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From |
Maarten buis <maartenbuis@yahoo.co.uk> |

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

Subject |
st: Re: Excuse me, just a question about chi-square test. |

Date |
Thu, 12 Mar 2009 14:02:42 +0000 (GMT) |

--- On Thu, 12/3/09, Xu Kaikuo wrote to me privately: > I saw your discussions on > http://www.stata.com/statalist/archive/2007-09/msg00575.html, > so I think you could provide some clue to my question. This > is a abstract of my problem, but not the real one. > Assume we have two kind of fridges A and B, and a function > set F = {f1,f2...,fn} and each function has its corresponding > weight W = {w1,w2,...,wn}, I want test whether difference exist > between A and B on cover the functions in F. > > 1 I know that without the weight, we could do it like this: > First create the 2*2 table > A B > covered functions a c > uncover functions b d > > Then use chi-square test. > But with the weight, what should I do. > > 2 How to test whether A covers more functions than B > considering the weight. First of all it is better to respond to the list than to individual members privately, as is discussed on the statalist FAQ, point 5: http://www.stata.com/support/faqs/res/statalist.html#private As to question 1: -tab- allows weights, see: -help tab-. As to question 2: In that case you probably want to do a logistic regression, with fridge type as an explanatory variable. Hope this helps, Maarten ----------------------------------------- Maarten L. Buis Institut fuer Soziologie Universitaet Tuebingen Wilhelmstrasse 36 72074 Tuebingen Germany http://home.fsw.vu.nl/m.buis/ ----------------------------------------- * * 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/

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