Dear Statalisters
I have a question on calculating power from incidence rates per 100.000
person years.
Is it possible? I only have this information for two groups: incidence
rates of breast cancer of 27.2 and 25.5 / 100.000 years and a p value
from a fishers exact test p=.84.
I want to determine the relative risk of breast cancer that I have 80%
power to detect?
Kind regards
Maren Weischer,
Dept of Clinical Biochemistry,
Herlev University Hospital.
Denmark
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