显示与条件对应的变量和数量

【问题标题】：Display which and how many variables correspond to conditions显示与条件对应的变量和数量
【发布时间】：2021-11-25 12:13:50
【问题描述】：

我有一个数据集，分为乘客姓名和他们的状态（假设，10 个类别），如下所示。

Passenger	Status
Peter	Captain
Mary	Mrs.
Claudette	Mrs.
Marius	Doc.
Holmes	Mr.
...	...

ecc.

在 R 中，如何显示有多少乘客以特定状态为特征以及谁？我想到了一个表格，它代表“n 名乘客进入“夫人”类别，他们的名字是“Claudette, Mary ecc”。

（我不需要完整的字符串消息，只需要数字和他们的名字）

我该怎么做？

【问题讨论】：

标签： r dataset classification categories data-manipulation

【解决方案1】：

只需使用dplyr

dummy <- read.table(text = "Passenger   Status
Peter   Captain
Mary    Mrs.
Claudette   Mrs.
Marius  Doc.
Holmes  Mr.", header = T)

dummy %>%
  group_by(Status) %>%
  summarise(n = n(),
            names = paste0(Passenger, collapse = ", ")) %>%
  mutate(res = paste0(n, ' passengers into the ', Status, "category and their names are ", names))

  Status      n names           res                                                                   
  <chr>   <int> <chr>           <chr>                                                                 
1 Captain     1 Peter           1 passengers into the Captaincategory and their names are Peter       
2 Doc.        1 Marius          1 passengers into the Doc.category and their names are Marius         
3 Mr.         1 Holmes          1 passengers into the Mr.category and their names are Holmes          
4 Mrs.        2 Mary, Claudette 2 passengers into the Mrs.category and their names are Mary, Claudette

【讨论】：