如何在R中的数据框的列中查找属于特定范围的项目数

Question

我有以下数据框：

id weekly_sale
1    40000
2    120000
3    135000
4    211000
5    215000
6    331000
7    337000

我有以下范围：

under 100000
between 100000 and 200000
between 200000 and 300000
more than 300000

他们可以被视为一个载体：

c(0,100000,200000,300000)

我需要计算落入每个范围的值并生成如下数据框：

 under_100000   between_100000_and_200000  between_200000_and_300000   more_than_300000
 1                   2                       2                          2

Answer 1

我们可以使用cut创建分组，然后使用table获取频率。

 with(df1, table(cut(weekly_sale, breaks = c(-Inf,100000, 200000, 
         300000, Inf), labels = c("under 100000", "between 100000 and 200000", 
           "between 200000 and 300000", "more than 300000"))))
 # under 100000 between 100000 and 200000 between 200000 and 300000          more than 300000 
     1                               2                              2                         2