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

[<chiuweikuo@yahoo.co.jp>]

Dear Buchanan,

Thank you so much for your suggestion. 
I check the data again, and all the data of the outcome variable is valued 0 or 1. 
Do you think there may be any other possible problem?

Kuo, Chiu-Wei

--- On Mon, 2013/11/11, William Buchanan <william@williambuchanan.net> wrote:

> What are the values of your outcome variable?  Are any of the values outside of the 0-8 range indicated by the error message?
> 
> Sent from my iPhone
> 
> > On Nov 11, 2013, at 4:53, <chiuweikuo@yahoo.co.jp> wrote:
> > 
> > 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" <tamas.bartus@uni-corvinus.hu> wrote:
> >> 
> >> Dear Kuo, 
> >> 
> >> Instead of  
> >> 
> >> ind(selection_var*$cmp_probit $cmp_oprobit) 
> >> 
> >> try 
> >> 
> >> ind("selection_var*$cmp_probit" $cmp_oprobit) 
> >> 
> >> Expressions appearing in the indicators option must be enlosed in double quotes
> >> 
> >> Tamas
> >> 
> >>> On 13/11/11, chiuweikuo@yahoo.co.jp wrote: 
> >>> 
> >>> 
> >>> Dear all, 
> >>> 
> >>> I am trying to estimate the following selection model. 
> >>> outcome equation: outcome_var =b1* var_list1 + u 
> >>> selection equation: selection_var = b2*var_list2 + v 
> >>> where outcome_var is a binomial variable, and selection_var is an ordered categorical variable. 
> >>> 
> >>> I use the command –cmp- (which can be obtained by –ssc cmp-) to estimate the model. My command is 
> >>> cmp (outcome_var = var_list1) (selection_var = var_list2), ind(selection_var*$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
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> >>> * 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
> >> 
> >> *
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> > 
> > *
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*
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