Bookmark and Share

Notice: On March 31, it was announced that Statalist is moving from an email list to a forum. The old list will shut down on April 23, and its replacement, is already up and running.

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: st: RE: non-constant Frequency weights

From   Steven Samuels <>
Subject   Re: st: RE: non-constant Frequency weights
Date   Tue, 26 Oct 2010 14:40:47 -0400

Stephen O Neill:

Off-topic, but I'm curious: How can you have repeated identical observations on one individual at a single time point, which is what a frequency weight>1 would imply?


On Oct 26, 2010, at 2:28 PM, Nick Cox wrote:

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?

*   For searches and help try:

© Copyright 1996–2015 StataCorp LP   |   Terms of use   |   Privacy   |   Contact us   |   Site index