Re: Radon, Smoking,& LNT

[epirad@mchsi.com]

Dr. Cohen, as per your request below 



Some example are evident in this article -



http://www.hsph.harvard.edu/cancer/publications/reports/vol1_full_text/vol1_ses.

html



Please note that I frequently reference others peoples work - one can build on 

the existing base of information.  This is the scientific method.  My concern 

is that you never document your assumptions (for example the assumptions you 

used to derive your LNT model) by referencing others work, instead you tend to 

rely soley on your own work with the inherent limitations in the ecologic data. 



Regards, Bill Field

> 

> On Wed, 25 Jun 2003 epirad@mchsi.com wrote:

> 

> > One of the potential problems with such an analysis is that you are not

> > adjusting for the covariates of smoking at the same time or considering within

> > county non linearities.  This is a problem with ecologic data, no theoretical

> > concrete example is needed to support limitations of ecologic data.

> 

> 	--I need a concrete hypothetical example just to understand what

> you mean here. If I try to reply without one, you will say I do not

> understand your complaint. With a concrete hypothetical example, the can

> be no misunderstanding.

> 

>   In

> > addition, the smoking treatments you use do not account for smoking intensity

> > or duration effects.

> 

> 	--As I have said many times on this list, my treatment of smoking

> intensity is summarized in Sec. 4.4 of item #7 on my web site, and treated

> in detail in the reference given there.

> 	I could easily work out a treatment of effects of variations in

> smoking duration, but I don't think that would be publishable. If you

> would write a letter to the Editor on that issue, my response would be

> publishable, so I would take the time to work it out.

> 

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