[R] prop.test() references
Marc Schwartz
marc_schwartz at comcast.net
Thu Feb 1 14:50:11 CET 2007
On Thu, 2007-02-01 at 07:22 +0100, Jean lobry wrote:
> Dear R-help,
>
> I'm using prop.test() to compute a confidence interval for a proportion
> under R version 2.4.1, as in:
>
> prop.test(x = 340, n = 400)$conf
> [1] 0.8103309 0.8827749
>
> I have two questions:
>
> 1) from the source code my understanding is that the confidence
> interval is computed according to Wilson, E.B. (1927) Probable
> inference, the law of succession, and statistical inference.
> J. Am. Stat. Assoc., 22:209-212.
> Is it correct?
Yes.
> 2) The doc says "Continuity correction is used only if it does not exceed
> the difference between sample and null proportions in absolute value."
> Does someone has a reference in which this point is discussed?
I believe that this is a modification by Newcombe. See:
Newcombe RG: Two-Sided Confidence Intervals for the Single Proportion:
Comparison of Seven Methods. Statistics in Medicine 1998;17:857-872.
Newcombe RG: Interval Estimation for the Difference Between Independent
Proportions: Comparison of Eleven Methods. Statistics in Medicine
1998;17:873-890.
HTH,
Marc Schwartz
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