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

Interface HassAndStokes

public interface HassAndStokes

Nested Class Summary

Nested Classes

Modifier and Type	Interface	Description
static class	HassAndStokes.MethodOfMomentsFunction

Field Summary

Fields

Modifier and Type	Field	Description
static final double	HAAS_AND_STOKES_ALPHA1
static final double	HAAS_AND_STOKES_ALPHA2
static final int	HAAS_AND_STOKES_UJ2A_C
static final boolean	HAAS_AND_STOKES_UJ2A_CUT2
static final boolean	HAAS_AND_STOKES_UJ2A_SOLVE
static final int	MAX_SOLVE_CACHE_SIZE

Method Summary

Static Methods

Modifier and Type	Method	Description
static int	distinctCount(int numVals, int[] freqCounts, int nRows, int sampleSize, HashMap<Integer,Double> solveCache)	Haas, Peter J., and Lynne Stokes.

Field Details

HAAS_AND_STOKES_ALPHA1

static final double HAAS_AND_STOKES_ALPHA1

See Also:

• Constant Field Values

HAAS_AND_STOKES_ALPHA2

static final double HAAS_AND_STOKES_ALPHA2

See Also:

• Constant Field Values

HAAS_AND_STOKES_UJ2A_C

static final int HAAS_AND_STOKES_UJ2A_C

See Also:

• Constant Field Values

HAAS_AND_STOKES_UJ2A_CUT2

static final boolean HAAS_AND_STOKES_UJ2A_CUT2

See Also:

• Constant Field Values

HAAS_AND_STOKES_UJ2A_SOLVE

static final boolean HAAS_AND_STOKES_UJ2A_SOLVE

See Also:

• Constant Field Values

MAX_SOLVE_CACHE_SIZE

static final int MAX_SOLVE_CACHE_SIZE

See Also:

• Constant Field Values

Method Details

distinctCount

static int distinctCount(int numVals,
 int[] freqCounts,
 int nRows,
 int sampleSize,
 HashMap<Integer,Double> solveCache)

Haas, Peter J., and Lynne Stokes. "Estimating the number of classes in a finite population." Journal of the American Statistical Association 93.444 (1998): 1475-1487. The hybrid estimator given by Eq. 33 in Section 6

Parameters:

numVals - The number of unique values in the sample

freqCounts - The inverse histogram of frequencies. counts extracted

nRows - The number of rows originally in the input

sampleSize - The number of rows used in the sample

solveCache - A Hashmap containing information for getDuj2aEstimate

Returns:

An estimation of distinct elements in the population.