Ivan Balducci <[EMAIL PROTECTED]> wrote:
> I would like to understand the meaning of negative Cohen´s Kappa value
> (1960). I got it from the following data (from Dental Radiology):
> Magnetic resonance versus Facial Pain Total
> Yes No
> Yes 1 4 5
> No 11 30 41
> Total 12 34 46
> Kappa = - 0,0422
> My concern is: are negative Kappa values less important than random
> agreement or they mean something else?
They mean that the agreement is actually worse than chance. Note that the
odds ratio is .68, which is a significant, though weak (Yule's Q=.19)
*negative* association. You can't expect any agreement under those
circumstances.
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