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From |
Stephen O Neill <[email protected]> |

To |
[email protected] |

Subject |
Re: st: RE: non-constant Frequency weights |

Date |
Tue, 26 Oct 2010 13:34:12 -0700 (PDT) |

Hi Steve, My data is from a survey which contains weights representing the number of inidividuals in the population represented by each sample observation. However in differnt years this frequency weight is different i.e. the number of population individuals the sample observation represents changes from year to year. Hope this clarifies, Stephen ----- Original Message ---- From: Steven Samuels <[email protected]> To: [email protected] Sent: Tue, October 26, 2010 7:40:47 PM Subject: Re: st: RE: non-constant Frequency weights 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? Steve [email protected] 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. Nick [email protected] 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 these. Nick Cox <[email protected]> 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: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/ * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**Follow-Ups**:**Re: st:non-constant Frequency weights***From:*Steven Samuels <[email protected]>

**Re: st: RE: non-constant Frequency weights***From:*Steven Samuels <[email protected]>

**References**:**st: non-constant Frequency weights***From:*Stephen O Neill <[email protected]>

**st: RE: non-constant Frequency weights***From:*Nick Cox <[email protected]>

**Re: st: RE: non-constant Frequency weights***From:*Stephen O Neill <[email protected]>

**RE: st: RE: non-constant Frequency weights***From:*Nick Cox <[email protected]>

**Re: st: RE: non-constant Frequency weights***From:*Steven Samuels <[email protected]>

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