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Re: st: RE: AW: nlcom


From   Olivia Bacha <[email protected]>
To   [email protected]
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 <[email protected]>:
> 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
> [email protected]
>
> 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?
>
>
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