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From |
Chris Witte <eljefespeaks@yahoo.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: Re: using coefficients from model |

Date |
Tue, 31 Mar 2009 09:44:46 -0700 (PDT) |

Maarten, Hmm, I think I understand where you are coming from, but by adjusting the constant in the equation, I consistently get the same values as _predict_... put another way, if I use the coefficients and constant given in the _fracpoly_ output, I get values that are always off of the _predict_ values by the same amount - and this can be fixed by adjusting the constant by the amount that I am off. This seems like a half-arsed way of doing things, I know, but it does seem to work. --- Chris Witte wrote: > I want to report the regression equation in my manuscript > so the reader can plug in their independent variable values > and get the correct estimate. I thought that calculating > the difference between the _fracpred_ estimated values and > the values estimated using the coefficients from the > _fracpoly_ output would be the fastest way to find the > "real" constant for reporting purposes. Is there a better > (i.e. easier) way? Am I misunderstanding the process? Point is that -fracpoly- does not adjust the constant but the covariates. I would actually report the formulas in a footnote or an appendix (together with the necessary describtive statistics of the covariates, that are used in the formulas). This way your result will become less of a "black box". -- Maarten ----------------------------------------- Maarten L. Buis Institut fuer Soziologie Universitaet Tuebingen Wilhelmstrasse 36 72074 Tuebingen Germany * * 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/

**References**:**Re: st: Re: using coefficients from model***From:*Maarten buis <maartenbuis@yahoo.co.uk>

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