Reshaping data frame with duplicates

Question

I have what should be a simple reshaping problem, but I can\'t figure it out. Part of my data looks like this:

foo <- structure(list(grade = c(3, 3, 4, 4,         


        

Answer 1

It is not as pretty as reshape, but

data.frame(grade = foo[2 * (1:(nrow(foo)/2)),]$grade, 
           SS =  foo[foo$var.type == "SS", ]$var.val, 
           SE =  foo[foo$var.type == "SE", ]$var.val ) 

produces

   grade  SS SE
1      3 120 47
2      4 120 46
3      5 120 46
4      6 120 47
5      7 120 46
6      8 120 46
7      3 120 12
8      4 120 14
9      5 120 16
10     6 120 20

You have to assume the data comes in pairs of rows for this.