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[project @ 1998-10-29 05:23:08 by jwe]
author jwe
date Thu, 29 Oct 1998 05:23:09 +0000
parents
children eb27ea9b7ff8
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1 ## Copyright (C) 1995, 1996, 1997 Kurt Hornik
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2 ##
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3 ## This program is free software; you can redistribute it and/or modify
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4 ## it under the terms of the GNU General Public License as published by
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5 ## the Free Software Foundation; either version 2, or (at your option)
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6 ## any later version.
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7 ##
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8 ## This program is distributed in the hope that it will be useful, but
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9 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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10 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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11 ## General Public License for more details.
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12 ##
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13 ## You should have received a copy of the GNU General Public License
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14 ## along with this file. If not, write to the Free Software Foundation,
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15 ## 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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16
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17 ## usage: S = statistics (X)
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18 ##
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19 ## If X is a matrix, return a matrix S with the min, first quartile,
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20 ## median, third quartile, max, mean, std, skewness and kurtosis of the
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21 ## columns of X as its rows.
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22 ##
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23 ## If X is a vector, treat it as a column vector.
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24
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25 ## Author: KH <Kurt.Hornik@ci.tuwien.ac.at>
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26 ## Description: Compute basic statistics
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27
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28 function S = statistics (X)
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29
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30 if (nargin != 1)
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31 usage ("S = statistics (X)");
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32 endif
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33
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34 if (prod (size (X)) > 1)
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35 if (is_vector (X))
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36 X = reshape (X, length (X), 1);
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37 endif
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38 for k=1:columns(X)
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39 S(:,k) = [min (X(:,k)); empirical_inv ([0.25;0.5;0.75], X(:,k));
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40 max (X(:,k)); mean (X(:,k)); std (X(:,k));
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41 skewness (X(:,k)); kurtosis (X(:,k))];
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42 endfor
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43 else
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44 error ("statistics: invalid argument");
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45 endif
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46
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47 endfunction