Re: Ecologic versus Case-Control Studies, revisited

[Holloway3 <Holloway3@aol.com>]

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.