Re: Cohen's Ecologic Studies

[epirad@mchsi.com]

Dr. Cohen,



I can't see how it implies anything else, especially 

since you have no "within county" information concerning 

covariate distributions and potential individual level 

or group level confounders.  



Bill Field

> 

> On Mon, 3 Jun 2002 epirad@mchsi.com wrote:

> 

> > Since you use mean rates for the county that carries

> > with it the baggage of assuming linear relationships

> > within county.

> 

> 	--How does the mean rate imply assuming a linear relationship?

> 

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