对如何将这个数据框从长到宽重塑感到困惑

Question

我需要将数据框从长改成宽。我想重塑几个变量，但也想保持数据框其余部分的格式。我有一个数据框，其中包含几年的种族、五分位数和收入。

df <- structure(list(year = c(2019, 2019, 2019, 2018, 2018, 2018), race = c("Black Alone","Black Alone", "Black Alone", "Black Alone", "Black Alone", "Black Alone"), quintile = c("Lowest", "Middle", "Highest", "Lowest", "Middle", "Highest"), income = c(8680, 45356, 177659, 7657, 42202, 155520)), row.names = c(NA, -6L), class = c("tbl_df", "tbl", "data.frame"))

数据帧df如下所示：

year  race         quintile  income
2019  Black Alone  Lowest    8680
2019  Black Alone  Middle    45356
2019  Black Alone  Highest   177659
2018  Black Alone  Lowest    7657
2018  Black Alone  Middle    42202
2018  Black Alone  Highest   155520

我希望数据框看起来像：

year  race         Lowest_income  Middle_income  Highest_income
2019  Black Alone  8680           45356          177659
2018  Black Alone  7657           42202          155520

我不知道从哪里开始来完成这个。如有任何帮助，我们将不胜感激！

Answer 1

我们可以使用

library(dplyr)
library(tidyr)
library(stringr)
df %>% 
   mutate(quintile = str_c(quintile, '_income')) %>%
   pivot_wider(names_from = 'quintile', values_from = income)

-输出

# A tibble: 2 x 5
#   year race        Lowest_income Middle_income Highest_income
#  <dbl> <chr>               <dbl>         <dbl>          <dbl>
#1  2019 Black Alone          8680         45356         177659
#2  2018 Black Alone          7657         42202         155520

对如何将这个数据框从长到宽重塑感到困惑

Stumped on how to reshape this dataframe from long to wide

r

reshape

dataframe

tidyr