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st: RE: Kappa query - unequal distribution of scores


From   "Downs, Sara" <Sara.Downs@ahvla.gsi.gov.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: Kappa query - unequal distribution of scores
Date   Thu, 22 Sep 2011 10:06:04 +0100

Hi,
 
I am trying to calculate agreement between 2 distributions of scores.
There are 3 possible scores: One score predominates and the other 2 are
extremely rare :
 
  tab rev1 rev2
 
           |               rev2
      rev1 |         0          1          2 |     Total
-----------+---------------------------------+----------
         0 |         1          6          0 |         7 
         1 |        13         57          3 |        73 
         2 |         0          2          1 |         3 
-----------+---------------------------------+----------
     Total |        14         65          4 |        83 
 

.         kap rev1 rev2
 
             Expected
Agreement   Agreement     Kappa   Std. Err.         Z      Prob>Z
-----------------------------------------------------------------
  71.08%      70.47%     0.0206     0.0852       0.24      0.4042

 
I understand that the usual kappa statistic is not reliable in this
situation .   Is there any way in STATA that I can adjust for the high
expected frequency. I am using STATA 10.1.
 
Thanks for any advice
 
Sara
 
 
 
Dr Sara Downs
CERA (Centre for Epidemiology & Risk Analysis)
Veterinary Laboratories Agency - Weybridge
New Haw
Addlestone
Surrey
KT15 3NB
United Kingdom
 
Phone: +44 (0) 1932 357893
Fax: +44 (0) 1932 357406
x2893
 
Animal Health and Veterinary Laboratories Agency (AHVLA)
 
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