RE: Radon - county linear model and LNT

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

On Fri, 27 Jun 2003, Wesley wrote:

>

> Dr. Cohen uses the statistical method of stratification to evaluate

> confounders (co-variates). This method stratifies the counties into 5 or 10

> groups, each with similar values for the co-variate (e.g., dietary level of

> a specific nutrient). It is not necessary that co-variates be linear with

> lung cancer. All that is necessary is that the co-variate vary monotonically

> with lung cancer. That is, as the co-variate increases (or decreases) lung

> cancer also increases (or decreases).



	--I don't see why this monotonic behavior is necessary. Can you

explain?



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