如何通过 2+ 条件自定义因子变量的订单级别？

Question

   STP_name                                                           PCT
   <fct>                                                            <dbl>
 1 ENGLAND                                                           2.58
 2 MIDLANDS AND EAST OF ENGLAND                                      2.64
 3 LEICESTER, LEICESTERSHIRE AND RUTLAND STP                         2.31
 4 BATH, SWINDON AND WILTSHIRE STP                                   2.94
 5 KENT AND MEDWAY STP                                               2.8 
 6 BUCKINGHAMSHIRE, OXFORDSHIRE AND BERKSHIRE WEST STP               2.73
 7 NORTH CENTRAL LONDON STP                                          1.93
 8 NORTHAMPTONSHIRE STP                                              2.63
 9 SOMERSET STP                                                      3.41
10 SURREY HEARTLANDS STP                                             2.87

我想按 PCT 中的降序值对 STP_name 因子变量进行排序，但是我希望 ENGLAND 和 MIDLANDS AND EAST OF ENGLAND 的行出现在因子水平的开始，不管它们的 PCT 值如何。

理想情况下寻找 forcats 解决方案，但基础很好。

Answer 1

假设数据集有全部unique 'STP_name'，根据[=23=的order，将其改为factor，指定levels ] 然后在开头添加两个级别 ("ENGLAND", ""MIDLANDS AND EAST OF ENGLAND") relevel 或 fct_relevel (from forcats)

library(tidyverse)
library(forcats)
df1 %>%
    mutate(STP_name = fct_relevel(factor(STP_name, levels = STP_name[order(-PCT)]), 
              c("ENGLAND",  "MIDLANDS AND EAST OF ENGLAND")))

如何通过 2+ 条件自定义因子变量的订单级别？

How to custom order levels of a factor variable by 2+ conditions?

r

forcats