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From |
Maarten Buis <maartenlbuis@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

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

Date |
Tue, 31 Jan 2012 12:34:22 +0100 |

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/

**References**:**st: Testing the extent of difference between two coefficients in the same model***From:*Erik Aadland <erikaadland@hotmail.com>

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

**RE: st: Testing the extent of difference between two coefficients in the same model***From:*Erik Aadland <erikaadland@hotmail.com>

**Re: st: Testing the extent of difference between two coefficients in the same model***From:*Sami Alameen <samialameen@gmail.com>

**Re: st: Testing the extent of difference between two coefficients in the same model***From:*David Hoaglin <dchoaglin@gmail.com>

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