Re: Cohen's ecological data: a test of LNT?

[Steve Frey <sfreyohp@SLAC.Stanford.EDU>]

Dr. Mossman -

Please help me interpret the below discussion point: are you 
asserting that Dr. Cohen's study is worthless, or even misleading?

Steve 
******************************************************
Steve Frey, Head
Operational Health Physics (OHP) Department
Stanford Linear Accelerator Center (SLAC)
Phone:(650) 926-3839 (office),
      (650) 926-3030 (fax),
E-mail address: sfreyohp@SLAC.Stanford.EDU
Any thoughts expressed here are not meant 
to speak for SLAC or any other party in any 
capacity unless so stated.
*******************************************************
At 12:27 PM 3/17/00 -0600, you wrote:
>This my last shot!
>
>Cohen and I agree that LNT is a causal relationship. Howevever, I am now
>totally confused about whether Cohen's data tests for a causal relationship.
>In his April 1997 paper in Health Physics (page 625), Cohen indicates that
>his data do not test for a causal relationship but has a much more limited
>objective. Now Cohen says that his data tests for a causal relationship.
>Which is  it? Either the data test for a causal relationship or thery don't!
>
>
>If the data test for a causal relationship, as Cohen now states, then the
>ecological fallacy becomes operative. If the data do not test for a causal
>relationbship, then the data are not a test of LNT because LNT is a causal
>relationship (as Cohen and I now agree).
>
>
>Kenneth L. Mossman
>Professor of Health Physics
>Director, Office of Radiation Safety
>Arizona State University
>Tempe, AZ 85287-3501
>Phone: 480.965.6190/0584
>Fax: 480.965.6609
>Cellular: 602.769.2371
>E-mail: ken.mossman@asu.edu
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