[英]Count observations at any given date
我正在使用類似於以下內容的數據集:
df <- data.frame(type = c("A", "A", "A", "A", "A", "B", "B", "B", "C", "D", "D", "D"),
start_date = as.Date(c("2010-02-01", "2011-03-15", "2011-09-15", "2015-01-01", "2015-05-15", "2009-01-01", "2015-07-14", "2016-06-30", "2012-01-15", "2010-04-05", "2010-08-01", "2012-04-01"), format = "%Y-%m-%d"),
end_date = as.Date(c("2010-12-31", "2011-07-31", "2014-04-04", "2015-02-15", "2016-12-15", "2013-02-16", "2015-12-31", "2016-12-31", "2015-09-17", "2010-04-10", "2010-09-30", "2013-12-31"), format = "%Y-%m-%d"))
我想計算任何給定日期的觀察次數。
預期輸出
從本質上講,我希望我的結果表明只有一種type
到 2010-02-01,然后兩種到 2010-04-05,然后三種到 2010-04-10 等等,即一列帶有日期(每行day) 和一列type
.
date count_of_type
2009-01-01 1
2009-01-02 1
2009-01-03 1
...
2010-01-31 1
2010-02-01 2
2010-02-02 2
...
2010-04-04 2
2010-04-05 3
2010-04-06 3
2010-04-07 3
2010-04-08 3
2010-04-09 3
2010-04-10 2
2010-04-11 2
...
我認為這很容易做到,但無法弄清楚......知道嗎?
干杯,
一種選擇是transmute
通過采取相應的seq
由“起始日期”,“END_DATE”的uence day
,然后拿到count
library(tidyverse)
df %>%
transmute(date = map2(start_date, end_date, seq, by = '1 day')) %>%
unnest %>%
count(date)
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