## 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: S = statistics (X) ## ## If X is a matrix, return a matrix S with the min, first quartile, ## median, third quartile, max, mean, std, skewness and kurtosis of the ## columns of X as its rows. ## ## If X is a vector, treat it as a column vector. ## Author: KH <Kurt.Hornik@ci.tuwien.ac.at> ## Description: Compute basic statistics function S = statistics (X) if (nargin != 1) usage ("S = statistics (X)"); endif if (prod (size (X)) > 1) if (is_vector (X)) X = reshape (X, length (X), 1); endif for k=1:columns(X) S(:,k) = [min (X(:,k)); empirical_inv ([0.25;0.5;0.75], X(:,k)); max (X(:,k)); mean (X(:,k)); std (X(:,k)); skewness (X(:,k)); kurtosis (X(:,k))]; endfor else error ("statistics: invalid argument"); endif endfunction

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