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st: RE: RE: Percent of time a


From   Howard Lempel <HLempel@brookings.edu>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   st: RE: RE: Percent of time a
Date   Tue, 10 Feb 2009 15:45:57 -0500

Nick,

My language was imprecise.  I do not have a time series, but rather want to know in what proportion of weighted observations my condition holds.  

That being said, -_gwtmean- does do what I want, albeit by creating an extra variable, which is easy enough to drop.

Thanks!
Howie


-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Nick Cox
Sent: Tuesday, February 10, 2009 3:24 PM
To: statalist@hsphsun2.harvard.edu
Subject: st: RE: Percent of time a

I interpret this as meaning that you have time series data with
regularly spaced observations. If that's not true, what follows will
need modification. 

You need a weighted mean of an expression that would produce an
indicator variable. David Kantor's _gwtmean function for -egen- from SSC
will do that, but I don't know a command that will do this without
generating a new variable, but it's programmable. 

Nick 
n.j.cox@durham.ac.uk 

Howard Lempel

Is there a command that will give me the proportion of the time a
variable is equal to a certain value?  The command must accept weights.
I'm looking for something like -tabcond-, from SSC, but that returns
proportions as well as counts.

One option would be to -generate- a dummy equal to 1 when my variable is
equal to my value and zero otherwise and then to use -svy: mean-, but I
would prefer something that can be done in one line (and without
generating a new variable).  My variable is continuous, so I don't want
to -svy: tab- the whole thing.


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