Package math

Class Regress

java.lang.Object

math.Regress

public class Regress
extends java.lang.Object

Class Regress estimates a regression coefficient.

Instances of class Regress are not thread-safe, but concurrent updates are permitted, and invocation of the beta() method in the absence of concurrent updates returns an accurate result.

Constructor Summary

Constructors

Constructor	Description
Regress()	Constructs a new Regress instance.

Method Summary

Modifier and Type	Method	Description
void	add(double x, double y)	Records the specified values of the dependent and independent variables.
double	beta()	Returns the regression coefficient for the recorded values of the independent and dependent variables.
long	cnt()	Returns the number of recorded values of the independent variable.
static void	main(java.lang.String[] args)

Methods inherited from class java.lang.Object

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

Constructor Detail

Regress

public Regress()

Constructs a new Regress instance.

Method Detail

add

public void add(double x,
                double y)

Records the specified values of the dependent and independent variables.

Parameters:

x - the value of the independent variable

y - the value of the dependent variable

cnt

public long cnt()

Returns the number of recorded values of the independent variable. The returned value is NOT an atomic snapshot. An accurate result is guaranteed only if no concurrent updates occur during method invocation.

Returns:

the number of recorded values of the independent variable

beta

public double beta()

Returns the regression coefficient for the recorded values of the independent and dependent variables. The returned value is NOT an atomic snapshot. An accurate result is guaranteed only if no concurrent updates occur during method invocation.

Returns:

the regression coefficient for the recorded values of the independent and dependent variables

main

public static void main(java.lang.String[] args)