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RE: st: Fwd: exponential regression in stata

From   Nick Cox <[email protected]>
To   "'[email protected]'" <[email protected]>
Subject   RE: st: Fwd: exponential regression in stata
Date   Wed, 19 Jan 2011 15:59:29 +0000

By the way, I naturally agree with Al Feiveson's point that these methods carry different assumptions about error structure. They are not identical alternatives. I take it as read that choosing any technique implies a commitment to consider its assumptions. 

[email protected] 

Nick Cox 

"ln y vs x" and "ln on both sides" are exactly the same proposal as ln(exp(x)) is nothing but x. 

I meant most assumptions about functional form. 

Bastian Steingros (a.k.a. Markus) 

Dear Nick,
thanks for the comment.
what kind of details would be helpful in your eyes? About the var's? Their distribution?
to the classical method: you recommend ln(y) on x. Justina recommend ln on both sides. To obtain the e function, I should use your approach right?

> Von: Nick Cox <[email protected]>

> There are several ways to do this and differing opinions on their
> relative merits. The classical method is a regression of ln y on x.
> But I'd try -glm, link(log)- instead. There might be reasons to use
> -nl- instead, but -nl- can be awkward.
> There are lots of ways to extend the model you mention to three
> predictors, but without any details helpful comment is difficult.
> On Wed, Jan 19, 2011 at 9:38 AM, Bastian Steingros <[email protected]>
> wrote:
> > I want to run a exp. regression in stata. But I have not found any
> instructions in the help options. do you have any ideas what to enter in stata
> to obtain such a regression model?
> >
> > I mean by exp. function something like : y=0,343 * e^(22,33*x)
> >
> > [my data set has 1 dep. var. and 3 indep. var.'s --> is such a model
> also possible for 3 x-var's?]

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