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AW: RE: st: regression using dummy variables


From   "Martin Weiss" <martin.weiss1@gmx.de>
To   <statalist@hsphsun2.harvard.edu>
Subject   AW: RE: st: regression using dummy variables
Date   Mon, 7 Sep 2009 15:14:53 +0200

<> 



Explanation: These results are thrown up by -nlcom- which -sheafcoef-
apparently calls internally. An oddity about the command is that is requires
users to provide the "_b[]" notation which other commands in the same area,
like -lincom-, do not require. The handbook [R] clearly says as much on page
1202, but if another command calls -nlcom-, this issue may not be as
apparent to end users...



HTH
Martin


-----Ursprüngliche Nachricht-----
Von: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] Im Auftrag von Martin Weiss
Gesendet: Montag, 7. September 2009 15:05
An: statalist@hsphsun2.harvard.edu
Betreff: AW: RE: st: regression using dummy variables


<> 

You have to say

*************
test _b[p1] = _b[p2]
*************


to make this work...


HTH
Martin


-----Ursprüngliche Nachricht-----
Von: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] Im Auftrag von gjhxmu@sina.com
Gesendet: Montag, 7. September 2009 15:02
An: statalist
Betreff: Re: RE: st: regression using dummy variables

Dear Maarten,
I knew -sheafcoef- from your posting, thank you!
I followed what you typed. However, an error message "p1 not found r(111)"
was caused.
For example,
    sysuse nlsw88, clear
    recode occupation (11/12=4) ///
                      (9/10=13)
    gen ln_w = ln(wage)

    xi: reg ln_w i.occupation married never_married 

    sheafcoef, latent( _I* ; married never_married) post
    test p1=p2

What is wrong with my typing?

Thank you for any help.

Best regards,
Rose. 


----- Original Message -----
From: Maarten buis <maartenbuis@yahoo.co.uk>
To: stata list <statalist@hsphsun2.harvard.edu>
Subject: RE: st: regression using dummy variables
Date: 2009-9-4 00:25:07

--- Amy Jennings wrote:
> I have run the sheafcoef command - can I just check that the
> values I need are p1, p2 etc and these can be interpreted in
> the same way as a standardised beta coefficient? 

Yes. You can also specify the -post- option and actually test
whether these two coefficients are the same using the -test-
command. So something like:

sheafcoef, ///
latent( _Ihighested_2 _Ihighested_3 _Ihighested_4 ; ///
_IMothers_B_2 _IMothers_B_3 ) ///
post

test p1 = p2

Hope this helps,
Maarten

--------------------------
Maarten L. Buis
Institut fuer Soziologie
Universitaet Tuebingen
Wilhelmstrasse 36
72074 Tuebingen
Germany

http://www.maartenbuis.nl
--------------------------




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