com.numericalmethod.suanshu.stats.timeseries.linear.univariate.sample
Class AutoCorrelation

java.lang.Object
  com.numericalmethod.suanshu.analysis.function.rn2r1.BivariateRealFunction
      com.numericalmethod.suanshu.stats.timeseries.linear.univariate.AutoCorrelationFunction
          com.numericalmethod.suanshu.stats.timeseries.linear.univariate.sample.AutoCorrelation

All Implemented Interfaces:

Function, RealScalarFunction

public class AutoCorrelation
extends AutoCorrelationFunction

This computes the sample Auto-Correlation Function (ACF) for a univariate data set.

See Also:

"William W.S. Wei, "Section 2.5.3. Sample Auto-correlation function" in Time Series Analysis : Univariate and Multivariate Methods (2nd Edition), Addison Wesley; 2 edition (July 17, 2005)"

Nested Class Summary

Nested classes/interfaces inherited from interface com.numericalmethod.suanshu.analysis.function.Function

Function.EvaluationException

Constructor Summary

AutoCorrelation(TimeSeries xt)

AutoCorrelation(TimeSeries xt, AutoCovariance.Type type)

Method Summary

double	evaluate(double x1, double x2) Compute f(x1, x2).
double	evaluate(int k) Compute the auto-correlation for lag k.

Methods inherited from class com.numericalmethod.suanshu.stats.timeseries.linear.univariate.AutoCorrelationFunction

get

Methods inherited from class com.numericalmethod.suanshu.analysis.function.rn2r1.BivariateRealFunction

dimension4Domain, dimension4Range, evaluate

Methods inherited from class java.lang.Object

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

Constructor Detail

AutoCorrelation

public AutoCorrelation(TimeSeries xt,
                       AutoCovariance.Type type)

AutoCorrelation

public AutoCorrelation(TimeSeries xt)

Method Detail

evaluate

public double evaluate(int k)

Compute the auto-correlation for lag k.

Parameters:

k - lag

Returns:

ρ(k)

evaluate

public double evaluate(double x1,
                       double x2)

Description copied from class: BivariateRealFunction

Compute f(x1, x2).

Specified by:

evaluate in class BivariateRealFunction

Parameters:

x1 - x1

x2 - x2

Returns:

f(x1, x2)