1 files changed, 90 insertions, 0 deletions
diff --git a/src/de/lmu/ifi/dbs/elki/math/statistics/distribution/estimator/LogisticLMMEstimator.java b/src/de/lmu/ifi/dbs/elki/math/statistics/distribution/estimator/LogisticLMMEstimator.java
new file mode 100644
index 00000000..973a91de
--- /dev/null
+++ b/src/de/lmu/ifi/dbs/elki/math/statistics/distribution/estimator/LogisticLMMEstimator.java
@@ -0,0 +1,90 @@
+package de.lmu.ifi.dbs.elki.math.statistics.distribution.estimator;
+
+/*
+ This file is part of ELKI:
+ Environment for Developing KDD-Applications Supported by Index-Structures
+
+ Copyright (C) 2013
+ Ludwig-Maximilians-Universität München
+ Lehr- und Forschungseinheit für Datenbanksysteme
+ ELKI Development Team
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU Affero General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ GNU Affero General Public License for more details.
+
+ You should have received a copy of the GNU Affero General Public License
+ along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+import de.lmu.ifi.dbs.elki.math.statistics.distribution.LogisticDistribution;
+import de.lmu.ifi.dbs.elki.utilities.documentation.Reference;
+import de.lmu.ifi.dbs.elki.utilities.optionhandling.AbstractParameterizer;
+
+/**
+ * Estimate the parameters of a Logistic Distribution, using the methods of
+ * L-Moments (LMM).
+ * 
+ * Reference:
+ * <p>
+ * J. R. M. Hosking<br />
+ * Fortran routines for use with the method of L-moments Version 3.03<br />
+ * IBM Research.
+ * </p>
+ * 
+ * @author Erich Schubert
+ * 
+ * @apiviz.has LogisticDistribution
+ */
+@Reference(authors = "J.R.M. Hosking", title = "Fortran routines for use with the method of L-moments Version 3.03", booktitle = "IBM Research Technical Report")
+public class LogisticLMMEstimator extends AbstractLMMEstimator<LogisticDistribution> {
+  /**
+   * Static instance.
+   */
+  public static final LogisticLMMEstimator STATIC = new LogisticLMMEstimator();
+
+  /**
+   * Constructor. Private: use static instance.
+   */
+  private LogisticLMMEstimator() {
+    super();
+  }
+
+  @Override
+  public int getNumMoments() {
+    return 2;
+  }
+
+  @Override
+  public LogisticDistribution estimateFromLMoments(double[] xmom) {
+    // The original publication would also estimate a shape, but we don't have
+    // the generalized logistic distribution yet.
+    // So we continue as if the Type II shape is 0, fairly trivial:
+    return new LogisticDistribution(xmom[0], xmom[1]);
+  }
+
+  @Override
+  public Class<? super LogisticDistribution> getDistributionClass() {
+    return LogisticDistribution.class;
+  }
+
+  /**
+   * Parameterization class.
+   * 
+   * @author Erich Schubert
+   * 
+   * @apiviz.exclude
+   */
+  public static class Parameterizer extends AbstractParameterizer {
+    @Override
+    protected LogisticLMMEstimator makeInstance() {
+      return STATIC;
+    }
+  }
+}