Re: Cohen's ecologic study questions

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

On Tue, 22 Jan 2002, Field, R. William wrote:



> Dr. Cohen,

>

> We have given you many specific examples.

>

> For example, we have previously stated that you are performing your

> stratifications based on confounders at the individual level, not the group

> level.  Use aggregate level confounders for stratification if you want to

> improve your ecologic studies.



	--By "specific" I mean something that can be calculated if data

were available. Name something specific that you have suggested and that I

have not shown to be very highly implausible. Whether I use individual

level or group level confounders is irrelevant as long as I can convince

people that the specific suggestion is implausible.



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