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RE: st: RE: non-constant Frequency weights

From   Nick Cox <>
To   "''" <>
Subject   RE: st: RE: non-constant Frequency weights
Date   Tue, 26 Oct 2010 19:28:05 +0100

Fair enough. Now you have a specific question, to which I don't know the answer; but someone else may have specific advice. 


Stephen O Neill

When I try to run - xtreg,fe - I get the error message "weight must be constant 
within ID", where ID is my unique identifier for each individual and is constant 
for an individual over time. I also wanteed to use the user written - xtabond2 - 
or some other dynamic model but it appears that weights can't be used with 

Nick Cox <>

I don't see the connections between these statements. A variable containing 
frequency weights can vary between observations, in this instance within panels 
as well as between panels, so that is not a problem in itself. 

Perhaps some particular procedures have more restricted assumptions, but you 
don't say what they are. 

Stephen O Neill

I am using unbalanced panel data which contains a frequency weight each year. 
However the weight is not constant through time with the result that I cannot 
weight the data using - [fweight = weight] - . I was just wondering if there is 
a simple work around?

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