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

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: table & chi-square from multiply imputed survey data (-ice-, -mim-) [repost] |

Date |
Wed, 4 Feb 2009 21:50:29 +0000 (GMT) |

--- On Wed, 4/2/09, Michael I. Lichter wrote: > I want to know how to generate a survey-adjusted chi-square > like that available from -svy: tab- using data multiply > imputed using -ice- (net sj 8-1 st0139). Even ignoring the survey adjustments this is a surprisingly difficult task. The reason is as follows: Multiple Imputation is designed for making inference on coefficients separately, not for making inference on multiple coefficients simultaneously. The chi-square test is such a simultaneous test: it tests whether all odds ratios that define the association within the table are simultaneously equal to one another. However, stuff has been done in this area, and some of it has been implemented in Stata as was discussed by Rose Medeiros at the 2008 Fall North American Stata Users' meeting: http://ideas.repec.org/p/boc/fsug08/11.html > I'd also be interested in suggestions about how to > tabulate these data. (E.g., would anybody complain if I > computed a mean imputed value for each variable for each > case, rounded them off, and reported that?) I wouldn't complain. <snip> > As far as I can tell, -mim- doesn't support -tab- or > -svy: tab-, and -svy: tab- itself doesn't support prefix > commands. I can try predicting A from B using -mlogit-, but > that seems silly. Actually, because this is such a surprisingly complicated problem you'll probably end up doing something like that. Alternatively, if that chi square statistic isn't crucial for your paper, I would probably just not bother with trying to compute such a statistic at all, and just report a table with the averaged counts. > I can manually do a tabulation for each > imputation and, I guess, average the chi-square statistics, > and, I dunno, subtract one degree of freedom, perhaps? This will not give you the correct coverage, as Rose discussed in her presentation. Hope this helps, 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 N515 +31 20 5986715 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/

**Follow-Ups**:**Re: st: table & chi-square from multiply imputed survey data (-ice-, -mim-) [repost]***From:*"Michael I. Lichter" <mlichter@buffalo.edu>

**References**:**st: table & chi-square from multiply imputed survey data (-ice-, -mim-) [repost]***From:*"Michael I. Lichter" <mlichter@buffalo.edu>

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