Re: Ecologic versus Case-Control Studies, revisited

[Bob Hearn <rah@america.net>]

Please keep this discussion on the serveras these specific concerns apply
to a range of current activities in the industry.

Bob Hearn
rah@america.net

At 01:14 PM 2/28/98 -0600, R. William Field wrote:
>In order to move this thread off the listserv.  I will respond directly to
>you.
>
>Regards, Bill
>
>
>At 12:04 PM 2/28/98 -0600, you wrote:
>>In a message dated 98-02-27 12:43:14 EST, Bill Field writes:
>>
>><< When you collect more and more information from counties,
>> you don't get linear relationships between radon concentrations and dose to
>> the county population.  Biases are introduced that can not even be
>> measured, as the sample size gets larger these bias become magnified.  The
>> bias do not average out as you suggest, they get magnified.  >>
>>
>>        What evidence is there for the above statements?  I am not
>necessarily
>>disagreeing with you, just interested about the basis for the above.  It is
>>contrary to what I would expect.  
>>
>>     
>>
>
>