This is not an odds ratio. You simply calculated 27/131 = .206, which is the
odds of having the disease given <40%. You can calculate a confidence interval
for this with:
exp(log(27/131) - 1.96 * sqrt(1/27 - 1/(27+131)))
exp(log(27/131) + 1.96 * sqrt(1/27 - 1/(27+131)))
which yields (0.146, 0.291).
Wolfgang
________________________________________
From: r-help-boun...@r-project.org [r-help-boun...@r-project.org] On Behalf Of
C W [tmrs...@gmail.com]
Sent: Tuesday, August 14, 2012 9:06 PM
To: Nordlund, Dan (DSHS/RDA)
Cc: r-help
Subject: Re: [R] What package to use to calculate odds ratio and the confidence
interval?
The table did not come out on rich text format.
So what I wrote was,
<40% >40% Total
No disease 131 75 206
Have diease 27 6 33
239
My odds ratio: 27/(27+131))/(131/(27+131)) = 0.206
I am looking for the confidence interval.
Mike
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