将分类变量转换为数字

Question

我有一个分类变量educa需要转换为数字以便于阅读。 educa可以承担6个值。我想将它们转换为1-6。我该怎么做呢？这不起作用：

brfs2013educationsummarycleaned <- 
    brfs2013educationsummary %>% 
    mutate(
    educa_level = ifelse(educa == "Never attended school or only kindergarten", 1, educat == "Grades 1 through 8 (Elementary)", 2, "not a real category"))

我做错了什么？以上是我打算做的一部分。

Answer 1

 as.numeric(educa)

会做你想要的，如果你想要它作为新列

 brfs2013educationsummarycleaned <- 
         brfs2013educationsummary %>% 
         mutate(educa_level = as.numeric(educa))

Answer 2

如果'educa'中的值必须根据它们在数据中出现的顺序进行转换，我们可以使用match

library(tidyverse)
brfs2013educationsummary %>%
           mutate(educa_level = match(educa, unique(educa)))