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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))); |
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40 (empirical_inv ([0.25;0.5;0.75], X(:,k))); |
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41 (max (X(:,k))); |
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42 (mean (X(:,k))); |
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43 (std (X(:,k))); |
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44 (skewness (X(:,k))); |
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45 (kurtosis (X(:,k)))]; |
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46 endfor |
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47 else |
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48 error ("statistics: invalid argument"); |
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49 endif |
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50 |
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51 endfunction |
