creating a binary variable in RStudio

Question

I am using the following code in R to create a new variable called success in my dataset (leaders)

leaders$success <- as.numeric(leaders$result == 'dies within a day after the attack','dies between a day and a week','dies between a week and a month','dies, timing unknown')

It happens that the code above only compute the variable dies within a day after the attack. How should a rephrase the code in order to compute the other three variables? I tried using the OR operator, | but It is possible only for numeric arguments.

Could someone help me?

Are you looking for `%in%` instead of `==` ? Like `1 %in% c(1,2,3)`? 'Or', as `|`, is definitely not only for numeric arguments either. It will combine any logical comparison `"a" == "b" | 1 == 1` for instance. — thelatemail, May 14 '20 at 03:15
Please include a reproducible question as suggested here [How to ask good question](https://stackoverflow.com/help/minimal-reproducible-example) and [Reproducible example](https://stackoverflow.com/questions/5963269/how-to-make-a-great-r-reproducible-example) include your data (as a dataframe object or use dput("yourdata"), the code you have tried and your expected output. This will make it more likely to get a good answer. — rj-nirbhay, May 14 '20 at 03:29
Yep, to provide further info: you are unintentionally doing `"string" | "other string"`. However, `|` and `&` are for making `logical` comparisons like `TRUE | FALSE` and `TRUE & TRUE`. Character strings have no way of being considered as `TRUE` or `FALSE` so R gives an error. — thelatemail, May 14 '20 at 03:39
Ronak solved the problem I was facing. Thank you very much guys — Andre Masuko, May 14 '20 at 03:44

score 0 · Accepted Answer · answered May 14 '20 at 04:02

== is used for element-wise comparison, if you want to compare multiple values use %in% and turn the values to numeric/integer.

leaders$success <- as.integer(leaders$result %in% 
   c('dies within a day after the attack','dies between a day and a week',
   'dies between a week and a month','dies, timing unknown'))

score 0 · Answer 2 · answered May 18 '20 at 20:03

0

We can also use + to coerce the logical to binary

leaders$success <- +(leaders$result %in% 
  c('dies within a day after the attack','dies between a day and a week',
   'dies between a week and a month','dies, timing unknown'))

answered May 18 '20 at 20:03

akrun

789,025
32
460
575

creating a binary variable in RStudio

2 Answers2