Bookmark and Share

Notice: On March 31, it was announced that Statalist is moving from an email list to a forum. The old list will shut down at the end of May, and its replacement, statalist.org is already up and running.


[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: st: RE: AW: nlcom


From   Olivia Bacha <oliviabacha@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: RE: AW: nlcom
Date   Tue, 15 Jun 2010 01:18:18 -0300

Dear Nick,

Thanks for your observation.

Olivia

2010/6/14 Nick Cox <n.j.cox@durham.ac.uk>:
> Without attempting to answer this directly I did notice that in your last command the reference to
>
> exp(xb1)
>
> was probably a typo for
>
> exp(`xb1')
>
> Nick
> n.j.cox@durham.ac.uk
>
> Martin Weiss
>
> Marginal effects are best estimated using -margins-. What is your reason for
> not using it?
>
> What is the error description (the code number is not that informative)?
>
> If you want -quietly- and the -r(mean)- returned value, you can also use the
> -meanonly- option of -summ-.
>
> Olivia Bacha
>
> I am running the following code after logit estimation using nlcom,
> this is to estimate marginal effects.
>
>
> quietly sum gastos
> local gastosM= r(mean)
>
> quietly sum var60
> local var60M= r(mean)
>
> quietly sum gastopc
> local gastopcM= r(mean)
>
> quietly sum gastopcreeleição
> local gastopcreeleiçãoM=r(mean)
>
> quietly sum Idade
> local IdadeM=r(mean)
>
> quietly sum qualidade
> local qualidadeM=r(mean)
>
> quietly sum qtpart
> local qtpartM=r(mean)
>
> quietly sum educ
> local educM=r(mean)
>
> local xb1 _b[prop_gasto]*(`gastosM'/`var60M') + _b[gastopc]*`gastopcM'
> + _b[reeleição] + _b[gastopcreeleição]*`gastopcreeleiçãoM' +
> _b[Idade]*`IdadeM' + _b[qualidade]*`qualidadeM' + _b[qtpart]*`qtpartM'
> + _b[educ]*`educM'
>
>
> local xb0 _b[prop_gasto]*(`gastosM'/`var60M') + _b[gastopc]*`gastopcM'
> + _b[Idade]*`IdadeM' + _b[qualidade]*`qualidadeM' +
> _b[qtpart]*`qtpartM' + _b[educ]*`educM'
>
>
>
> nlcom (a1:(1/(1+ exp(`xb1')))^2) (a2:(`var60M' - `gastosM')/`var60M'^2),
> post
>
> nlcom _b[a1] * _b[prop_gasto] * _b[a2]
>
>
> nlcom (-1) * ((1/(1+ exp(`xb0'))) ^2) * _b[prop_gasto] * (`var60M' -
> `gastosM')/`var60M'^2
>
>
>  nlcom ((1/(1+ exp(xb1))) ^2) * _b[prop_gasto] * (1/`var60M')^2 * `gastosM'
>
>
> Stata is returning error 198 when i start using nlcom. What's my mistake?
>
>
> *
> *   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/


© Copyright 1996–2014 StataCorp LP   |   Terms of use   |   Privacy   |   Contact us   |   Site index