## Copyright (C) 1995, 1996, 1997 Kurt Hornik ## ## This program is free software; you can redistribute it and/or modify ## it under the terms of the GNU General Public License as published by ## the Free Software Foundation; either version 2, or (at your option) ## any later version. ## ## This program is distributed in the hope that it will be useful, but ## WITHOUT ANY WARRANTY; without even the implied warranty of ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU ## General Public License for more details. ## ## You should have received a copy of the GNU General Public License ## along with this file. If not, write to the Free Software Foundation, ## 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. ## usage: iqr (x) ## ## If x is a vector, return the interquartile range, i.e., the ## difference between the upper and lower quartile, of the input data. ## ## If x is a matrix, do the above for each column of x. ## Author KH <Kurt.Hornik@ci.tuwien.ac.at> ## Description: Interquartile range function y = iqr (x) if (nargin != 1) usage ("iqr (x)"); endif y = empirical_inv (3/4, x) - empirical_inv (1/4, x); endfunction

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