Please read the relevant help pages: ?fivenum ?boxplot.stats Hint: Length of your data vector is an "even" number.
Ravi. ---------------------------------------------------------------------------- ------- Ravi Varadhan, Ph.D. Assistant Professor, The Center on Aging and Health Division of Geriatric Medicine and Gerontology Johns Hopkins University Ph: (410) 502-2619 Fax: (410) 614-9625 Email: [EMAIL PROTECTED] Webpage: http://www.jhsph.edu/agingandhealth/People/Faculty/Varadhan.html ---------------------------------------------------------------------------- -------- -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Schaefer, Robert L. Dr. Sent: Tuesday, October 09, 2007 11:20 AM To: [EMAIL PROTECTED] Subject: [R] Summary vs fivenum results for Q3 I've just started using R and am still a neophyte, but I found the following curious result. I'm using the current version of R (2.5.1 (2007-06-27) ). Why are the results for the third quartile different in the output from the summary and fivenum commands? For the following data set 457 514 530 530 538 560 687 745 745 778 786 790 792 821 821 822 822 828 845 850 886 886 886 913 1050 1050 1065 1065 1065 1065 1090 1130 Summary yields: Min. 1st Qu. Median Mean 3rd Qu. Max. 457.0 745.0 822.0 825.4 947.2 1130.0 While fivenum yields: [1] 457.0 745.0 822.0 981.5 1130.0 The third quartile is being correctly calculated in the fivenum command and incorrectly in the summary command. Bob +++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Robert L. Schaefer, Professor of Statistics Department of Mathematics and Statistics Miami University Oxford, Ohio 45056 (513) 529-3533 (513) 529-5818 (sec) [EMAIL PROTECTED] HTTP://WWW.USERS.MUOHIO.EDU/SchaefRL +++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ______________________________________________ R-help@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. ______________________________________________ R-help@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.
