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annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/math/StdDevOutlier.java @ 5818:a4ff4167be1e

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Request feature info on all layers and show it as html if the server does not return valid gml. Non queryable layers produce an error message when the request fails. This is good enough
author Andre Heinecke <aheinecke@intevation.de>
date Wed, 24 Apr 2013 17:33:27 +0200
parents 846b0441f905
children
rev   line source
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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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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