Overview | Package | Class | Use | Tree | Deprecated | Index | Help
PREV CLASS NEXT CLASS | FRAMES NO FRAMES
SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD

## de.jstacs.utils
Class StatisticalTest

    java.lang.Object
      de.jstacs.utils.StatisticalTest

    public class StatisticalTest

extends Object

This class enables the user to compute some divergences. In Latex notation the divergence is

`Y_{\epsilon}(p,q) = \frac{\left[\sum_{i,j} p_{i,j} \cdot \left(\frac{p_{i,j}}{q_{i,j}}\right)^{\epsilon-1}\right] - 1}{\frac{\epsilon(\epsilon-1)}{2}}`

NOTE: There is no checking if the user given matrices and vectors are stochastic.

Author:
  Jens Keilwagen

Constructor Summary
`StatisticalTest()`

Method Summary
`static double` | `getGeneralizedDivergence(double[][] p, double epsilon)` Computes the generalized divergence for two stochastic matrices over the same domain, i.e. the matrices have to have the same dimensionality.
`static double` | `getGeneralizedDivergence(double[][] p, double[][] q, double epsilon)` Computes the generalized divergence for two given stochastic matrices over the same domain, i.e. the matrices have to have the same dimensionality.
`static double` | `getGeneralizedDivergence(double[][] p, double[] r, double[] s, double epsilon)` Computes the generalized divergence for two stochastic matrices over the same domain, i.e. the matrices have to have the same dimensionality.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### StatisticalTest

    public StatisticalTest()

Method Detail

### getGeneralizedDivergence

    public static double getGeneralizedDivergence(double[][] p,
                                                  double[][] q,
                                                  double epsilon)
                                           throws IllegalArgumentException

  Computes the generalized divergence for two given stochastic matrices over the same domain, i.e. the matrices have to have the same dimensionality.
  For `epsilon=1` this method returns 2*(mutual information).

  Parameters:
    `p` - one stochastic matrix
    `q` - another stochastic matrix
    `epsilon` - the positive divergence parameter
  Returns:
    the value of the generalized divergence for the two matrices
  Throws:
    `IllegalArgumentException` - if some arguments are not correct

### getGeneralizedDivergence

    public static double getGeneralizedDivergence(double[][] p,
                                                  double[] r,
                                                  double[] s,
                                                  double epsilon)

  Computes the generalized divergence for two stochastic matrices over the same domain, i.e. the matrices have to have the same dimensionality. The second matrix is computed as joint probability of the given stochastic vectors.
  For `epsilon=1` this method returns 2*(mutual information).

  Parameters:
    `p` - a stochastic matrix
    `r` - one stochastic vector
    `s` - another stochastic vector
    `epsilon` - the divergence parameter
  Returns:
    the value of the generalized divergence for two stochastic matrices

### getGeneralizedDivergence

    public static double getGeneralizedDivergence(double[][] p,
                                                  double epsilon)

  Computes the generalized divergence for two stochastic matrices over the same domain, i.e. the matrices have to have the same dimensionality. The second matrix is computed as joint probability of the marginal distributions.
  For `epsilon=1` this method returns 2*(mutual information).

  Parameters:
    `p` - a stochastic matrix
    `epsilon` - the divergence parameter
  Returns:
    the value of the generalized divergence for two stochastic matrices

Overview | Package | Class | Use | Tree | Deprecated | Index | Help
PREV CLASS NEXT CLASS | FRAMES NO FRAMES
SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD