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Re: st: diagt and accuracy


From   Heather Gold <heg2001@med.cornell.edu>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: diagt and accuracy
Date   Wed, 08 Jun 2005 13:25:14 -0400

Oops, the first line was cut off.
I meant to write that diagt defines accuracy as (sensitivity+specificity)/2.
Has anyone heard of accuracy defined as (prevalence*sensitivity+(1-prevalence)*specificity) ? This is like a weighted average that incorporates prevalence and might be helpful with a dichotomous diagnostic test (ie, rather than ROC). If so, is there a standard depending on one's field, eg, medicine?

Thanks,
Heather

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