735 0.04835905 0.06279786 0.2520195
与您的示例相比,这个缺少了行总计,需要单独添加。
不过,我不确定这个解决方案是否比您当前拥有的更优雅。