Tukey used the name "fourths" because they are a little different from quartiles.
On Tuesday, May 6, 2014, Joe Bogner <[email protected]> wrote: > On Tue, May 6, 2014 at 4:33 PM, Kip Murray > <[email protected]<javascript:;>> > wrote: > > > jtfns 1 2 2 4 6 NB. correct > > 1 1.5 2 5 6 > > five 1 2 2 4 6 NB. doesn't work if repetitions in data > > 1 1 2 5 6 > > > > > On Tue, May 6, 2014 at 4:33 PM, Kip Murray > <[email protected]<javascript:;>> > wrote: > > > five 1 2 2 4 6 NB. doesn't work if repetitions in data > > 1 1 2 5 6 > > > > > It's interesting that R gives even a different result ( > http://en.wikipedia.org/wiki/Five-number_summary#Example_in_R) > > > z <- c(1,2,2,4,6) > > fivenum(z) > [1] 1 2 2 4 6 > > summary(z) > Min. 1st Qu. Median Mean 3rd Qu. Max. > 1 2 2 3 4 6 > > > For the 1st quartile, Excel gives 2 with QUARTILE.INC and 1.5 > with QUARTILE.EXC > For the 3rd, Excel gives 4 and 5 respectively > > So R is following the "INC" method > > http://stats.stackexchange.com/questions/28123/quartiles-in-excel is an > interesting read > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm > -- Sent from Gmail Mobile ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
