Hi All!
   
  I have a table (see attached shortened example). Here the columns represent the samples (two here) and the rows the probe pairs. 16 probe pair represent a probe set (however, some probe sets contain only 11 or 14 probe pairs!). I would like to divide the probe pairs by the average of a probe set. 

  How can I do this?
   
(I am looking for splice variants, therefore the actual expression of the gene is not important, but the expression of a given probe pair compared to the whole gene set. I cannot go back to the raw data as the table represents already pre-processed data.)

  Thank you:
  Balazs
  
----------------------
   
   SAMPLE1 SAMPLE2
1007_s_at1 20 119.1413
1007_s_at2 20 20
1007_s_at3 20 20
1007_s_at4 20 20
1007_s_at5 1122.83448 1503.4413
1007_s_at6 477.13448 1868.9413
1007_s_at7 29.83448 458.9413
1007_s_at8 20 136.6413
1007_s_at9 20 305.3413
1007_s_at10 373.53448 1567.3413
1007_s_at11 340.83448 596.6413
1007_s_at12 68.83448 293.6413
1007_s_at13 184.83448 673.9413
1007_s_at14 20 20
1007_s_at15 20 72.6413
1007_s_at16 20 124.1413
1487_at1 65.33448 20
1487_at2 20 20
1487_at3 20 20
1487_at4 1664.53448 993.9413
1487_at5 1981.13448 1566.8413
1487_at6 20 20
1487_at7 38.53448 20
1487_at8 20 20
1487_at9 20 20
1487_at10 20 20
1487_at11 91.33448 20
1487_at12 581.33448 800.4413
1487_at13 49.03448 200.9413
1487_at14 20 80.6413
   
  --------------------------------------


-------------------------
Balázs GYÖRFFY MD, PhD
Children's Hospital Boston Informatics Program
Harvard-MIT Health Sciences and Technology
300 Longwood Avenue, Boston, USA
Enders 150.6
Tel: +1 617 919 2654

       
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