Andrew, David et al
Many thanks for your thought provoking contributions this week. However
reading these papers has left me with a problem that my inadequate
mathematics will not allow me to conquer alone.
Please be kind if I am asking the obvious but..
Why, when I calculate the CI's using the 'confidence interval derivation for
proportions' formula in
> http://www.jr2.ox.ac.uk:80/Bandolier/band18/b18-9.html
do the CI results bear no resemblance to the results in for instance,
http://www.acponline.org/journals/annals/01may97/numeric.htm
despite the NNT's themselves being OK. I have repeated this failure with
the results from several papers.
I am quite comfortable with CIs derived from SDs but am struggling with
CI's for the assocation equations.RR /ARR /NNT
I suspect I am being somewhat slow, and that the answer will be either
painfully easy or painfully difiicult, but equally obvious in either case.
Any and all help would be appreciated
Tony
University of Western Sydney, Macarthur
P.O. Box 555
Campbelltown
NSW 2560
Tel ++2 4620 3790
Mobile 0412 509 408
Fax ++2 4620 3792
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