/**
* Copyright (C) 2009 - present by OpenGamma Inc. and the OpenGamma group of companies
*
* Please see distribution for license.
*/
package com.opengamma.analytics.math.statistics.estimation;
import org.apache.commons.lang.Validate;
import com.opengamma.analytics.math.function.Function1D;
import com.opengamma.analytics.math.statistics.descriptive.MeanCalculator;
import com.opengamma.analytics.math.statistics.descriptive.PopulationStandardDeviationCalculator;
import com.opengamma.analytics.math.statistics.distribution.NormalDistribution;
import com.opengamma.analytics.math.statistics.distribution.ProbabilityDistribution;
import com.opengamma.util.ArgumentChecker;
/**
*
*/
public class NormalDistributionMaximumLikelihoodEstimator extends DistributionParameterEstimator<Double> {
// TODO add error estimates
private final Function1D<double[], Double> _mean = new MeanCalculator();
private final Function1D<double[], Double> _std = new PopulationStandardDeviationCalculator();
@Override
public ProbabilityDistribution<Double> evaluate(final double[] x) {
Validate.notNull(x, "x");
ArgumentChecker.notEmpty(x, "x");
return new NormalDistribution(_mean.evaluate(x), _std.evaluate(x));
}
}