Friday, March 03, 2006

RE: st: Multinomial logit in stata

Alan and Albert Inference could be done if the unit of analysis is cities (in Alberts example), e.g. proportion of city budget spent on categories 1, 2, 3, 4, and 5. If you wanted to do the inference on lower level units (individuals/companies/dogs who choose to buy/eat hotdog brand 1, 2, 3, 4, or 5 within cities) than the problem is even more severe than Alan's remark suggest: than you also have the ecological inference problem. See for example: http://www.stat.columbia.edu/~cook/movabletype/archives/2006/03/the_ecological.html . Note that the Papke and Wooldridge paper I reccomended falls in the ecological inference trap. HTH, Maarten

--- "Feiveson, Alan H. (JSC-SK311)" <alan.h.feiveson@nasa.gov> wrote: > Unless you had repeated observations for the same covariate pattern, I > don't see how proportions alone would be enough information to do proper > inference. Those same proportions could have arisen from 100, 1000 or > 100000 observations. Clearly the inference would be different for those > situations.

----------------------------------------- between 1/2/2006 and 31/3/2006 I will be visiting the UCLA, during this time the best way to reach me is by email

Maarten L. Buis Department of Social Research Methodology Vrije Universiteit Amsterdam Boelelaan 1081 1081 HV Amsterdam The Netherlands

visiting adress: Buitenveldertselaan 3 (Metropolitan), room Z214

+31 20 5986715

http://home.fsw.vu.nl/m.buis/ -----------------------------------------

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