Mercurial > dive4elements > river

annotate artifacts/src/main/java/org/dive4elements/river/artifacts/math/StdDevOutlier.java @ 5863:4897a58c8746

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River artifacts: Added new copyright headers.
author Sascha L. Teichmann <teichmann@intevation.de>
date Sun, 28 Apr 2013 14:40:59 +0200
parents 5aa05a7a34b7
children af13ceeba52a
rev   line source
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4897a58c8746 River artifacts: Added new copyright headers.
Sascha L. Teichmann <teichmann@intevation.de>
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1 /* Copyright (C) 2011, 2012, 2013 by Bundesanstalt für Gewässerkunde
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2 * Software engineering by Intevation GmbH
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3 *
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4 * This file is Free Software under the GNU AGPL (>=v3)
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5 * and comes with ABSOLUTELY NO WARRANTY! Check out the
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6 * documentation coming with Dive4Elements River for details.
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7 */
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8
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9 package org.dive4elements.river.artifacts.math;
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10
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11 import java.util.List;
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12
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13 import org.apache.commons.math.stat.descriptive.moment.StandardDeviation;
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14
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15 import org.apache.log4j.Logger;
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16
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17 public class StdDevOutlier
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18 {
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19 public static final double DEFAULT_FACTOR = 3;
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20
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21 private static Logger log = Logger.getLogger(StdDevOutlier.class);
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22
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23 protected StdDevOutlier() {
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24 }
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25
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26 public static Integer findOutlier(List<Double> values) {
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27 return findOutlier(values, DEFAULT_FACTOR, null);
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28 }
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29
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30 public static Integer findOutlier(
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31 List<Double> values,
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32 double factor,
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33 double [] stdDevResult
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34 ) {
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35 boolean debug = log.isDebugEnabled();
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36
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37 if (debug) {
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38 log.debug("factor for std dev: " + factor);
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39 }
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40
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41 int N = values.size();
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42
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43 if (debug) {
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44 log.debug("Values to check: " + N);
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45 }
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46
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47 if (N < 3) {
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48 return null;
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49 }
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50
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51 StandardDeviation stdDev = new StandardDeviation();
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52
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53 double maxValue = -Double.MAX_VALUE;
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54 int maxIndex = -1;
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55 for (int i = N-1; i >= 0; --i) {
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56 double value = Math.abs(values.get(i));
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57 stdDev.increment(value);
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58 if (value > maxValue) {
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59 maxValue = value;
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60 maxIndex = i;
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61 }
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62 }
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63
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64 double sd = stdDev.getResult();
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65
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66 double accepted = factor * sd;
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67
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68 if (debug) {
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69 log.debug("std dev: " + stdDev);
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70 log.debug("accepted: " + accepted);
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71 log.debug("max value: " + maxValue);
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72 }
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73
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74 if (stdDevResult != null) {
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75 stdDevResult[0] = sd;
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76 }
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77
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78 return maxValue > accepted ? maxIndex : null;
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79 }
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80 }
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81 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org