Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/math/StdDevOutlier.java @ 5645:696d710470f5

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flys/issue1077: Show loads as step line, therefore transform data in SedimentLoadFacet to stretch as in the measurement stations bounds. Deal with this new kind of data in the Generator.
author Felix Wolfsteller <felix.wolfsteller@intevation.de>
date Wed, 10 Apr 2013 09:35:07 +0200
parents 846b0441f905
children
rev   line source
4794
a7d080347ac3 MINFO: Allow two methods for outlier test in SQ relation.
Raimund Renkert <rrenkert@intevation.de>
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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.stat.descriptive.moment.StandardDeviation;
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6
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7 import org.apache.log4j.Logger;
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8
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9 public class StdDevOutlier
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10 {
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11 public static final double DEFAULT_FACTOR = 3;
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12
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13 private static Logger log = Logger.getLogger(StdDevOutlier.class);
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14
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15 protected StdDevOutlier() {
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16 }
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17
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18 public static Integer findOutlier(List<Double> values) {
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19 return findOutlier(values, DEFAULT_FACTOR, null);
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20 }
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21
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8ee270a3ef25 Small code cleanups in S/Q outlier tests.
Sascha L. Teichmann <teichmann@intevation.de>
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22 public static Integer findOutlier(
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23 List<Double> values,
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846b0441f905 Removed trailing whitespace.
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24 double factor,
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25 double [] stdDevResult
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26 ) {
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27 boolean debug = log.isDebugEnabled();
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28
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29 if (debug) {
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30 log.debug("factor for std dev: " + factor);
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31 }
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32
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33 int N = values.size();
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34
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35 if (debug) {
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36 log.debug("Values to check: " + N);
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37 }
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38
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39 if (N < 3) {
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40 return null;
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41 }
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42
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43 StandardDeviation stdDev = new StandardDeviation();
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44
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45 double maxValue = -Double.MAX_VALUE;
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46 int maxIndex = -1;
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47 for (int i = N-1; i >= 0; --i) {
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48 double value = Math.abs(values.get(i));
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49 stdDev.increment(value);
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50 if (value > maxValue) {
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51 maxValue = value;
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52 maxIndex = i;
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53 }
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54 }
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55
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56 double sd = stdDev.getResult();
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57
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58 double accepted = factor * sd;
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59
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60 if (debug) {
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61 log.debug("std dev: " + stdDev);
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62 log.debug("accepted: " + accepted);
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63 log.debug("max value: " + maxValue);
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64 }
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65
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66 if (stdDevResult != null) {
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67 stdDevResult[0] = sd;
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68 }
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69
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70 return maxValue > accepted ? maxIndex : null;
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71 }
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72 }
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73 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org