Re: Ecologic versus Case-Control Studies, revisited

["R. William Field" <bill-field@uiowa.edu>]

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.  
>
>     
>