RE: st: help log linear

["Vincenzo Verardi" <vincenzo_verardi@hotmail.com>]

Hello, I'm not shure if I understood properly the question but I would do:

1) run the regression lny=xb

the I would type the command

predict lnyhat, xb

2) I would then exponentiate my result generating a new variable

gen ypred=exp(lnyhat)

I would then have the predicted y.

3) For the regression without the constant, I would type:

reg lny x, noconst

I hope this helps

regards

Vincenzo

P.S. if it is a log-lin regression with an explanotary dummy variable, take 
care on how to read the coefficient associated to the dummy (exp(beta)-1).


> From: cas2111@columbia.edu
> Reply-To: statalist@hsphsun2.harvard.edu
> To: statalist@hsphsun2.harvard.edu
> Subject: st: help log linear
> Date: Sat, 21 Feb 2004 22:35:35 -0500
>
>
> Hi,
>
> I am having a bit of difficulties figuring out how to predict a y
> in a log linear model.  I cannot determine the following items:
>
> 1)obtaining fitted values of logy(i) from the regression of logy
> on each independent x
> 2)for each observation i, creating a variable equal to exp(logy(i))
> 3)performing a regression through the origin
>
> Any other information that could be provide to assist in running a
> log linear regression would be greatly appreciated.
>
> I could not find anything in my manual about it.
>
> Thank you,
> cheryl
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