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tdlong
2013 Jan 22
1
simple reshape
Dear friends - this is a very simple question - I have a data frame
'data.frame': 87 obs. of 3 variables:
$ ID : int 1 1 1 2 2 2 3 3 3 4 ...
$ prep : num 1.18 1.38 1.34 1.93 2.38 2.24 1.17 1.13 1.21 1.89 ...
$ postp: num 0.63 0.71 0.75 1.01 1.12 1.07 0.87 0.64 0.7 0.8 ...
- 29 persons (ID) each measured three times before and after an
intervention: prep and postp -
I need