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Re: st: Re: Time invariant variables and panel data


From   "Rodrigo A. Alfaro" <ralfaro76@hotmail.com>
To   <statalist@hsphsun2.harvard.edu>
Subject   Re: st: Re: Time invariant variables and panel data
Date   Sat, 27 May 2006 15:22:23 -0400

For fixed-effect -xtreg, fe- for random effect -xtreg, re-. I think xtgee 
computes random-effects. Probably you would like to take a look of 
Hausman-Taylor estimator as well -help xthtaylor-. Rodrigo.

----- Original Message ----- 
From: "Christer Thrane" <ch-thran@online.no>
To: <statalist@hsphsun2.harvard.edu>
Sent: Saturday, May 27, 2006 2:19 PM
Subject: Re: st: Re: Time invariant variables and panel data


First q: yes
Second q: No, I don't think so. FE utilizes the changes within persons, so
if thing don't change, FE is not viable.

CT
----- Original Message ----- 
From: "Rho YH" <mania1@korea.ac.kr>
To: <statalist@hsphsun2.harvard.edu>
Sent: Saturday, May 27, 2006 7:44 PM
Subject: RE: st: Re: Time invariant variables and panel data


> To be sure, are the "random effects" and "fixed effects" of the answer
> the -RE and -FE options of xt-
> series commands?
> Also, as xtgee does not have such option, then can I use time invariant
> variables anyway?
>> ---- Original Message ----
>> From : Christer Thrane [ch-thran@online.no]
>> To : statalist@hsphsun2.harvard.edu
>> Date : 2006? 5? 28?(?) 01:38:38
>> Subject : st: Re: Time invariant variables and panel data
>>
>>
>>Hi,
>>
>>If you estimate random effects models, you can have both time-varying and
>>time-invariant variables on the right hand side.
>>
>>If you estimate fixed effects models, you must have time-varying on the
>>right hand side. But fixed effects also handles interactions between
>>time-varying and time-invariant right hand side variables. (Then the
>>interaction is no longer time-invariant.)
>>
>>Take a look at Woldridge's Basic Econometrics. A modern introduction--it's
>>on Stata website.
>>
>>HTH
>>
>>Christer
>>************************************************
>>Professor Christer Thrane
>>Department of Social Science
>>Lillehammer University College
>>2626 Lillehammer, Norway
>>+ 47 61 28 81 70 (fax)
>>+ 47 61 28 82 47 (phone, work)
>>+ 47 61 25 53 04 (phone, home)
>>E-mail, work: christer.thrane@hil.no
>>E-mail, home: ch-thran@online.no
>>************************************************
>>
>>
>>
>>----- Original Message -----
>>From: "Rho YH"
>>To:
>>Sent: Saturday, May 27, 2006 4:48 PM
>>Subject: st: Time invariant variables and panel data
>>
>>
>>>I have incidentally found that panel data models (as far as I found the
>>>Statalist, xtreg with -FE option)
>>> cannot have time invariant variables and will be automatically omitted
>>> when included.
>>> In a general sense, then all xt- models (including xtgee) cannot have
>>> time
>>> invariant variables?
>>> Or in what instance does this fact come in effect?
>>> Second, then does this mean that I cannot use time invariant variables
>>> (like sex (M/F)) even
>>> when these variables may be important?
>>> I have two books about panel data (Twisk, and Sophia Rabe-Hesketh) but
>>> did
>>> not find this fact.
>>> Is it written in these books? 
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