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| From | "Feiveson, Alan H. (JSC-SK311)" <alan.h.feiveson@nasa.gov> |
| To | "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu> |
| Subject | st: RE: exponential regression in stata |
| Date | Wed, 19 Jan 2011 08:20:57 -0600 |
Bastian - As others have suggested, you can fit the model in a number of ways. However if you wish to make correct inference on the results (e.g. tests of hypotheses) you need to know something about how the errors are distributed. If the exponential function is the mean response given the predictors and the errors can be assumed to be normally distributed around the function with constant variance, then using -nl- would give the correct inference. Often however, with exponential models, the errors don't have constant variance - then -glm- or a transformation might be more correct, or perhaps -nl- with unequal weighting. Al Feiveson -----Original Message----- From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Bastian Steingros Sent: Wednesday, January 19, 2011 3:01 AM To: statalist@hsphsun2.harvard.edu Subject: st: exponential regression in stata Dear all, 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? [my data set has 1 dep. var. and 3 indep. var.'s] Thanks very much for your help in advance. -- GMX DSL Doppel-Flat ab 19,99 Euro/mtl.! Jetzt mit gratis Handy-Flat! http://portal.gmx.net/de/go/dsl * * 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/ * * 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/