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st: composite kappa & intercenter variability in kappas
We submitted a manuscript comparing two observers measuring 10 dicotomous
variables. We measured kappa, to assess concordance between observers. A
reviewer asked that we calculate an overall value (composite) of the
kappas, for all 10 variables. (Fleiss, Stat Methods for Rates and
Proportions, 2nd or 3rd edition).
I couldn't find such a function in stata (overall kappa). Would there be
another way to calculate this other than by hand?
Also, the study was completed at 5 different hospitals. The reviewer
asked that we take into account hospital to hospital variation when
calculating kappas. I wasn't aware that kappas could be adjusted for the
5 hospitals, other than generating a large matrix of kappas corresponding
to the different hospitals. Would there be a way to take into account the
variation in agreement among the hospitals when estimating the kappas?
Richard Lenhardt, MD, MPH
Assistant Professor of Medicine
Division of Pulmonary and Critical Care Medicine
Rush University Medical Center
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