Re: Confounders and Coincidences

[epirad@mchsi.com]

Dr. Cohen wrote - 



> 

> 	--In my study, there is no need to do this. Ethnicities are among

> the confounding factors I treat. 

----------------------------------------------



Unfortunately, ecological control of a covariate contributing to ecologic bias 

is generally inadequate to remove the bias produced by the covariate even in 

the absence of measurement error. 



Bill Field

bill-field@uiowa.edu



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