edu.umass.cs.mallet.base.util

Class VectorStats

java.lang.Object

edu.umass.cs.mallet.base.util.VectorStats

public class VectorStats
extends Object

Constructor Summary

Constructors

Constructor and Description
VectorStats()

Method Summary

Modifier and Type	Method and Description
static SparseVector	mean(InstanceList instances) Returns a SparseVector whose entries (taken from the union of those in the instances) are the expected values of those in the InstanceList.
static SparseVector	mean(InstanceList instances, int numIndices) Returns a SparseVector whose entries (dense with the given number of indices) are the expected values of those in the InstanceList.
static SparseVector	mean(InstanceList instances, int[] indices) Returns a SparseVector whose entries (the given indices) are the expected values of those in the InstanceList.
static SparseVector	stddev(InstanceList instances) Square root of unbiased variance.
static SparseVector	stddev(InstanceList instances, boolean unbiased) Square root of variance.
static SparseVector	stddev(InstanceList instances, SparseVector mean) Square root of unbiased variance of instances having the given mean
static SparseVector	stddev(InstanceList instances, SparseVector mean, boolean unbiased) Square root of variance.
static SparseVector	variance(InstanceList instances) Returns unbiased variance
static SparseVector	variance(InstanceList instances, boolean unbiased) Returns a SparseVector whose entries (taken from the union of those in the instances) are the variance of those in the InstanceList.
static SparseVector	variance(InstanceList instances, SparseVector mean) Returns unbiased variance of instances having the given mean.
static SparseVector	variance(InstanceList instances, SparseVector mean, boolean unbiased) Returns a SparseVector whose entries (taken from the mean argument) are the variance of those in the InstanceList.

Methods inherited from class java.lang.Object

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

Constructor Detail

VectorStats

public VectorStats()

Method Detail

mean

public static SparseVector mean(InstanceList instances)

Returns a SparseVector whose entries (taken from the union of those in the instances) are the expected values of those in the InstanceList. This implies the returned vector will not have binary values.

mean

public static SparseVector mean(InstanceList instances,
                                int numIndices)

Returns a SparseVector whose entries (dense with the given number of indices) are the expected values of those in the InstanceList. This implies the returned vector will not have binary values.

mean

public static SparseVector mean(InstanceList instances,
                                int[] indices)

Returns a SparseVector whose entries (the given indices) are the expected values of those in the InstanceList. This implies the returned vector will not have binary values.

variance

public static SparseVector variance(InstanceList instances,
                                    boolean unbiased)

Returns a SparseVector whose entries (taken from the union of those in the instances) are the variance of those in the InstanceList. This implies the returned vector will not have binary values.

Parameters:

unbiased - Normalizes by N-1 when true, and by N otherwise.

variance

public static SparseVector variance(InstanceList instances,
                                    SparseVector mean,
                                    boolean unbiased)

Returns a SparseVector whose entries (taken from the mean argument) are the variance of those in the InstanceList. This implies the returned vector will not have binary values.

Parameters:

unbiased - Normalizes by N-1 when true, and by N otherwise.

variance

public static SparseVector variance(InstanceList instances)

Returns unbiased variance

variance

public static SparseVector variance(InstanceList instances,
                                    SparseVector mean)

Returns unbiased variance of instances having the given mean.

stddev

public static SparseVector stddev(InstanceList instances,
                                  SparseVector mean,
                                  boolean unbiased)

Square root of variance.

Parameters:

mean - Mean of the given instances.

unbiased - Normalizes variance by N-1 when true, and by N otherwise.

See Also:

variance

stddev

public static SparseVector stddev(InstanceList instances)

Square root of unbiased variance.

stddev

public static SparseVector stddev(InstanceList instances,
                                  boolean unbiased)

Square root of variance.

Parameters:

unbiased - Normalizes variance by N-1 when true, and by N otherwise.

See Also:

variance

stddev

public static SparseVector stddev(InstanceList instances,
                                  SparseVector mean)

Square root of unbiased variance of instances having the given mean