[英]Conditional running count (cumulative sum) with reset in R (dplyr)
我正在嘗試計算一個以其他變量為條件的運行計數(即累計總和),並且可以針對另一個變量的特定值進行重置。 我正在R中工作,如果可能的話,希望使用基於dplyr
的解決方案。
我想根據以下算法為運行計數( cumulative
創建一個變量:
id
和age
組合中計算運行計數( cumulative
) trial
運行計數( cumulative
)加1( accuracy = 0
, block = 2
且condition = 1
trial
運行計數( cumulative
)重置為0,其中accuracy = 1
, block = 2
, condition = 1
,下一個增量恢復為1(而不是先前的數字) block != 2
或condition != 1
每個trial
,將運行計數( cumulative
)保留為NA
這是一個最小的工作示例:
mydata <- data.frame(id = c(1,1,1,1,1,1,1,1,1,1,1),
age = c(1,1,1,1,1,1,1,1,1,1,2),
block = c(1,1,2,2,2,2,2,2,2,2,2),
trial = c(1,2,1,2,3,4,5,6,7,8,1),
condition = c(1,1,1,1,1,2,1,1,1,1,1),
accuracy = c(0,0,0,0,0,0,0,1,0,0,0)
)
id age block trial condition accuracy
1 1 1 1 1 0
1 1 1 2 1 0
1 1 2 1 1 0
1 1 2 2 1 0
1 1 2 3 1 0
1 1 2 4 2 0
1 1 2 5 1 0
1 1 2 6 1 1
1 1 2 7 1 0
1 1 2 8 1 0
1 2 2 1 1 0
預期的輸出是:
id age block trial condition accuracy cumulative
1 1 1 1 1 0 NA
1 1 1 2 1 0 NA
1 1 2 1 1 0 1
1 1 2 2 1 0 2
1 1 2 3 1 0 3
1 1 2 4 2 0 NA
1 1 2 5 1 0 4
1 1 2 6 1 1 0
1 1 2 7 1 0 1
1 1 2 8 1 0 2
1 2 2 1 1 0 1
我們可以使用case_when
根據我們的條件分配所需的值。 然后,我們添加一個額外的group_by
條件,使用cumsum
在temp
cumsum
0時切換值。在最后的mutate
步驟中,我們replace
temp
NA
值臨時replace
為0,然后對其進行cumsum
,然后將NA
值再次放回原處最終輸出。
library(dplyr)
mydata %>%
group_by(id, age) %>%
mutate(temp = case_when(accuracy == 0 & block == 2 & condition == 1 ~ 1,
accuracy == 1 & block == 2 & condition == 1 ~ 0,
TRUE ~ NA_real_)) %>%
ungroup() %>%
group_by(id, age, group = cumsum(replace(temp == 0, is.na(temp), 0))) %>%
mutate(cumulative = replace(cumsum(replace(temp, is.na(temp), 0)),
is.na(temp), NA)) %>%
select(-temp, -group)
# group id age block trial condition accuracy cumulative
# <dbl> <dbl> <dbl> <dbl> <dbl> <dbl> <dbl> <dbl>
# 1 0 1 1 1 1 1 0 NA
# 2 0 1 1 1 2 1 0 NA
# 3 0 1 1 2 1 1 0 1
# 4 0 1 1 2 2 1 0 2
# 5 0 1 1 2 3 1 0 3
# 6 0 1 1 2 4 2 0 NA
# 7 0 1 1 2 5 1 0 4
# 8 1 1 1 2 6 1 1 0
# 9 1 1 1 2 7 1 0 1
#10 1 1 1 2 8 1 0 2
#11 1 1 2 2 1 1 0 1
這是使用data.table
的選項。 創建一個二進制列,其基礎是將paste
d值“ accuracy”,“ block”,“ condition”與自定義值match
,並按二進制列的run-length-id(“ ind”),“ id”分組'和'age',獲取'ind'的累加總和,並將其分配( :=
)到新列中('Cumulative')
library(data.table)
setDT(mydata)[, ind := match(do.call(paste0, .SD), c("121", "021")) - 1,
.SDcols = c("accuracy", "block", "condition")
][, Cumulative := cumsum(ind), .(rleid(ind), id, age)
][, ind := NULL][]
# id age block trial condition accuracy Cumulative
# 1: 1 1 1 1 1 0 NA
# 2: 1 1 1 2 1 0 NA
# 3: 1 1 2 1 1 0 1
# 4: 1 1 2 2 1 0 2
# 5: 1 1 2 3 1 0 3
# 6: 1 1 2 4 2 0 NA
# 7: 1 1 2 5 1 1 0
# 8: 1 1 2 6 1 0 1
# 9: 1 1 2 7 1 0 2
#10: 1 2 2 1 1 0 1
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