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st: RE: AW: nlcom

From   "Nick Cox" <>
To   <>
Subject   st: RE: AW: nlcom
Date   Mon, 14 Jun 2010 10:56:05 +0100

Without attempting to answer this directly I did notice that in your last command the reference to 


was probably a typo for 



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),

nlcom _b[a1] * _b[prop_gasto] * _b[a2]

nlcom (-1) * ((1/(1+ exp(`xb0'))) ^2) * _b[prop_gasto] * (`var60M' -

 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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