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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.

Nick
[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.
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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