[R] Summary vs fivenum results for Q3
Schaefer, Robert L. Dr.
schaefrl at muohio.edu
Tue Oct 9 17:20:19 CEST 2007
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
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Robert L. Schaefer, Professor of Statistics
Department of Mathematics and Statistics
Miami University
Oxford, Ohio 45056 (513) 529-3533 (513) 529-5818 (sec)
SchaefRL at MUOhio.Edu HTTP://WWW.USERS.MUOHIO.EDU/SchaefRL
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