On 3 Samh 2009, at 22:27, Jackson, Theron Keith (UMSL-Student) wrote:
I am in need of help. I am needing to calculate a kappa statistic;
however, one of my raters only has one rating. Rater one has only
one rating because it is the correct rating.
Rater 1 (Drug Test) 2 for positive
Rater 2 (Self-Reports) 1 for negative, and 2 for positive
Are you telling us that you have only three participants? Then the
advice is to get more.
Or are you telling us that the drug test has only one rating
(positive) because it is correct? In this case, your whole sample is
made up of true positives. In a case like this, kappa is
inappropriate. The level of agreement reduces to the proportion of
self-reports (rating 2) which are positive.
Ronan Conroy
=================================
[email protected]
Royal College of Surgeons in Ireland
Epidemiology Department,
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+353 (0)1 402 2431
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http://rcsi.academia.edu/RonanConroy
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