Mercurial > dive4elements > river

annotate artifacts/src/main/java/org/dive4elements/river/artifacts/model/sq/Outlier.java @ 5838:5aa05a7a34b7

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Rename modules to more fitting names.
author Sascha L. Teichmann <teichmann@intevation.de>
date Thu, 25 Apr 2013 15:23:37 +0200
parents flys-artifacts/src/main/java/org/dive4elements/river/artifacts/model/sq/Outlier.java@bd047b71ab37
children 4897a58c8746
rev   line source
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1 package org.dive4elements.river.artifacts.model.sq;
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2
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3 import org.dive4elements.river.artifacts.math.GrubbsOutlier;
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4 import org.dive4elements.river.artifacts.math.StdDevOutlier;
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5
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6 import java.util.ArrayList;
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7 import java.util.List;
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8
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9 import org.apache.commons.math.MathException;
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10
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11 import org.apache.log4j.Logger;
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12
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13 public class Outlier
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14 {
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15 private static Logger log = Logger.getLogger(Outlier.class);
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16
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17 private static final String GRUBBS = "outlier.method.grubbs";
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18
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19 //private static final String STD_DEV = "std-dev";
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20
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21 public interface Callback {
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22
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23 void initialize(List<SQ> sqs) throws MathException;
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24
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25 double eval(SQ sq);
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26
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27 void iterationFinished(
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28 double stdDev,
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29 SQ outlier,
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30 List<SQ> remaining);
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31
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32 } // interface Callback
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33
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34 public static void detectOutliers(
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35 Callback callback,
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36 List<SQ> sqs,
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37 double stdDevFactor,
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38 String method
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39 )
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40 throws MathException
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41 {
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42 boolean debug = log.isDebugEnabled();
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43
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44 if (method == null) {
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45 method = "std-dev";
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46 }
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47
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48 if (debug) {
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49 log.debug("stdDevFactor: " + stdDevFactor);
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50 log.debug("method: " + method);
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51 }
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52
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53 List<SQ> data = new ArrayList<SQ>(sqs);
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54
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55 double [] stdDev = new double[1];
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56
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57 boolean useGrubbs = method.equals(GRUBBS);
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58
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59 if (useGrubbs) {
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60 stdDevFactor = Math.max(0d, Math.min(stdDevFactor/100d, 1d));
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61 }
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62
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63 List<Double> values = new ArrayList<Double>(data.size());
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64
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65 while (data.size() > 2) {
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66
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67 callback.initialize(data);
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68
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69 for (SQ sq: data) {
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70 values.add(callback.eval(sq));
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71 }
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72
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73 Integer ndx = useGrubbs
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74 ? GrubbsOutlier.findOutlier(values, stdDevFactor, stdDev)
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75 : StdDevOutlier.findOutlier(values, stdDevFactor, stdDev);
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76
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77 if (ndx == null) {
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78 callback.iterationFinished(stdDev[0], null, data);
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79 break;
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80 }
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81
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82 SQ outlier = data.remove(ndx.intValue());
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83 if (debug) {
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84 log.debug("stdDev: " + stdDev[0]);
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85 log.debug("removed " + ndx +
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86 "; S: " + outlier.getS() + " Q: " + outlier.getQ());
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87 }
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88 callback.iterationFinished(stdDev[0], outlier, data);
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89 values.clear();
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90 }
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91 }
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92 }
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93 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org