A colleague has asked me to ask:
I am not aware of a correction/adjustment for Kappa for low prevalence
items, and
would be interested in this method and reference. However, intuitively, it
would
seem that a high prevalence item would use the same methodology, since Kappa is
based on a k by k table, and the calculations do not depend on which column/row
(marginals) were high/low or how they are labeled. If there are different
methods
posed to adjust/correct for Kappa statistics in high prevalence and low
prevalence
scenarios, I would like to review these for use in our current data.
Currently, I
resort to showing "percent agreement" in addition to Kappa when these situations
arise so that readers can interpret the biased Kappa.
Many thanks.
*************************************
Allan R. Meyers, Ph.D., Professor
Department of Health Services
Boston University Schools of Medicine and Public Health
Research Director,
New England Regional Spinal Cord Injury Center
715 Albany Street, TW-349
Boston, MA 02118, USA
Telephone: 617 638 4510
FAX: 617 638 5374
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|