Re: [R] sample size estimation for count (poisson?) data?

From: David Winsemius <dwinsemius_at_comcast.net>
Date: Wed, 12 Nov 2008 18:41:00 -0500

The first hit for search on "sample size" and "poisson" on Baron's search engine web interface appears on target:

http://search.r-project.org/cgi-bin/namazu.cgi?query=%22sample+size%22+poisson&max=100&result=normal&sort=score&idxname=functions&idxname=Rhelp02a

Getting the same result from your console window requires a couple of extra back-slashes:

 > RSiteSearch(""sample size" poisson")
Error: syntax error
 > RSiteSearch("\"sample size\" poisson") A search query has been submitted to http://search.r-project.org The results page should open in your browser shortly.

-- 
David Winsemius
Heritage Labs


On Nov 12, 2008, at 2:46 PM, Shawn Morrison wrote:


> Is there a function in R that will allow me to estimate the sample
> size required from count data (poisson data?), given the known
> variance and desired margin of error and confidence interval?
>
> My specific data set will be based on a survey of hikers that will be
> asked about the number of animals of species 'x' they observed during
> a given period. I need to know the number of hikers to interview. ie,
> I would like to calculate the mean number of species 'x' +/- margin of
> error with 95% confidence.
>
> This is a simple exercise for normally distributed continuous data,
> but I'm running into roadblocks for count data.
>
> Sincerely,
> Shawn Morrison
> [[alternative HTML version deleted]]
>
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______________________________________________ R-help_at_r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Received on Wed 12 Nov 2008 - 23:45:04 GMT

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