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From |
John LeBlanc <leblancj@dal.ca> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: RE: FITINT: does it test all two-way interactions simultaneously? |

Date |
Wed, 20 May 2009 08:21:26 -0300 |

You're right; fairly easy to test. Here are the results:

If it is, here is my proposed approach:

2) Create new model with main effects plus the interactions from step 1)

4) Keep those interaction terms where lrtest p-value < 0.05.

John sjsamuels@gmail.com wrote:

John, this seems to be a question that you can answer by test which specifies a few interaction terms. Be sure to report back your findings. -Steve On Tue, May 19, 2009 at 12:20 PM, Nick Cox <n.j.cox@durham.ac.uk> wrote:-fitint- is a user-written program from SSC. Please remember to specify where user-written stuff you refer to comes from. In this case, I don't recognise either of the authors as contributors to the list. Either way, if you get no good answers to this question, you may need to look at the code -- which appears to be well structured and commented -- and/or to contact the program authors directly. Nick n.j.cox@durham.ac.uk John LeBlanc I have an -ologit- model with 8 predictor variables and fortunately a large dataset. I'm using -fitint- to see if there are any interesting two-way interactions among the 28 possibilities. Does -fitint- put all 28 in simultaneously or does it (I hope) test them one by one? by the way, what is the purpose of the -factors- option? At this point, I'm simply copying all dependent variables into both -factors()- & -twoway()-. I can't figure this out from the .hlp file. * * 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/

-- Regards, John LeBlanc _________________________________________________________

Associate Professor Pediatrics, Psychiatry, Community Health and Epidemiology Dalhousie University IWK Health Centre Work phone: (902) 470-8930 5850 University Avenue Work fax: (902) 470-6913 Halifax, Nova Scotia Email: John.LeBlanc@Dal.Ca B3K 6R8 CANADA Pager: (902) 470-8888 ________________________________________________________________ * * 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: FITINT: does it test all two-way interactions simultaneously?***From:*John LeBlanc <leblancj@Dal.Ca>

**st: RE: FITINT: does it test all two-way interactions simultaneously?***From:*"Nick Cox" <n.j.cox@durham.ac.uk>

**Re: st: RE: FITINT: does it test all two-way interactions simultaneously?***From:*sjsamuels@gmail.com

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