Adding to Glenn's comments about the problems with the code, it
appears that you need n to be defined externally -- as a variable or
as a scalar. Somewhere you have b without the localization embedders
(b instead of `b').
You might want to check out -mata optimize- instead of -ml-. The
former is a pretty universal optimizer, while the latter is really
intended to solve statistical problems with the data. If you want to
find the maximum/minimum of a function, it might be working out better
and result in a cleaner code with -mata optimize-.
On 10/29/08, Katia Bobulova <[email protected]> wrote:
> Dear Nick,
>
> I'll try to be more clear.
>
> following my program:
>
> program define myprogram
> version 10.0
> args lnf a b c e
>
> tempvar sigma mc ma msigma mb
>
> quietly gen double `sigma'=0.5*`e'
> quietly gen double `mc'=1-`c'
> quietly gen double `ma'=1-`a'
> quietly gen double `msigma'=1-`e'
> quietly gen double `mb'=1-`b'
>
> quietly replace
> `lnf'=ln((`a')*(`b')*((((`mc')*(`sigma')+(`m'))^alfa)*(((`mc')*(`sigma'))^s)*(((`mc)*(`msigma'))^n))+
> (`a')*(`mb)*((((`mc') *(`sigma'))^b)*(((`mc') *(`sigma')
>
> end
>
> Everything is fine, but when I type:
>
> ml model lf myprogram (a:) (b:) (c:) (e:)
>
> Stata tells me that is invalid syntax.
>
> What's wrong?
>
> Thanks
>
> Katia
>
> 2008/10/29 Nick Cox <[email protected]>:
>
> > It looks as if there is a bug within the part of the program you have not shown us.
> >
> > I suspect that you did not type
> >
> > version10.1
> >
> > as that would have generated a different error message.
> >
> > version 10.1
> >
> > is the correct syntax.
> >
> > In other words, you need to show more of your program to get better advice.
> >
> > Nick
> > [email protected]
> >
> > Katia Bobulova
> >
> > I am using the likelihood function lf. I have a problem in the end. I
> > have written the program and I don't have any problem.
> >
> > I typed:
> > program define myprogram
> > version10.1
> > args lnf a b c d
> > .
> > .
> > .
> > end
> >
> > After this I tiped:
> >
> > ml model lf myprogram (a:) (b:) (c:) (d:)
> >
> > but Stata tells me that is an invalid syntax. Any suggestion?
> >
> >
> > *
> > * 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/
> >
> *
> * 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/
>
--
Stas Kolenikov, also found at http://stas.kolenikov.name
Small print: I use this email account for mailing lists only.
*
* 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/
