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RE: st: Ordered Probit with Panel Data [reoprob]


From   "Maarten Buis" <M.Buis@fsw.vu.nl>
To   <statalist@hsphsun2.harvard.edu>
Subject   RE: st: Ordered Probit with Panel Data [reoprob]
Date   Tue, 11 Apr 2006 18:49:04 +0200

One thing you want to do is rescale your explanatory variables, (e.g. divide totalpsl by 1,000,000) so you get more meaningful parameters. This sometimes also helps with errors like the ones you have. If it doesn't help use Richard's suggestion to start with -version 8.2-.

-----------------------------------------
Maarten L. Buis
Department of Social Research Methodology 
Vrije Universiteit Amsterdam 
Boelelaan 1081 
1081 HV Amsterdam 
The Netherlands

visiting adress:
Buitenveldertselaan 3 (Metropolitan), room Z214 

+31 20 5986715

http://home.fsw.vu.nl/m.buis/
-----------------------------------------

-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu]On Behalf Of ALICE DOBSON
Sent: dinsdag 11 april 2006 18:43
To: statalist@hsphsun2.harvard.edu
Subject: Re: st: Ordered Probit with Panel Data [reoprob]

Thanks a lot Richards.

Here is the oprob command line.

reoprob denentry totalpsl inctotpsl ldvolperpsl incldvolperpsl pslperixc
incpslperixc c1, i(sac)
where sac is the panel ID variable



Please find below the oprobit estimates with the same variables.


oprobit denentry  totalpsl inctotpsl ldvolperpsl incldvolperpsl pslperixc
incpslperixc c1

Iteration 0:   log likelihood = -819.32506
Iteration 1:   log likelihood = -804.45505
Iteration 2:   log likelihood = -802.44132
Iteration 3:   log likelihood = -801.99999
Iteration 4:   log likelihood = -801.98951
Iteration 5:   log likelihood =  -801.9895

Ordered probit regression                         Number of obs   =      
2185
                                                  LR chi2(7)      =     
34.67
                                                  Prob > chi2     =    
0.0000
Log likelihood =  -801.9895                       Pseudo R2       =    
0.0212

------------------------------------------------------------------------------
    denentry |      Coef.   Std. Err.      z    P>|z|     [95% Conf.
Interval]
-------------+----------------------------------------------------------------
    totalpsl |  -8.61e-07   2.48e-07    -3.47   0.001    -1.35e-06  
-3.75e-07
   inctotpsl |   .0000117   4.92e-06     2.39   0.017     2.10e-06   
.0000214
ldvolperpsl |  -.0663414   .0484572    -1.37   0.171    -.1613158    
.028633
incldvolpe~l |  -.0190692   .1165205    -0.16   0.870    -.2474451   
.2093067
   pslperixc |   .0000134   3.16e-06     4.23   0.000     7.19e-06   
.0000196
incpslperixc |   3.54e-06   4.28e-06     0.83   0.408    -4.85e-06   
.0000119
          c1 |  -.0090175   .0030619    -2.95   0.003    -.0150187  
-.0030163
-------------+----------------------------------------------------------------
       /cut1 |   .5188891   .3154155                     -.0993139   
1.137092
       /cut2 |   1.050361   .3172624                      .4285386   
1.672184
       /cut3 |   1.257379   .3195799                      .6310139   
1.883744
       /cut4 |   1.400535    .321929                      .7695659   
2.031504
       /cut5 |   1.568453    .325447                      .9305884   
2.206317
       /cut6 |   1.735414   .3309201                      1.086822   
2.384005
       /cut7 |   1.811064   .3343915                      1.155669    
2.46646
       /cut8 |   2.132501   .3601558                      1.426609   
2.838393
       /cut9 |   2.261056   .3785036                      1.519202   
3.002909


>From: Richard Williams <Richard.A.Williams.5@ND.edu>
>Reply-To: statalist@hsphsun2.harvard.edu
>To: statalist@hsphsun2.harvard.edu
>Subject: Re: st: Ordered Probit with Panel Data [reoprob]
>Date: Tue, 11 Apr 2006 11:00:18 -0500
>
>At 09:50 AM 4/11/2006, ALICE DOBSON wrote:
>>HI all,
>>I use Stata 9.1. I apologise for repeating this question in case someone
>>already addressed the same and I missed it. I had earlier posted this
>>question on Mar 29, 06.
>>
>>I ran an oprobit with a panel data and got the estimates. Of course, the
>>regression model does not consider the panel nature of the data. But, when
>>I am running an reoprob with exactly the same variables I get the
>>following message.
>>
>>conformability error
>>r(503);
>
>Alice, perhaps you could show us the exact command you gave?  My wild guess
>is that either (a) you've got a syntax error, or (b) there is some sort of
>multicollinearity problem.  But, it is hard to say without more details.
>
>
>-------------------------------------------
>Richard Williams, Notre Dame Dept of Sociology
>OFFICE: (574)631-6668, (574)631-6463
>FAX:    (574)288-4373
>HOME:   (574)289-5227
>EMAIL:  Richard.A.Williams.5@ND.Edu
>WWW (personal):    http://www.nd.edu/~rwilliam
>WWW (department):    http://www.nd.edu/~soc
>
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