Recode/relevel data.frame factors with different levels

Question

Each time when I have to recode some set of variables, I have SPSS recode function in mind. I must admit that it\'s quite straightforward. There\'s a similar recode

Answer 1

If you complete the factor levels you're good to go:

df <- data.frame(x=factor(c(2,4,5,6)))
df$x <- factor(df$x, levels = 7:1)
table(df$x)

7 6 5 4 3 2 1 
0 1 1 1 0 1 0