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RE: st: Looping Enquiry


From   Valerie Orozco <Valerie.Orozco@toulouse.inra.fr>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   RE: st: Looping Enquiry
Date   Thu, 29 Sep 2011 13:55:22 +0000

Dear George,

The first idea that comes in my mind is to transform the problem.
If you think in a sum rather than in a product it will be easier to program it.
Indeed,  since the logarithm of a product is the sum of the logarithms, you can use it to program you formula easier in Stata.

score	transform to log	generate a cumulative sum	transform to exponential to have what you want 
x1	lnx1	                                         lnx1	                                                  x1
x2	lnx2	                                         lnx1+lnx2	                                                     x1x2
x3	lnx3	                                                  lnx1+lnx2+lnx3	              x1x2x3

Hope this helps.

valérie

-------------------------------
Valérie OROZCO
Toulouse School of Economics (INRA-GREMAQ)
21, allée de Brienne
F-31000 Toulouse, France

MF 219
+33 5 61 12 85 91
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