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st: Re: First non-zero observation within a variable


From   "Michael Blasnik" <michael.blasnik@verizon.net>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: Re: First non-zero observation within a variable
Date   Sun, 04 Feb 2007 11:36:04 -0500

...
I just have to chime in on this one since I haven't seen anyone mention a simple one line solution:

bysort group (time): drop if sum(expression!=0 & expression<.)==0

Michael Blasnik

----- Original Message ----- From: "Thomas Speidel" <thomas@tmbx.com>
To: <statalist@hsphsun2.harvard.edu>
Sent: Sunday, February 04, 2007 12:38 AM
Subject: st: First non-zero observation within a variable



I am trying to tag the first non-zero, non-missing observation within a
variable by group.  The goal is to drop anything BEFORE the expression
is measured within a group.  For example:
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