com.datumbox.framework.core.statistics.sampling

Class SystematicSampling

java.lang.Object

com.datumbox.framework.core.statistics.sampling.SystematicSampling

public class SystematicSampling
extends java.lang.Object

This class provides methods which can be used for performing Systematic Sampling.

Constructor Summary

Constructors

Constructor and Description
SystematicSampling()

Method Summary

Modifier and Type	Method and Description
static double	mean(FlatDataCollection flatDataCollection) Calculate the mean from the sample
static FlatDataCollection	randomSampling(FlatDataList idList, int n, boolean randomizeRecords) Samples n ids by using Systematic Sampling
static double	xbarStd(FlatDataCollection flatDataCollection) Calculates Standard Deviation for Xbar
static double	xbarVariance(FlatDataCollection flatDataCollection) Calculates Variance for Xbar

Methods inherited from class java.lang.Object

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

Constructor Detail

SystematicSampling

public SystematicSampling()

Method Detail

randomSampling

public static FlatDataCollection randomSampling(FlatDataList idList,
                                                int n,
                                                boolean randomizeRecords)

Samples n ids by using Systematic Sampling

Parameters:

idList -

n -

randomizeRecords -

Returns:

mean

public static double mean(FlatDataCollection flatDataCollection)

Calculate the mean from the sample

Parameters:

flatDataCollection -

Returns:

xbarVariance

public static double xbarVariance(FlatDataCollection flatDataCollection)

Calculates Variance for Xbar

Parameters:

flatDataCollection -

Returns:

xbarStd

public static double xbarStd(FlatDataCollection flatDataCollection)

Calculates Standard Deviation for Xbar

Parameters:

flatDataCollection -

Returns: