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- ## 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
-