CODEWITHSUNDEEP
rcategorical-datadummy-variable
Callie Silver
Callie Silver

Reputation: 25

Combining 2 dummy variables

I have 2 dummy variables and I would like to combine them in a way such that I have a new variable that puts a 1 if either Variable A or B had a 1.

e.g.

Variable A: 0 0 0 1 1

Variable B: 1 0 1 0 1

Variable C (ideally): 1 0 1 1 1

Any help is greatly appreciated! I know this is pretty simple.. getting back into R and feeling rusty!

Upvotes: 0

Views: 512

Answers (1)

Dubukay
Dubukay

Reputation: 2071

We can do this with logical comparisons! The best one in this case is the OR operator, the pipe: |

set.seed(1234)

var_a <- round(runif(10))
var_b <- round(runif(10))

var_c <- var_a|var_b

rbind(var_a, var_b, var_c)

enter image description here

This works because R automagically coerces the numeric 0 and 1s into logical FALSE and TRUE, which we then compare using OR before automagically coercing back into numeric.

Welcome back to R!

Upvotes: 1

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