Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/math/StdDevOutlier.java @ 5622:b28a6d05e969

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Add a new mechanism in mapfish print call to add arbitary data maps Data properties are identified by starting with mapfish-data and they are then split in info value pairs where info can be the description of the information and value the value of the information to be transported in the data map.
author Andre Heinecke <aheinecke@intevation.de>
date Tue, 09 Apr 2013 19:04:32 +0200
parents 846b0441f905
children
rev   line source
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a7d080347ac3 MINFO: Allow two methods for outlier test in SQ relation.
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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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22 public static Integer findOutlier(
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23 List<Double> values,
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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