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annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/model/sq/Outlier.java @ 4795:8ee270a3ef25

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Small code cleanups in S/Q outlier tests.
author Sascha L. Teichmann <teichmann@intevation.de>
date Fri, 11 Jan 2013 22:16:22 +0100
parents a7d080347ac3
children 846b0441f905
rev   line source
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1 package de.intevation.flys.artifacts.model.sq;
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2
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3 import de.intevation.artifacts.common.utils.Config;
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4
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5 import de.intevation.flys.artifacts.math.GrubbsOutlier;
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6 import de.intevation.flys.artifacts.math.StdDevOutlier;
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7
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8 import java.util.ArrayList;
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9 import java.util.List;
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10
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11 import org.apache.commons.math.MathException;
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13 import org.apache.log4j.Logger;
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15 public class Outlier
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16 {
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17 private static Logger log = Logger.getLogger(Outlier.class);
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18
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19 private static final String OUTLIER_METHOD =
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20 "/artifact-database/options/minfo-sq/outlier-method/@name";
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21
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22 private static final String GRUBBS = "grubbs";
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24 //private static final String STD_DEV = "std-dev";
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26 public interface Callback {
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28 void initialize(List<SQ> sqs) throws MathException;
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30 double eval(SQ sq);
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32 void iterationFinished(
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33 double stdDev,
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34 SQ outlier,
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35 List<SQ> remaining);
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36
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37 } // interface Callback
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39 public static void detectOutliers(
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40 Callback callback,
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41 List<SQ> sqs,
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42 double stdDevFactor
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43 )
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44 throws MathException
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45 {
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46 boolean debug = log.isDebugEnabled();
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47
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48 String method = Config.getStringXPath(OUTLIER_METHOD);
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49
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50 if (method == null) {
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51 method = "std-dev";
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52 }
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53
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54 if (debug) {
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55 log.debug("stdDevFactor: " + stdDevFactor);
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56 log.debug("method: " + method);
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57 }
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58
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59 List<SQ> data = new ArrayList<SQ>(sqs);
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61 double [] stdDev = new double[1];
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62
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63 boolean useGrubbs = method.equals(GRUBBS);
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64
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65 if (useGrubbs) {
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66 stdDevFactor = Math.max(0d, Math.min(stdDevFactor/100d, 1d));
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67 }
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68
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69 List<Double> values = new ArrayList<Double>(data.size());
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70
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71 while (data.size() > 2) {
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73 callback.initialize(data);
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74
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75 for (SQ sq: data) {
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76 values.add(callback.eval(sq));
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77 }
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78
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79 Integer ndx = useGrubbs
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80 ? GrubbsOutlier.findOutlier(values, stdDevFactor, stdDev)
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81 : StdDevOutlier.findOutlier(values, stdDevFactor, stdDev);
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82
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83 if (ndx == null) {
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84 callback.iterationFinished(stdDev[0], null, data);
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85 break;
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86 }
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87
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88 SQ outlier = data.remove(ndx.intValue());
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89 if (debug) {
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90 log.debug("stdDev: " + stdDev[0]);
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91 log.debug("removed " + ndx +
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92 "; S: " + outlier.getS() + " Q: " + outlier.getQ());
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93 }
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94 callback.iterationFinished(stdDev[0], outlier, data);
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95 values.clear();
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96 }
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97 }
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98 }
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99 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org