面板数据 (R) 中变量 t 相对于 t-1 的数学运算

Question

我有一个平衡的面板数据，其中每年记录 ID (cnpjcei)，显示给定公司的雇员总数。我的目标是考虑数据库中所有年份 (t) 中的员工和 (t-1) 中的员工之间的差异（以防万一，empreg(t) - empreg(t-1)）

# A tibble: 386,763 x 3
     ano cnpjcei       empreg
   <dbl> <chr>          <dbl>
 1  2006 1000786001505     10
 2  2007 1000786001505     12
 3  2008 1000786001505     16
 4  2009 1000786001505     19
 5  2010 1000786001505      7
 6  2011 1000786001505      7
 7  2012 1000786001505      7
 8  2013 1000786001505      7
 9  2014 1000786001505      8
10  2015 1000786001505      9
# ... with 386,753 more rows

像这样：


# A tibble: 386,763 x 4
     ano cnpjcei       empreg    variation_empreg
   <dbl> <chr>          <dbl>
 1  2006 1000786001505     10           
 2  2007 1000786001505     12            2
 3  2008 1000786001505     16            4
 4  2009 1000786001505     19            3
 5  2010 1000786001505      7           -12
 6  2011 1000786001505      7            0
 7  2012 1000786001505      7            0
 8  2013 1000786001505      7            0
 9  2014 1000786001505      8            1
10  2015 1000786001505      9            1
# ... with 386,753 more rows

有人有什么想法吗？谢谢:)

Answer 1

您可以使用 diff:

library(dplyr)

df %>% mutate(variation_empreg = c(NA, diff(empreg)))
#>     ano       cnpjcei empreg variation_empreg
#> 1  2006 1000786001505     10               NA
#> 2  2007 1000786001505     12                2
#> 3  2008 1000786001505     16                4
#> 4  2009 1000786001505     19                3
#> 5  2010 1000786001505      7              -12
#> 6  2011 1000786001505      7                0
#> 7  2012 1000786001505      7                0
#> 8  2013 1000786001505      7                0
#> 9  2014 1000786001505      8                1
#> 10 2015 1000786001505      9                1

数据

df <- structure(list(ano = 2006:2015, cnpjcei = c("1000786001505", 
"1000786001505", "1000786001505", "1000786001505", "1000786001505", 
"1000786001505", "1000786001505", "1000786001505", "1000786001505", 
"1000786001505"), empreg = c(10L, 12L, 16L, 19L, 7L, 7L, 7L, 
7L, 8L, 9L)), row.names = c("1", "2", "3", "4", "5", "6", "7", 
"8", "9", "10"), class = "data.frame")

面板数据 (R) 中变量 t 相对于 t-1 的数学运算

Mathematical operation of a variable at t with respect to t-1 in panel data (R)

r

dplyr

tidyverse

panel-data