org.apache.spark.partial

Class StudentTCacher

Object

org.apache.spark.partial.StudentTCacher

public class StudentTCacher
extends Object

A utility class for caching Student's T distribution values for a given confidence level and various sample sizes. This is used by the MeanEvaluator to efficiently calculate confidence intervals for many keys.

Constructor Summary

Constructors

Constructor and Description
StudentTCacher(double confidence)

Method Summary

Methods

Modifier and Type	Method and Description
double[]	cache()
double	get(long sampleSize)
int	NORMAL_APPROX_SAMPLE_SIZE()
double	normalApprox()

Methods inherited from class Object

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

Constructor Detail

StudentTCacher

public StudentTCacher(double confidence)

Method Detail

NORMAL_APPROX_SAMPLE_SIZE

public int NORMAL_APPROX_SAMPLE_SIZE()

normalApprox

public double normalApprox()

cache

public double[] cache()

get

public double get(long sampleSize)