Question

我需要使用什么功能对R程序中列表中前四个最常用的单词进行排名？

例如，

c("apple", "banana", "apple", "banana", "banana", 
  "desk", "pen", "pen", "pen", "pen")

使它像

"pen"
"banana"
"apple"
"desk"

谢谢

Answer 1

您可以按降序对表格值进行排序，然后使用名称来获取您要查找的输出。试试这个：

> x <- c("apple", "banana", "apple", "banana", "banana", 
         "desk", "pen", "pen", "pen", "pen")
> names(sort(table(x), decreasing = TRUE))
## [1] "pen"    "banana" "apple"  "desk"

Answer 2

table对于基础R来说很直观。这里是一个qdap方法：

library(qdap)
freq_terms(dat, 4)

##   WORD   FREQ
## 1 pen       4
## 2 banana    3
## 3 apple     2
## 4 desk      1

或者...

freq_terms(dat, 4)[, 1]
## [1] "pen"    "banana" "apple"  "desk"

Answer 3

一种有效的方法是：

按频率排序唯一值

3 个答案: