com.itemanalysis.psychometrics.histogram

Class FreedmanDiaconisBinCalculation

java.lang.Object

com.itemanalysis.psychometrics.histogram.FreedmanDiaconisBinCalculation

All Implemented Interfaces:

BinCalculation

public class FreedmanDiaconisBinCalculation
extends java.lang.Object
implements BinCalculation

The Freedman-Diaconis method fro computing the number of bins. Unlike the other bin calculations, this class is not storeless because it must store the array of data points to compute percentiles.

Author:

J. Patrick Meyer

Constructor Summary

Constructors

Constructor and Description
FreedmanDiaconisBinCalculation(double n, double min, double max, double q1, double q3) Create the Freedman-Diaconis class fro computing the number of bins.

Method Summary

Modifier and Type	Method and Description
double	binWidth() Gets the width of the bins according to the number of bins being used.
BinCalculationType	getType()
int	numberOfBins() Gets the number of bins calculated by the Freedman-Diaconis method.

Methods inherited from class java.lang.Object

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

Constructor Detail

FreedmanDiaconisBinCalculation

public FreedmanDiaconisBinCalculation(double n,
                                      double min,
                                      double max,
                                      double q1,
                                      double q3)

Create the Freedman-Diaconis class fro computing the number of bins.

Method Detail

numberOfBins

public int numberOfBins()

Gets the number of bins calculated by the Freedman-Diaconis method.

Specified by:

numberOfBins in interface BinCalculation

Returns:

number of histogram bins.

binWidth

public double binWidth()

Gets the width of the bins according to the number of bins being used.

Specified by:

binWidth in interface BinCalculation

Returns:

bin width.

getType

public BinCalculationType getType()

Specified by:

getType in interface BinCalculation