Re: st: Query for Statalist on kappa

[Ron�n Conroy <rconroy@rcsi.ie>]

On 17 Noll 2006, at 06:10, Meredith Makeham wrote:

> In addition, the third level of the code has a few cells with very  
> small values in them (<5), and three of the outcomes for code 1 at  
> level 3, and one for code 2 at level 3, have a negative value for  
> their individula kappa statistic.  What does this mean, and should  
> I not be doing this test if the cell size is smaller than a certain  
> number?
A negative kappa means that the raters disagreed more than you would  
expect by chance alone. They may have been married.

I would recommend thinking about Lin's concordance coefficient, since  
your data are ordinal; check out -concord-.



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Ron�n Conroy
Royal College of Surgeons in Ireland
rconroy@rcsi.ie
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