Re: Dumb questions and comments on ecological/case studies

[BERNARD L COHEN <blc+@PITT.EDU>]

On Fri, 7 Jun 2002 epirad@mchsi.com wrote:



> Dr. Cohen,

>

> Since counties themselves do not smoke, then please

> explain to me how you can address this problem and

> covariates WITHIN each county associated with lung

> cancer such as socioeconomic status and other within

> county covariates?  The slope is just related to

> smoking, not all the covariates associated with smoking.



	I don't really understand your question, and especially the last

sentence. But I will address such questions if you propose a way in which

they can affect the relationship among my principal variables, lung cancer

rates, smoking prevalence,  and average radon levels in a county. Unless

this relationship is  affected, confounders on the level of individuals

 do not matter.



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