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st: RE: Instrumental variables regression for grouped panel data


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: Instrumental variables regression for grouped panel data
Date   Mon, 14 Jun 2004 10:06:53 +0100

It is not clear why you want to use a string 
variable here. String variables are designed
to hold arbitrary text and are considered
as equivalent to numeric missings in this 
context. 

If your string variable is in effect coding a categorical 
variable, check out -encode-. If it is in effect
a string variable by mistake, check out -tostring-. 

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

Shuchita Agarwal
 
> 3) STATA doesn't allow me to use string variables in the 
> random effects 
> regression, and gives an error of r(2000): no observations. 
> What is the 
> cause of this problem?

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