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Re: st: linear interpolation


From   smerryman@kc.rr.com
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: linear interpolation
Date   Tue, 25 Jul 2006 16:00:09 -0500

----- Original Message -----
From: Scott Cunningham <scunning@gmail.com>
Date: Tuesday, July 25, 2006 3:46 pm
Subject: Re: st: linear interpolation
To: statalist@hsphsun2.harvard.edu

> On Jul 25, 2006, at 4:26 PM, smerryman@kc.rr.com wrote:
> 
> > Perhaps -tsfill- would help?
> 
> Scott,
> 
> I think -tsfill- must be right.  The problem I'm having is that 
> the  
> panel I'm creating has, as an indicator variable, four variables:  
> 
> state name, age cohort indicator, race and sex.  So, for instance, 
> 
> when I reshape the data, I use a nested reshape like this:
> 
> . reshape wide ir, i(fip age race sex) j(year)
> 
> But when I attempt to -tsset- the data, I can't seem to use the 
> same  
> kind of nesting.  When I simply use -tsset-, I use this:
> 
> . tsset fip year
> repeated time values within panel
> r(451);
> 
> Do you have any thoughts on this?
> 

If your panelvar is actually made up of four variables then you will 
need to create a single variable for the groups formed by fips, age, 
race, and sex.

For example:
egen id = groups(fip age race sex)
tsset id year
tsfill (or tsfill, full)


Scott


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