Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/math/Outlier.java @ 4488:5041105d2edd

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Check if response code from GGInA is 200 OK Only parse the GGInA response if the status code is 200 OK. This improves the error message if GGInA is not available and shows the real reason instead of a JDOM error while parsing the response.
author Björn Ricks <bjoern.ricks@intevation.de>
date Wed, 14 Nov 2012 10:36:21 +0100
parents b136113dad53
children
rev   line source
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4f7d1ea38404 Added simple Grubb's outlier test.
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parents:
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1 package de.intevation.flys.artifacts.math;
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2
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3 import java.util.List;
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4
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5 import org.apache.commons.math.MathException;
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6
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7 import org.apache.commons.math.distribution.TDistributionImpl;
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8
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9 import org.apache.commons.math.stat.descriptive.moment.Mean;
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10 import org.apache.commons.math.stat.descriptive.moment.StandardDeviation;
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12 import org.apache.log4j.Logger;
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13
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14 public class Outlier
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15 {
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16 public static final double EPSILON = 1e-5;
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17
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18 public static final double DEFAULT_ALPHA = 0.05;
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19
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20 private static Logger log = Logger.getLogger(Outlier.class);
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22 protected Outlier() {
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23 }
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25 public static Integer findOutlier(List<Double> values) {
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26 return findOutlier(values, DEFAULT_ALPHA);
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27 }
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29 public static Integer findOutlier(List<Double> values, double alpha) {
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30 boolean debug = log.isDebugEnabled();
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31
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32 if (debug) {
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33 log.debug("outliers significance: " + alpha);
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34 }
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35
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36 alpha = 1d - alpha;
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37
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38 int N = values.size();
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39
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40 if (debug) {
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41 log.debug("Values to check: " + N);
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42 }
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43
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44 if (N < 3) {
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45 return null;
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parents: 3564
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46 }
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47
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48 Mean mean = new Mean();
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49 StandardDeviation std = new StandardDeviation();
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50
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51 for (Double value: values) {
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52 double v = value.doubleValue();
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53 mean.increment(v);
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54 std .increment(v);
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55 }
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56
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57 double m = mean.getResult();
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58 double s = std.getResult();
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59
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60 if (debug) {
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61 log.debug("mean: " + m);
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62 log.debug("std dev: " + s);
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63 }
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64
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65 double maxZ = -Double.MAX_VALUE;
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66 int iv = -1;
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67 for (int i = N-1; i >= 0; --i) {
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68 double v = values.get(i).doubleValue();
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69 double z = Math.abs(v - m);
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70 if (z > maxZ) {
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71 maxZ = z;
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72 iv = i;
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73 }
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74 }
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75
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76 if (Math.abs(s) < EPSILON) {
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77 return null;
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parents: 3564
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78 }
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79
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80 maxZ /= s;
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81
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82 TDistributionImpl tdist = new TDistributionImpl(N-2);
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83
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84 double t;
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85
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86 try {
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87 t = tdist.inverseCumulativeProbability(alpha/(N+N));
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88 }
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89 catch (MathException me) {
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90 log.error(me);
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91 return null;
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parents: 3564
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92 }
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93
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94 t *= t;
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95
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96 double za = ((N-1)/Math.sqrt(N))*Math.sqrt(t/(N-2d+t));
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97
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98 if (debug) {
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99 log.debug("max: " + maxZ + " crit: " + za);
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100 }
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101
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102 return maxZ > za
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103 ? Integer.valueOf(iv)
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104 : null;
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105 }
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106 }
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107 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org