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From |
Maarten buis <[email protected]> |

To |
[email protected] |

Subject |
Re: st: RE: RE: CIs for the ratio of two adjusted predictions after logistic? |

Date |
Wed, 1 Aug 2007 17:31:19 +0100 (BST) |

--- Nick Cox <[email protected]> wrote: > I think in this the term > > _b[foreign] > > should be > > _b[foreign] * foreign > > and that > > _b[foreignXmpg] * mpg > > should be > > _b[foreignXmpg] * foreignXmpg No, I am comparing for each value of mpg the predicted probability of foreign cars with the predicted probabilities of domestic cars. To do so I create a local `xb_for' which contains the linear predictor assuming the car is foreign and a local `xb_dom' which contains the linear predictor assuming that the car is domestic. (actually the locals contain the commands that will create the linear predictors, but that is a detail) Consider the code for the linear predictor assuming that the cars are foreign. #delim ; local xb_for "_b[_cons] + _b[foreign] + _b[mpg]*mpg + _b[foreignXmpg]*mpg" ; #delim cr In that case we know that the the variable foreign has value 1, so _b[foreign]*foreign = _b[foreign]*1 = _b[foreign] similarly: _b[foreignXmpg]*foreign*mpg = _b[foreignXmpg]*1*mpg = _b[foreignXmpg]*mpg -- Maarten ----------------------------------------- Maarten L. Buis Department of Social Research Methodology Vrije Universiteit Amsterdam Boelelaan 1081 1081 HV Amsterdam The Netherlands visiting address: Buitenveldertselaan 3 (Metropolitan), room Z434 +31 20 5986715 http://home.fsw.vu.nl/m.buis/ ----------------------------------------- ___________________________________________________________ Yahoo! Answers - Got a question? Someone out there knows the answer. Try it now. http://uk.answers.yahoo.com/ * * For searches and help try: * http://www.stata.com/support/faqs/res/findit.html * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

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