i have a rather specific question: how can I make a string into a factor and set its contrasts within a pipe ?
Let's say that I have a tibble like the following
tib <- data_frame (a = rep(c("a","b","c"),3, each = T), val = rnorm(9))
Now, I could use then two separate lines
tib$a <- factor(tib$a)
contrasts(tib$a) <- contr.sum(3)
But what If I wanted to perform the same actions within a pipe from dplyr ?