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From |
Erik Aadland <erikaadland@hotmail.com> |

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

Subject |
RE: st: Testing the extent of difference between two coefficients in the same model |

Date |
Wed, 1 Feb 2012 08:38:46 +0000 |

Thank you Maarten, David, Peter, Sami and Richard for your insight and suggestions. I have tested both techniques (one-sided z-test and modifying the model) but will do some more testing before deciding on which one to apply. I think I am leaning towards modifying the model. Kind regards, Erik. > Date: Tue, 31 Jan 2012 12:34:22 +0100 > Subject: Re: st: Testing the extent of difference between two coefficients in the same model > From: maartenlbuis@gmail.com > To: statalist@hsphsun2.harvard.edu > > On Mon, Jan 30, 2012 at 11:12 PM, David Hoaglin wrote: > > A model in > > which the two coefficients are equal is the same as the model in which > > the predictor associated with that coefficient is the sum of "old" and > > "new." > > This is a trick that is often forgotten (at least in my discipline), > but can have surprisingly useful applications beyond adding linear > constraints to models that do not allow the -constraint- option. I > submitted a Stata tip on this topic a couple of days ago. > <http://www.maartenbuis.nl/wp/sumconstr.html> > > -- Maarten > > -------------------------- > Maarten L. Buis > Institut fuer Soziologie > Universitaet Tuebingen > Wilhelmstrasse 36 > 72074 Tuebingen > Germany > > > http://www.maartenbuis.nl > -------------------------- > * > * 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/

**Follow-Ups**:**Re: st: Testing the extent of difference between two coefficients in the same model***From:*Maarten Buis <maartenlbuis@gmail.com>

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