one more question,

"The third value (kappa (2*PA-1)) is adjusted for prevalence using the
method proposed by Byrt, Bishop and Carlin (1993)"  --- from ?cohen.kappa

What does the "prevalence" refer to?
On Sun, Sep 7, 2008 at 10:43 PM, Weiwei Shi <helprhelp@gmail.com> wrote:

> Dear all,
>
> I have a question on Cohen's kappa:
>
> Assume I have two datasets, one has 500 objects, 10 methods and the other,
> 1000 different objects, 20 different methods. Could I compare between the
> two datasets to conclude the 10 methods are more "concordant" than the 20
> ones by looking at some output, for example, cohen.kappa{concord} ?
>
> One more, could anyone explain in brief, what's the difference between
> kappa(Cohen) and kappa(Siegel)?
>
> Thanks,
>
>
> --
> Weiwei Shi, Ph.D
> Research Scientist
> GeneGO, Inc.
>
> "Did you always know?"
> "No, I did not. But I believed..."
> ---Matrix III
>



-- 
Weiwei Shi, Ph.D
Research Scientist
GeneGO, Inc.

"Did you always know?"
"No, I did not. But I believed..."
---Matrix III

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