Re: Cohen's Ecologic Studies (R-squared)

[BERNARD L COHEN <blc+@PITT.EDU>]

On Mon, 3 Jun 2002 epirad@mchsi.com wrote:



> If you hope to determine if the relationship is linear

> or not between radon exposure and lung cancer, you need

> to be able to account for smoking.  I would have more

> confidence that he could account for smoking if he was

> able to show that his surrogate measures for county

> averaged smoking rates could at least help to predict

> the lung cancers within the county.  The low r-squared

> value indicates to me that he is not able to adequately

> account for smoking.



	--I have responded to this in several other e-mails sent this

morning.



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