st: Re: programming non-linear squares in Stata

["Rodrigo A. Alfaro" <raalfaroa@gmail.com>]

-nl log3- seems similar... type
help nl

----- Original Message ----- 
From: "Maritza" <maritzasotomayor@yahoo.com>
To: <statalist@hsphsun2.harvard.edu>
Sent: Thursday, March 15, 2007 4:30 PM
Subject: st: programming non-linear squares in Stata



> Dear Statalist members,
> Somebody knows how to program a logistic distribution in Intercooled
> Stata 8.2 for Non-Linear Squares?. Stata offers two logistic
> functions but I need to apply this one: Y = 1/(1+exp(-b*X))
> I've tried to use the -User-supplied function- in the Non-Linear
> Statistics and every time I got an error message "varlist required"
> which could be because I have more than one explanatory  variable (I
> tried with just one, same error message)or because I need an specific
> indication that my data is longitudinal.
> This is what I typed:
>
> nl Y = 1/(1+exp(-b*X)) iitt avgtarif pdit tot lavrgdp lrdgpdif
> ldistancia     (the first one is the dependent variable)
>
> I am not familiar with programming in Stata, I hope there is an
> alternative. I check in the Stata archives with no luck for logistic
> distribution programming.
> I'd appreciate any help
> Maritza
>
>
>
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