R 总结满足条件的第一行
假设我有这个数据框:R 总结满足条件的第一行,r,dplyr,conditional-statements,lag,summarize,R,Dplyr,Conditional Statements,Lag,Summarize,假设我有这个数据框: df <- data.frame( party = c("A", "A", "B", "A", "B"), votes = c(100, 99, 98, 97, 96), elected = c(1, 1, 1, 0, 0, 0) ) party votes elected 1 A 100 1 2 A 99 1 3 B 98 1 4 A
df <- data.frame(
party = c("A", "A", "B", "A", "B"),
votes = c(100, 99, 98, 97, 96),
elected = c(1, 1, 1, 0, 0, 0)
)
party votes elected
1 A 100 1
2 A 99 1
3 B 98 1
4 A 97 0
5 B 96 0
我尝试了
first()
和lag()
使用which()
的条件,但目前没有运气。非常感谢您的帮助。这是使用fuzzyjoin
-package的一个选项
library(fuzzyjoin)
library(tidyverse)
fuzzy_left_join(df, df %>%
arrange(party, elected, desc(votes)) %>%
group_by(party) %>% slice(1) ,
by = c("party", "elected"), match_fun = list(`!=`, `>`)) %>%
select(ends_with("x"), votes.y)
party.x votes.x elected.x votes.y
1 A 100 1 96
2 A 99 1 96
3 B 98 1 97
4 A 97 0 NA
5 B 96 0 NA
也许这对你有用你可以尝试使用一个函数
library(dplyr)
get_opposite_votes <- function(df, group) {
df %>% filter(party != group & elected == 0) %>% slice(1L) %>% pull(votes)
}
df %>%
group_by(party) %>%
mutate(new = get_opposite_votes(., first(party))) %>%
ungroup() %>%
#If needed to have NA values where elected = 0
mutate(new = replace(new, elected == 0, NA))
# party votes elected new
# <fct> <dbl> <dbl> <dbl>
#1 A 100 1 96
#2 A 99 1 96
#3 B 98 1 97
#4 A 97 0 NA
#5 B 96 0 NA
库(dplyr)
获取\u反对票%filter(party!=组&当选==0)%%>%slice(1L)%%>%pull(选票)
}
df%>%
(缔约方)分组%>%
变异(新=获得反对票(,第一(党))%>%
解组()%>%
#如果需要,则选择NA值=0
变异(新=替换(新,当选==0,NA))
#政党投票选出新成员
#
#1A 100 196
#2 A 99 1 96
#3 B 98 1 97
#4 A 97 0 NA
#5B960NA
逻辑是什么?如何用“挑战者候选人”标识行?可能有一种方法可以复制此数据的结果。但我认为,如果你能提供一个竞赛id,那么这个方法可能更具可复制性。例如,如果数据看起来更像这样:```所有观测值都属于同一个选举。挑战者候选人是第一位属于另一党派的未经选举产生的候选人。例如,第一排来自甲方,因此挑战者是来自不同政党(即B)的投票率最高的未经选举产生的候选人,该政党位于第5排。
library(dplyr)
get_opposite_votes <- function(df, group) {
df %>% filter(party != group & elected == 0) %>% slice(1L) %>% pull(votes)
}
df %>%
group_by(party) %>%
mutate(new = get_opposite_votes(., first(party))) %>%
ungroup() %>%
#If needed to have NA values where elected = 0
mutate(new = replace(new, elected == 0, NA))
# party votes elected new
# <fct> <dbl> <dbl> <dbl>
#1 A 100 1 96
#2 A 99 1 96
#3 B 98 1 97
#4 A 97 0 NA
#5 B 96 0 NA