Re: Re: wrong ruth

["John Williams" <JohnWi@law.com>]

Ruth,



I think that is the problem.  There just isn't really good county 

data on smoking prevalence.  Especially from 30 years ago which would 

have been the appropriate data for Cohen to use.  I have been told 

the BRFS collects summary data on that.  



That is one reason I favor case-control and prospective cohort 

studies.  You can get individual information on pack-rate smoked, 

year started smoking, years smoked, etc.  



The question also remains about why the strong inverse association 

between county smoking rates and county radon levels?



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