repicea.stats.sampling

Class SamplingUtility

java.lang.Object

repicea.stats.sampling.SamplingUtility

public class SamplingUtility
extends java.lang.Object

Constructor Summary

Constructors

Constructor and Description
SamplingUtility()

Method Summary

Modifier and Type	Method and Description
static java.util.Map<java.lang.Object,java.lang.Integer>	getObservationFrequencies(java.util.Collection list) This method returns the list of different observations and their frequency.
static java.util.List<?>	getSample(java.util.List<?> population, int sampleSize) This method returns a sample from a population drawn according to a random sample without replacement.
static java.util.List<?>	getSample(java.util.List<?> population, int sampleSize, boolean withReplacement) This method returns a sample from a population.
static java.util.Map	getSample(java.util.Map population, int sampleSize) This method returns a sample from a population drawn without replacement..

Methods inherited from class java.lang.Object

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

Constructor Detail

SamplingUtility

public SamplingUtility()

Method Detail

getSample

public static java.util.List<?> getSample(java.util.List<?> population,
                                          int sampleSize,
                                          boolean withReplacement)

This method returns a sample from a population.

Parameters:

population - a List instance with the population

sampleSize - an integer

withReplacement - true if sampling with replacement or false otherwise

Returns:

a List instance containing the sample

getObservationFrequencies

public static java.util.Map<java.lang.Object,java.lang.Integer> getObservationFrequencies(java.util.Collection list)

This method returns the list of different observations and their frequency.

Parameters:

list - a population or a sample

Returns:

a Map with observation as keys and frequencies as values

getSample

public static java.util.List<?> getSample(java.util.List<?> population,
                                          int sampleSize)

This method returns a sample from a population drawn according to a random sample without replacement. design.

Parameters:

population - a List instance with the population

sampleSize - an integer

Returns:

a List instance containing the sample

getSample

public static java.util.Map getSample(java.util.Map population,
                                      int sampleSize)

This method returns a sample from a population drawn without replacement..

Parameters:

population - a Map instance with the population

sampleSize - an integer

Returns:

a Map instance containing the sample