Mercurial > dive4elements > river
view flys-artifacts/src/main/java/de/intevation/flys/artifacts/model/sq/Outlier.java @ 4241:49cb65d5932d
Improved the historical discharge calculation.
The calculation now creates new HistoricalWQKms (new subclass of WQKms). Those WQKms are used
to create new facets from (new) type 'HistoricalDischargeCurveFacet'. The chart generator is
improved to support those facets.
author | Ingo Weinzierl <ingo.weinzierl@intevation.de> |
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date | Wed, 24 Oct 2012 14:34:35 +0200 |
parents | b8b1280606c2 |
children | a7d080347ac3 |
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package de.intevation.flys.artifacts.model.sq; import java.util.ArrayList; import java.util.List; import org.apache.commons.math.MathException; import org.apache.commons.math.stat.descriptive.moment.StandardDeviation; import org.apache.log4j.Logger; public class Outlier { private static Logger log = Logger.getLogger(Outlier.class); public interface Callback { void initialize(List<SQ> sqs) throws MathException; double eval(SQ sq); void iterationFinished( double stdDev, SQ outlier, List<SQ> remaining); } // interface Callback public static void detectOutliers( Callback callback, List<SQ> sqs, double stdDevFactor ) throws MathException { boolean debug = log.isDebugEnabled(); if (debug) { log.debug("stdDevFactor: " + stdDevFactor); } List<SQ> data = new ArrayList<SQ>(sqs); while (data.size() > 2) { callback.initialize(data); StandardDeviation stdDev = new StandardDeviation(); double maxValue = -Double.MAX_VALUE; int maxIndex = -1; for (int i = data.size()-1; i >= 0; --i) { double value = Math.abs(callback.eval(data.get(i))); stdDev.increment(value); if (value > maxValue) { maxValue = value; maxIndex = i; } } double sd = stdDev.getResult(); double accepted = stdDevFactor * sd; if (debug) { log.debug("std dev: " + stdDev); log.debug("accepted: " + accepted); log.debug("max value: " + maxValue); } SQ outlier = maxValue > accepted ? data.remove(maxIndex) : null; callback.iterationFinished(sd, outlier, data); if (outlier == null) { break; } } } } // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :