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随着组R的变化,在不同大小的窗口上滚动求和

[英]Rolling sums over different size windows with changing groups R

我已经在该网站上阅读了有关滚动汇总的所有问答,但是我无法理解大多数复杂的代码,因此我的调整技能受到限制。 我尝试实施此处此处此处提出的一些解决方案,但是即使我仅使用1,000行和3列,也可能会出错或计算机崩溃。 因此,很明显,我弄乱了代码。

我的数据看起来像这样(通过dput的前50行)。 数据集总数约为100,000行

           structure(list(pnum = c("4778744", "4778744", "4778744", "4832724", 
"4840655", "4854957", "4952026", "4832724", "4832724", "4840655", 
"4952026", "4854957", "4952026", "4979975", "5062877", "5062877", 
"4979975", "4979975", "4979975", "5093287", "5148510", "5093287", 
"5148510", "5093287", "5148510", "5093287", "5148510", "5093287", 
"5148510", "5093287", "5148510", "5093287", "5148510", "5212120", 
"5375012", "5168079", "5375012", "5212120", "5212120", "5168079", 
"4811345", "4851990", "4947366", "5142672", "5317715", "4878166", 
"4851990", "5142672", "5317715", "4878166", "5142672", "5317715", 
"4878166", "5142672", "5317715", "4878166", "5142672", "5317715", 
"4878166", "5185878", "4926323", "4926323", "4926323", "4926323", 
"5185878", "4926323", "4926323", "4926323", "4926323", "4926323", 
"4926323", "5129067", "5136697", "5210841", "5237700", "5237700", 
"5237700", "5247644", "5805912", "5828869", "5357626", "5247644", 
"5805912", "5828869", "5357626"), ID = c("03859643-1", "04488864-4", 
"04560399-1", "03859643-1", "03859643-1", "03859643-1", "03859643-1", 
"03901719-2", "04086089-2", "04086089-2", "04407934-2", "04488864-4", 
"04952026-3", "03859643-1", "03859643-1", "03901719-2", "03912481-3", 
"03940277-1", "04979975-2", "03859643-1", "03859643-1", "03864113-1", 
"03864113-1", "04877300-1", "04877300-1", "04877300-3", "04877300-3", 
"05040862-3", "05040862-3", "05093287-4", "05093287-4", "05093287-6", 
"05093287-6", "03859643-1", "03859643-1", "03859643-1", "03870399-2", 
"03901719-2", "03923529-1", "04784976-1", "03860454-2", "03860454-2", 
"03860454-2", "03860454-2", "03860454-2", "03860454-2", "04761567-2", 
"04870622-2", "04870622-2", "04870622-2", "04878166-2", "04878166-2", 
"04878166-2", "04878166-3", "04878166-3", "04878166-3", "04878166-5", 
"04878166-5", "04878166-5", "03860454-2", "03860454-2", "04610004-1", 
"04734852-2", "04734852-3", "04761567-2", "04761567-2", "04777587-1", 
"04835414-1", "04878166-2", "04926323-10", "04926323-5", "03860454-2", 
"03860454-2", "03860454-2", "03860454-2", "05237700-2", "05237700-3", 
"03860454-2", "03860454-2", "03860454-2", "03860454-2", "04731737-1", 
"04731737-1", "04731737-1", "04731737-1"), Time = c(1986L, 1986L, 
1986L, 1988L, 1988L, 1988L, 1988L, 1988L, 1988L, 1988L, 1988L, 
1988L, 1988L, 1989L, 1989L, 1989L, 1989L, 1989L, 1989L, 1990L, 
1990L, 1990L, 1990L, 1990L, 1990L, 1990L, 1990L, 1990L, 1990L, 
1990L, 1990L, 1990L, 1990L, 1991L, 1991L, 1991L, 1991L, 1991L, 
1991L, 1991L, 1986L, 1987L, 1987L, 1987L, 1987L, 1987L, 1987L, 
1987L, 1987L, 1987L, 1987L, 1987L, 1987L, 1987L, 1987L, 1987L, 
1987L, 1987L, 1987L, 1988L, 1988L, 1988L, 1988L, 1988L, 1988L, 
1988L, 1988L, 1988L, 1988L, 1988L, 1988L, 1989L, 1989L, 1990L, 
1990L, 1990L, 1990L, 1991L, 1991L, 1991L, 1991L, 1991L, 1991L, 
1991L, 1991L)), .Names = c("pnum", "inventor", "pryear"), row.names = c(1L, 
2L, 3L, 4L, 5L, 6L, 7L, 8L, 9L, 10L, 11L, 12L, 13L, 14L, 15L, 
16L, 17L, 18L, 19L, 20L, 21L, 22L, 23L, 24L, 25L, 26L, 27L, 28L, 
29L, 30L, 31L, 32L, 33L, 34L, 35L, 36L, 37L, 38L, 39L, 40L, 325L, 
326L, 327L, 328L, 329L, 330L, 331L, 332L, 333L, 334L, 335L, 336L, 
337L, 338L, 339L, 340L, 341L, 342L, 343L, 344L, 345L, 346L, 347L, 
348L, 349L, 350L, 351L, 352L, 353L, 354L, 355L, 356L, 357L, 358L, 
359L, 360L, 361L, 362L, 363L, 364L, 365L, 366L, 367L, 368L, 369L
), class = "data.frame")

多个inventors在特定年份pryear进行项目pnum合作。 我在寻找三件事:

在@Thierry发表评论后,我更改了数据样本,以确保解决了他指出的问题。

  1. 每个发明人在当前pryear年之前的x(例如3)年窗口中进行的项目pryear ,因此,如果当前项目的年份为1977,我希望包括1974年至1976年之间进行的项目数量。 如果以前没有发生过,理想的结果是“ 0”。 @Alex 在此处提供的答案可用于实现第一个目标。 但是,正如评论中所讨论的那样,它的效率不是很高(特别是因为我的时间范围是1952年至2010年,拥有超过50,000名发明者)。
  2. 每个发明人在同一时间窗口内与之合作的不同发明人的总数
  3. 如果一个项目有多个发明人,我正在寻找每个发明人在过去的相同时间范围内与正在研究当前项目的其他发明人合作的次数

这是您第一个问题的解决方案。 您可以通过练习解决其他问题。

第一个解决方案仅使用dplyr 您可能会遇到大型数据集的问题。

library(dplyr)
df %>% 
  inner_join(
    df %>% 
      select(inventor, oldyear = pryear), 
    by = "inventor") %>% 
  filter(pryear - 3 <= oldyear, oldyear < pryear) %>% 
  group_by(inventor, pryear) %>% 
  summarise(projects = n())

第二种解决方案将dplyr与数据库后端一起使用。 那应该能够应付更大的数据集。 请注意,代码非常相似。

library(RSQLite)
library(dplyr)
conn <- dbConnect(SQLite(), "test")
dbWriteTable(conn, "project", df)
src <- src_sqlite("test")
tbl(src, "project") %>% 
  inner_join(
    tbl(src, "project") %>% 
      select(inventor, oldyear = pryear), 
    by = "inventor") %>% 
  filter(pryear - 3 <= oldyear, oldyear < pryear) %>% 
  group_by(inventor, pryear) %>% 
  summarise(projects = n()) %>% 
  collect()

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