R-dplyr汇总并保留其他列 [英] R - dplyr Summarize and Retain Other Columns

问题描述

我正在对数据进行分组，然后对其进行汇总，但也想保留另一列。我不需要对该列的内容进行任何评估，因为它将始终与group_by列相同。我可以将其添加到group_by语句中，但这似乎并不正确。我想按 State 分组后保留 State.Full.Name 。谢谢

I am grouping data and then summarizing it, but would also like to retain another column. I do not need to do any evaluations of that column's content as it will always be the same as the group_by column. I can add it to the group_by statement but that does not seem "right". I want to retain State.Full.Name after grouping by State. Thanks

TDAAtest <- data.frame(State=sample(state.abb,1000,replace=TRUE))
TDAAtest$State.Full.Name <- state.name[match(TDAAtest$State,state.abb)]


TDAA.states <- TDAAtest %>%
  filter(!is.na(State)) %>%
  group_by(State) %>%
  summarize(n=n()) %>%
  ungroup() %>%
  arrange(State)

推荐答案

也许我们需要

TDAAtest %>% 
     filter(!is.na(State)) %>%
     group_by(State) %>% 
     summarise(State.Full.Name = first(State.Full.Name), n = n())

---

或使用 mutate 创建列，然后执行与众不同

TDAAtest %>% f
     filter(!is.na(State)) %>%
     group_by(State) %>% 
     mutate(n= n()) %>% 
     distinct(State, .keep_all=TRUE)

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