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1. Quartiles (score: 1): Author: "Heeringa W.J." <heeringa@let.rug.nl>; Date: Fri, 7 Dec 2001 17:36:02 +0100; Dear S-PLUS users, Assume I have the following range: 1 2 3 4 5 6 Next I calculated the 1st Quartile, the median and the 3rd Quartile in both, S-PLUS and SPSS: 1st Quartile : S-PLUS: 2.25 and SPSS: 1; /archives/html/s-news/2001-12/msg00068.html (7,379 bytes)
2. Re: Quartiles (score: 1): Author: Prof Brian Ripley <ripley@stats.ox.ac.uk>; Date: Fri, 7 Dec 2001 16:32:19 +0000 (GMT); Why don't you send a bug report to SPSS if they don't explain their results? If it's not in the on-line help it is a bug, but for S-PLUS it *is* there. There are several slightly different definition; /archives/html/s-news/2001-12/msg00070.html (8,836 bytes)
3. Re: Quartiles (score: 1): Author: "Dr. M.Sawada" <msawada@uottawa.ca>; Date: Fri, 7 Dec 2001 11:53:54 -0500; Incidentally, MS Excel uses the same quantile algorithm as S+ - and Bill Gates is never wrong. Dr. M.Sawada Assistant Professor, GIS University of Ottawa Dept. Geography P.O. Box 450 Stn. A Ottawa, O; /archives/html/s-news/2001-12/msg00072.html (9,962 bytes)
4. Re: Quartiles (score: 1): Author: "Monder, Harvey" <Harvey.Monder@pharma.com>; Date: Fri, 7 Dec 2001 13:15:49 -0500; And in SAS, Proc Univariate provides 5 algorithms (pctldef), the fourth producing the same results as SPSS, but none of them producing the results in Splus. (As to the rightness or wrongness of SAS,; /archives/html/s-news/2001-12/msg00075.html (10,502 bytes)
5. Re: Quartiles (score: 1): Author: "Edward Malthouse" <ecm@casbah.it.northwestern.edu>; Date: Fri, 7 Dec 2001 12:42:28 -0600 (CST); See Hyndman and Fan (1996), "Sample quantiles in statistical packages," American Statistician, Vol 50, number 4, pp-361-365. If I recall correctly, they give about 9 different definitions of quantile; /archives/html/s-news/2001-12/msg00077.html (12,971 bytes)
6. Re: Quartiles (score: 1): Author: Prof Brian Ripley <ripley@stats.ox.ac.uk>; Date: Fri, 7 Dec 2001 19:09:18 +0000 (GMT); Better for what? (Not that we were discussing SAS.) Nope: they *were* and are consistent. They are printed to different numbers of significant digits. See Min. 1st Qu. Median Mean 3rd Qu. Max. 8.00 9; /archives/html/s-news/2001-12/msg00078.html (9,202 bytes)
7. Re: Quartiles (score: 1): Author: "Edward Malthouse" <ecm@casbah.it.northwestern.edu>; Date: Fri, 7 Dec 2001 13:55:30 -0600 (CST); On page 364 of the Hyndman and Fan they state "Splus: the quantile() command of Splus 3.1 uses [definition 7] (although S-PLUS(1991) states that [definition 5] is used)." Definition 5 satisfies all; /archives/html/s-news/2001-12/msg00079.html (10,314 bytes)
8. Re: Quartiles (score: 1): Author: "Edward Malthouse" <ecm@casbah.it.northwestern.edu>; Date: Fri, 7 Dec 2001 14:03:04 -0600 (CST); I neglected to tell what desirable property 5 in Hyndman and Fan was in my previous email (the Splus definition of quantiles does not satisfy this one but the one that SPSS seems to use and PCTLDEF=4; /archives/html/s-news/2001-12/msg00080.html (8,159 bytes)
9. Re: Quartiles (score: 1): Author: Rick Chappell <chappell@biostat.wisc.edu>; Date: Mon, 10 Dec 2001 10:11:54 -0600 (CST); There has been some discussion, initiated by W.J. Heeringa, on the definitions of quar(n)tiles used by various statistical packages. I have found the following reference useful in this regard, though; /archives/html/s-news/2001-12/msg00095.html (7,820 bytes)

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