I wonder if any member(s) could help me with the following problem:
With a campylobacter project that I am currently involved in we take 14
swabs from individual broilers within one broiler house at a point in
time (defined as a case). Swabs are usually all negative or all
positive but could be of different strains.
Would it be possible to work out as to how many cases we would have to
look at to show that there is a 95% probability that all swabs within a
case are of the same type?
We would like to work this out assuming that if campylobacter is
present then there is a 25% chance that it is strain A and 75% that it
is some other strain.
In anticipation,
Alan Gordon,
Biometrics Division,
DARD (NI).
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