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From |
Nick Cox <n.j.cox@durham.ac.uk> |

To |
"'statalist@hsphsun2.harvard.edu'" <statalist@hsphsun2.harvard.edu> |

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 n.j.cox@durham.ac.uk 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 <njcoxstata@gmail.com> > 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 <Steingros@gmx.de> > 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?] * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**Follow-Ups**:**Re: RE: st: Fwd: exponential regression in stata***From:*"Bastian Steingros" <Steingros@gmx.de>

**References**:**st: Fwd: exponential regression in stata***From:*"Bastian Steingros" <Steingros@gmx.de>

**Re: st: Fwd: exponential regression in stata***From:*Nick Cox <njcoxstata@gmail.com>

**Re: st: Fwd: exponential regression in stata***From:*"Bastian Steingros" <Steingros@gmx.de>

**RE: st: Fwd: exponential regression in stata***From:*Nick Cox <n.j.cox@durham.ac.uk>

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