Package org.apache.sysds.runtime.compress.estim.sample

Class SmoothedJackknifeEstimator

java.lang.Object

org.apache.sysds.runtime.compress.estim.sample.SmoothedJackknifeEstimator

public class SmoothedJackknifeEstimator
extends Object

Constructor Summary

Constructors

Constructor	Description
SmoothedJackknifeEstimator()

Method Summary

Modifier and Type	Method	Description
static int	distinctCount(int numVals, int[] freqCounts, int nRows, int sampleSize)	Peter J.

Methods inherited from class java.lang.Object

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

Constructor Detail

SmoothedJackknifeEstimator

public SmoothedJackknifeEstimator()

Method Detail

distinctCount

public static int distinctCount(int numVals,
                                int[] freqCounts,
                                int nRows,
                                int sampleSize)

Peter J. Haas, Jeffrey F. Naughton, S. Seshadri, and Lynne Stokes. Sampling-Based Estimation of the Number of Distinct Values of an Attribute. VLDB'95, Section 4.3.

Parameters:

numVals - The number of unique values in the sample

freqCounts - The inverse histogram of frequencies. counts extracted

nRows - The original number of rows in the entire input

sampleSize - The number of rows in the sample

Returns:

Estimate of the number of distinct values