>From http://webdocs.cs.ualberta.ca/~smillie/Jpage/jsp601.ijs
require 'stats' Q2=: median Q1=: [: Q2 ] #~ Q2 > ] Q3=: [: Q2 ] #~ Q2 < ] NB. Summaries five=: <./,Q1,Q2,Q3,>./ five 1 3 4 6 9 1 2 4 7.5 9 On May 6, 2014 12:51 AM, "Kip Murray" <[email protected]> wrote: > The list 6 9 3 1 has left and right sublists 6 9 and 3 1, the list 6 9 3 1 > 4 has left and right sublists 6 9 and 1 4 . The middle number, if there is > one, is not included in the left and right sublists. > > You know the median of 6 9 3 1 is the median of 1 3 6 9 which is 4.5, and > the median of 6 9 3 1 4 is the median of 1 3 4 6 9 which is 4. > > The "fourths" f1 and f4 of a list y are respectively the medians of the > left sublist and right sublist of /:~ y . > > Write a verb to find John Tukey's "five number summary" minimum , f1 , > median, f3 , maximum of a list y. > > --Kip Murray > > > -- > Sent from Gmail Mobile > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm > ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
