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st: drop range of variables meeting condition in another variable

From   "Tamer Farag" <>
To   "Statalist" <>
Subject   st: drop range of variables meeting condition in another variable
Date   Mon, 18 Mar 2013 15:53:02 -0400

Dear All,

I am working with a case control dataset with gene clusters variables.  I have approx 100 observations, a handful of essential variables, but approx. 14,000 variables for each observation that represent gene clusters (absent/present, 0/1).  The gene variables are all located next to each other in the dataset (i.e., gene1-gene14000).

I would like to drop variables for gene clusters that are not present among my cases.  Obviously, specifying each gene cluster variable would be impractical.

Is there any way to do this in Stata?  I'm stumped.

Many thanks,

Tamer H. Farag, Ph.D.
Research Associate Epidemiologist
Center for Vaccine Development
University of Maryland School of Medicine
685 W. Baltimore Street, HSF 480
Baltimore, Maryland  21201, USA
Office. +1 410 706-8439
Mobile.  +1 410 818-9654
Fax. +1 410 706-6205

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