/// <summary>
/// Gets the Likelihood Ratio between two models.
/// </summary>
/// <remarks>
/// The deviance is defined as -2*Log-Likelihood.
/// </remarks>
/// <param name="input">A set of input data.</param>
/// <param name="output">A set of output data.</param>
/// <param name="regression">Another Logistic Regression model.</param>
/// <returns>The Log-Likelihood ratio (a measure of performance
/// between two models) calculated over the given data sets.</returns>
public double GetLogLikelihoodRatio(double[][] input, double[] output, LogisticRegression regression)
{
return(2.0 * (this.GetLogLikelihood(input, output) - regression.GetLogLikelihood(input, output)));
}