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st: two STATA questions

From   "Ni Frank" <>
Subject   st: two STATA questions
Date   Mon, 26 Feb 2007 20:11:15 -0500

Hi, I have two basic questions on STATA.
1) There are 50 varialbes, w05100, w05200,....,w10000. We want to DROP those obversations for which at least one of the above variables takes value of 0. When I use "drop if w*==0, it said "W* invalid name". Does anybody know what's wrong?

2) Now, if we want to KEEP those obersvations for which at least one of the variables w05100, w05200, ....,w09900 takes value of 0. How to do that?

Thanks a lot!

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