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Re: st: Questions about selmlog and svyselmlog


From   "Joao Ricardo F. Lima" <jricardofl@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Questions about selmlog and svyselmlog
Date   Wed, 20 Oct 2010 13:08:59 -0200

Dear Yu,

the sintax of selmlog is:

selmlog depvar varlist, select(depvar_m=varlist_m) [lee dmf(#) dhl(# [all]) etc

depvar_m is your categorical variable, with more than 2 categories, oks?

and

depvar must have non-missing values for only one of theses categories.

HTH,

JL



2010/10/20 Yu(Sophia) Zhang <sophia.zhangyu@gmail.com>:
> Dear Joao,
>
>  Thanks so much for your reply. The second question has been solved
> following your suggestion.
>
>   For the first one, do you mean that across all categories ( which
> are schools in my selection equation), only one category can have
> non-missing values of dep var, and the other categories must have some
> missing values of depvar? I deleted some values of depvar to meet this
> requirement, but I still got the same error. Would you mind explaining
> it in more detail?
>
>  Thank you so much!
>
>  Yu
>
> On Tue, Oct 19, 2010 at 7:03 PM, Joao Ricardo F. Lima
> <jricardofl@gmail.com> wrote:
>> Yu,
>>
>> About the first question:
>>
>> The vardep  of the income equation must have non missing values ONLY
>> for one category.
>>
>> About the second:
>>
>> the svyselmlog was written to Stata 8. Then, try this:
>>
>> version 8: svyset [pweight = varw], psu(varpsu) strata(varstrat)
>> svyselmlog vardep varindep , sel() meth() boot()....
>>
>> Hope this Helps,
>>
>> Joao Lima
>>
>>
>> 2010/10/19 Yu(Sophia) Zhang <sophia.zhangyu@gmail.com>:
>>> Dear statisticians,
>>>
>>>     I am now working on my dissertation and am stuck by a STATA command.
>>> Basically, I want to run Heckman correction based on the multinomial logit
>>> model. I am going to use the command selmlog. However, a strange error shows
>>> up like this:
>>>
>>> Non-missing values of dependent variable for more than one outcome
>>> variable _m* not found
>>>
>>>    I guess it might be associated with this statement in the help file:
>>>
>>> 1) In the output, selmlog adds to varlist a series of variables labelled
>>> _m[depvar_m value], except for the dhl option
>>>
>>> 2) The outcome variable depvar is observed for only one value of depvar_m.
>>> It is important that depvar should have missing values for any other value
>>> of depvar_m.
>>>
>>>    But still cannot figure out what's wrong.
>>>
>>>    In addition, when I want to control for sampling weights by running the
>>> command svyselmlog, I get another error:
>>>
>>> data not set up for the old survey estimation commands; use svyset under
>>> version control or use the new svy prefix.
>>>
>>>   But there is no "svy: selmlog" command in STATA 11.....
>>>
>>>     I wonder if someone could kindly give me some hint for these two
>>> problems. I have asked several people but no one were familiar with this
>>> problem.
>>>
>>>     I appreciate your help very much.
>>>
>>>     Sincerely,
>>>
>>>     Yu
>>>
>>> *
>>> *   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/
>>>
>>
>>
>>
>> --
>> ---------------------------------------------------------
>> João Ricardo F. de Lima
>> Pesquisador A - Economia Aplicada
>> Embrapa Semiárido
>> e-mail: joao.ricardo@cpatsa.embrapa.br
>> fone: +55 (87) 3862-1711 Ramal: 167
>> home-page: www.cpatsa.embrapa.br
>> ----------------------------------------------------------
>>
>> *
>> *   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/
>>
>
>
>
> --
> Yu Zhang
> PhD Candidate
> Economics and Education
> Teachers College, Columbia University
>
> *
> *   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/
>



-- 
---------------------------------------------------------
João Ricardo F. de Lima
Pesquisador A - Economia Aplicada
Embrapa Semiárido
e-mail: joao.ricardo@cpatsa.embrapa.br
fone: +55 (87) 3862-1711 Ramal: 167
home-page: www.cpatsa.embrapa.br
----------------------------------------------------------

*
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