[18968] in s-news-athena
RE: [S] sample size!!!
daemon@ATHENA.MIT.EDU (SmithSJ@mar.dfo-mpo.gc.ca)
Wed Aug 18 12:10:03 1999
From: SmithSJ@mar.dfo-mpo.gc.ca
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Date: Wed, 18 Aug 1999 13:04:42 -0300
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Yours is not an SPLUS question.
Determine sample size for what criterion? That is, minimum variance or
minimum cost or a function of both. Check with the standard sampling texts,
e.g.,
@BOOK{Cochran77,
author = {W. G. Cochran},
year = 1977,
title = {Sampling Techniques},
publisher = {{John Wiley \& Sons}},
address = {New York, N.Y.}
}
@BOOK{Thompson92,
author = "Steven K. Thompson",
title = " Sampling",
year = "1992",
publisher = "{John Wiley \& Sons}",
address = "New York, N.Y.",
pages = "343~p."
}
Stephen Smith
> -----Original Message-----
> From: du doan [SMTP:cs10ap@yahoo.com]
> Sent: Wednesday, August 18, 1999 12:29 PM
> To: s-news@wubios.wustl.edu
> Subject: [S] sample size!!!
>
>
> I have a question about stratified sampling technique.
>
> We want to know how to determine a total sample size and sample size
> for each stratum.
> Here are the data:
>
> amount: count %size %amount amount
> 0-9 43117 77.49 2.06 68.6k
> 10-99 8595 15.45 8.64 288.3K
> 100-500 2792 5.02 18.77 626.3K
> 500-999 572 1.03 12.16 405.7K
> 1K-2999 403 .72 19.21 641.1K
> 3K-4999 74 .13 8.37 279.5K
> 5K-6999 33 .06 5.85 195.4K
> 7K-10K 26 .05 6.50 217.0K
> >10K 33 .06 18.45 615.7K
>
> Total 55645 100 100.00 3337.7K
>
> We are just thinking of using equal-cumulative-square-root-of-frequency
> to determine stratum boundaries. Is this thought correct??? How can we
> determine the total sample size and sample size for each stratum
> without info of standard deviation?
>
> Thanks in advance for any suggestion.
>
> Cheer,
> Du Doan.
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