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)" <[email protected]> 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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