st: any idea?

["Y.R.E. Retamal" <yrer2@cam.ac.uk>]

Dear list

I am very complicated trying to perform an analysis using STATA and I 
cannot find the way. Maybe you could help me. I want to create some new 
variables containing the difference between the length of two 
individuals from different groups:

id     side     length      newvar1       newvar2      newvar3
1      right      x           x-j           x-k          x-l
2      right      y           y-j           y-k          y-l
3      right      z           z-j           z-k          z-l
4      left       j           j-x           j-y          j-z
5      left       k           k-x           k-y          k-z
6      left       l           l-x           l-y          l-z


I do not know if I do explain myself clearly, the individuals are bones 
(clavicles, for example), so it is possible that some right clavicles 
pair-match with left clavicles, following the idea that an individual 
has bone of similar length.

Any help could bring me a light!
Best wishes

Rodrigo
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