Package qa.generator.distributions

Class QACorrelatedSequence

java.lang.Object

qa.generator.distributions.QADistribution

qa.generator.distributions.QACorrelatedSequence

public class QACorrelatedSequence
extends QADistribution

Make a correlated sequence of values with a given width and mean.

This can be used to generate slowly varying amplitude and ICI sequences. Works by generating the numbers from a base distribution and then filtering them at a frequency of 1/correlation using a 'correlation' order butterworth filter.

Author:

dg50

Constructor Summary

Constructors

Constructor	Description
QACorrelatedSequence(boolean integrate, double mean, double width, int correlation)	Construct a correlated sequence of values with given mean and distribution width using a gamma distribution.
QACorrelatedSequence(boolean integrate, QADistribution baseDistribution, double mean, double width, int correlation)	Construct a correlated sequence of values with given mean and distribution width using a gamma distribution.

Method Summary

Modifier and Type	Method	Description
protected double[]	createValues(int nValues)	Generate a set of random values according to the underlying distribution.
double[]	getRange(double nSigma)	Get the range of the distrubution.

Methods inherited from class qa.generator.distributions.QADistribution

getRange, getValues, isIntegrate, isSort, setIntegrate, setSort

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

QACorrelatedSequence

public QACorrelatedSequence(boolean integrate,
 QADistribution baseDistribution,
 double mean,
 double width,
 int correlation)

Construct a correlated sequence of values with given mean and distribution width using a gamma distribution.

Parameters:

integrate - integrate the values (e.g. to give times rather than inter-click intervals)

baseDistribution - underlying distribution. This will probably need to be set up with a width (e.g. the Guassian sigma) of sqrt(correlation) times the width you want in the distribution of the output data.

mean - mean value

width - width of distribution

correlation - order of the correlation

QACorrelatedSequence

public QACorrelatedSequence(boolean integrate,
 double mean,
 double width,
 int correlation)

Construct a correlated sequence of values with given mean and distribution width using a gamma distribution.

Parameters:

integrate - integrate the values (e.g. to give times rather than inter-click intervals)

mean - mean value

width - width of distribution

correlation - order of the correlation

Method Details

createValues

protected double[] createValues(int nValues)

Description copied from class: QADistribution

Generate a set of random values according to the underlying distribution.

Do not sort or integrate within createValues, that wil be handled by the calling getValues function

Specified by:

createValues in class QADistribution

Parameters:

nValues - number of values to generate.

Returns:

array of values.

getRange

public double[] getRange(double nSigma)

Description copied from class: QADistribution

Get the range of the distrubution. How this is defined is a little nebulous, for Guassian like distributions its the mean +/- n standard deviations.

Specified by:

getRange in class QADistribution

Parameters:

nSigma - number of Standard Deviations (or equivalents).

Returns:

The range of values.