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st: Re: st: Re: st: Syntax of –cmp- for an ordered probit selection model


From   <[email protected]>
To   [email protected]
Subject   st: Re: st: Re: st: Syntax of –cmp- for an ordered probit selection model
Date   Mon, 11 Nov 2013 19:53:50 +0900 (JST)

Dear Tamas,

Thank you so much for the suggestion.
But the same error message still pops out when I put double quotes on the expression.
(while in the case where the selection variable is a binomial one, the command works well even without double quotes!)

Do you think there may be any other problem of the syntax?

Kuo, Chiu-Wei

--- On Mon, 2013/11/11, "Bartus Tamás" <[email protected]> wrote:

> Dear Kuo, 
>  
> Instead of  
>  
> ind(selection_var*$cmp_probit $cmp_oprobit) 
>  
> try 
>  
> ind("selection_var*$cmp_probit" $cmp_oprobit) 
>  
> Expressions appearing in the indicators option must be enlosed in double quotes
>  
> Tamas
>  
> On 13/11/11, [email protected] wrote: 
> 
> > 
> > Dear all, 
> > 
> > I am trying to estimate the following selection model. 
> > outcome equation: outcome_var =b1* var_list1 + u 
> > selection equation: selection_var = b2*var_list2 + v 
> > where outcome_var is a binomial variable, and selection_var is an ordered categorical variable. 
> > 
> > I use the command –cmp- (which can be obtained by –ssc cmp-) to estimate the model. My command is 
> > cmp (outcome_var = var_list1) (selection_var = var_list2), ind(selection_var*$cmp_probit $cmp_oprobit) 
> > However, the error message “Indicator for outcome_var must only evaluate to integers between 0 and 8. r(198);” keeps popping out. 
> > 
> > I found out that the same error massage appears whenever the selection variable is an ordered categorical variable, while it disappears and the command works normally when the selection variable is a binomial one. 
> > 
> > In the paper (“Estimating fully observed recursive mixed-process models with cmp”) written by the –cmp- writer, David Roodman, he mentioned that –cmp- is capable of doing the same estimation as –ssm- and –oheckman- do, so I think that –cmp- is the appropriate command for my model. 
> > 
> > I suppose that there is some problem with the part of the syntax, 
> > ind(selection_var*$cmp_probit $cmp_oprobit) 
> > I spent much time to figure out what the correct syntax is but still failed. 
> > I really appreciate it if anyone can point out the problem of my syntax. 
> > Thank you so much. 
> > 
> > Kuo, Chiu-Wei 
> > 
> > *
> > * For searches and help try:
> > * http://www.stata.com/help.cgi?search
> > * http://www.stata.com/support/faqs/resources/statalist-faq/
> > * http://www.ats.ucla.edu/stat/stata/
> > 
> > 
> 
> --
> 
> Tamás Bartus, PhD
> Associate Professor, Deputy Director
> Institute of Sociology and Social Policy
> Program Director, Doctoral School of Sociology
> Corvinus University, Budapest 
> 1093 Budapest, Közraktár utca 4-6.
> Room 424.
> Phone: +36-1-482-7301 
> Fax: +36-1-482-7348
> Homepage: http://web.uni-corvinus.hu/bartus
> 
> *
> *   For searches and help try:
> *   http://www.stata.com/help.cgi?search
> *   http://www.stata.com/support/faqs/resources/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/faqs/resources/statalist-faq/
*   http://www.ats.ucla.edu/stat/stata/


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