Im trying to modify some data and have the following data now:
df <- data.frame(year = c(2010,2011,2010,2011),A = c(10,11,10,11),B = c(11,12,11,12))
year A B
1 2010 10 11
2 2011 11 12
3 2010 10 11
4 2011 11 12
I want it to look like this, but do not know how to do it. Can anyone help me?
company year Variable
1 A 2010 10
2 A 2011 11
3 B 2010 11
4 B 2011 12