Create variables and fill in information from other variables

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Software R. I would like to know how to create variables through information contained in one variable and then populate with information that is in two other variables. Example

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asked by anonymous 17.07.2018 / 03:10

1 answer

4

The reshape2::dcast function does what it needs. You only have to run it once for each semester and merge the data: 

dados <- data.frame(
  id = c(rep(9039, 2), rep(8234, 2)),
  semestre_1 = paste(1, 2018:2017, sep = '_'),
  semestre_2 = paste(2, 2018:2017, sep = '_'),
  para_1s = 1:4,
  para_2s = 5:8
)

> dados
    id semestre_1 semestre_2 para_1s para_2s
1 9039     1_2018     2_2018       1       5
2 9039     1_2017     2_2017       2       6
3 8234     1_2018     2_2018       3       7
4 8234     1_2017     2_2017       4       8

library(reshape2)
sem1 <- dcast(dados, id ~ semestre_1, value.var = 'para_1s')
sem2 <- dcast(dados, id ~ semestre_2, value.var = 'para_2s')

> merge(sem1, sem2)
    id 1_2017 1_2018 2_2017 2_2018
1 8234      4      3      8      7
2 9039      2      1      6      5
    
17.07.2018 / 05:33
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