[英]How to calculate row sums or counts on selected columns with condition using tidyverse?
我有以下数据框(这是大于3000 obs的较大数据框的子集,具有2个不同级别的年份):
rp.pptn <- data.frame(id = c("150015", "150016", "150017", "150018",
"150019", "150020"), year = structure(c(1L, 1L, 1L, 1L, 1L, 1L),
.Label = c("15", "18"), class = "factor"),
freqtools = c(1, 1, 2, 1, 1, 3), freqtrees = c(2, 3, 3, 5, 4, 3),
freqrt = c(2, 2, 2, 2, 1, 3), freqroamfriends = c(1, 1, 1, 3, 1, 1),
freqroamalone = c(1, 1, 1, 2, 1, 1), freqparts = c(2, 2, 2, 2, 3, 3),
freqmessy = c(5, 5, 2, 5, 4, 5), freqride = c(3, 1, 2, 5, 3, 3),
freqrain = c(1, 3, 2, 3, 1, 3))
我想count
满足条件的cols c(3:11)
中的值。 我一直在尝试rowSums,因为当我没有id
或分组变量year
, rowSums
实际上给了我这样的计数:
rp.pptn.no.id <- rp.pptn %>%
select(c(3:11)) %>%
mutate(pptnlow = rowSums(pptnrp == 1 | pptnrp == 2 | pptnrp == 6))
我还能够如下计算选择列的rowSums
:
rp.pptn <- rp.pptn %>%
mutate(pptnlow = rowSums(.[c(3:11)]))
但是,鉴于我需要id
和year
来进行后续分析,因此我想一次性完成这两个步骤。 我很感兴趣为什么要考虑到我的数据是数字的, rowSums
在一开始的rowSums
会给我计数而不是总和。 我实际上希望计数,即有多少列符合我的条件?
搜索使我认为基于此的某些功能可能会起作用:
rp.pptn <- rp.pptn %>%
mutate(pptnlow = rowSums(. [3:11]) %in% c(1, 2, 6))
这返回逻辑向量= FALSE
,大概是因为我的条件未满足。 我认为我并没有丢失太多,但最终我想要的是以下df:
rp.pptn <- data.frame(id = c("150015", "150016", "150017", "150018",
"150019", "150020"), year = structure(c(1L, 1L, 1L, 1L, 1L, 1L),
.Label = c("15", "18"), class = "factor"),
freqtools = c(1, 1, 2, 1, 1, 3), freqtrees = c(2, 3, 3, 5, 4, 3),
freqrt = c(2, 2, 2, 2, 1, 3), freqroamfriends = c(1, 1, 1, 3, 1, 1),
freqroamalone = c(1, 1, 1, 2, 1, 1), freqparts = c(2, 2, 2, 2, 3, 3),
freqmessy = c(5, 5, 2, 5, 4, 5), freqride = c(3, 1, 2, 5, 3, 3),
freqrain = c(1, 3, 2, 3, 1, 3), pptnlow = c(7, 6, 8, 4, 5, 2))
如前所述,我的实际数据集更大,因此自动化程度越高越好! 谢谢。
一种选择是reduce
与map
library(tidyverse)
map(c(1, 2, 6), ~ rp.pptn %>%
transmute_at(3:11, funs(. == .x)) %>%
reduce(`+`)) %>%
reduce(`+`) %>%
mutate(rp.pptn, pptnlow = .)
或与rowSums
和map
map(c(1, 2, 6), ~
rp.pptn %>%
select(3:11) %>%
transmute(pptnlow = rowSums(. == .x))) %>%
bind_cols %>%
rowSums %>%
mutate(rp.pptn, pptnlow = .)
我们可以使用mutate_at
使用TRUE
或FALSE
替换基于条件( mutate_at
的值,使用rowSums
,然后绑定到原始数据帧。
library(dplyr)
rp.pptn2 <- rp.pptn %>%
mutate_at(vars(3:11), funs(. %in% c(1, 2, 6))) %>%
transmute(pptnlow = rowSums(.[, 3:11])) %>%
bind_cols(rp.pptn, .)
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