Re: Sampling using summay data

[Bernard L Cohen <blc+@pitt.edu>]

On Fri, 23 Feb 2001, Harry Hinks wrote:

> It is in the math.  I didn't realize Prof. Cohen performed statistical 
> sampling when choosing which house to test in a given area?  I thought the 
> data set came from individuals who wanted to test for radon becasue of 
> health concerns or thought they may be living in a high radon area. I wonder 
> if people who have increased concern about their health would have lower 
> cancer rates?

	-Several pages of my papers deal with the issue of justifying my
average radon levels in various counties. I can give references if
desired.
Basically they deal with correlations between results from various studies
done by different state agencies, EPA, and careful random selection
studies done by my group, and my entire file of measurements filtered for
elimination of the type of bias you suggest. 
I was really shocked to find how close these correlations were, and that
is what made me go on with this study.

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