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From |
Richard Williams <richardwilliams.ndu@gmail.com> |

To |
statalist@hsphsun2.harvard.edu, statalist@hsphsun2.harvard.edu |

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

Date |
Tue, 31 Jan 2012 11:19:22 -0500 |

At 06:34 AM 1/31/2012, Maarten Buis wrote:

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

------------------------------------------- Richard Williams, Notre Dame Dept of Sociology OFFICE: (574)631-6668, (574)631-6463 HOME: (574)289-5227 EMAIL: Richard.A.Williams.5@ND.Edu WWW: http://www.nd.edu/~rwilliam * * 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>

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

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