How do I create a dummy variable in R based on a dataset's median?

Question

My data has a median of 60. I'd like to create a dummy variable where 1 = >60 and 0 = <60.

For you data (vector) `x`, do `as.integer(x > median(x))` – Zheyuan Li Dec 01 '16 at 04:42 — Zheyuan Li, Dec 01 '16 at 04:42

golden_truth · Answer 1 · 2016-12-01T05:03:23.813

2

You can use ifelse function.

a = 1:100

median = 60

ifelse(a >= median, 1, 0)

If you use data frame for this problem use dplyr(0.5.0) is more efficient.

a = data.frame(col1 = 1:100)



a %>% mutate(dummy = case_when(.$col1 >= 60 ~ 1,
                               .$col1 < 60 ~ 0))

edited Dec 01 '16 at 05:03

answered Dec 01 '16 at 04:51

golden_truth

1 Answers1