A simple question. I have written a simple bit of S+ to give me
confidence intervals for proportions based on the normal
approximation based on: Gardner, M. J., S. B. Gardner and P. D.
Winter (1989). Confidence Interval Analysis (C.I.A.) Microcomputer
Program Manual. London, British Medical Journal.
That refers to a better approximation for small n or min(p,1-p) being
small and gives a reference to Armitage and Berry (?) but I won't get
access to that for some time and I can't find anything to do this from
the obvious places (statlib...) It strikes me that someone somewhere
has probably written this or could point me to some WWW source
that will tell me what I need to do.
TIA,
Chris
Chris Evans <chris@psyctc.org>
Consultant Psychiatrist in Psychotherapy,
Rampton Hospital; Associate R&D Director,
Tavistock & Portman NHS Trust;
Hon. SL Institute of Psychiatry
*** My views are my own and not representative
of those institutions ***
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