util.gen
Class LinearRegression

java.lang.Object
  util.gen.LinearRegression

public class LinearRegression

extends java.lang.Object

For calculating a simple linear regression. Adapted from http://www-stat.stanford.edu/~naras/java/course/lec2/ Balasubramanian Narasimhan, Stanford

Constructor Summary

LinearRegression(double[] x, double[] y)

Method Summary

double	calculateX(double y) Calculate X given Y.
double	calculateY(double x) Calculate Y given X.
double	getIntercept()
java.lang.String	getModel() Returns Y=mX+b with full precision, no rounding of numbers.
java.lang.String	getRoundedModel() Returns Y=mX+b
double	getRSquared()
double	getSlope()
double[]	getX()
static double	interpolateX(double x1, double y1, double x2, double y2, double fixedY) Return approximated X value, good for a single interpolation, multiple calls are inefficient!
static double	interpolateY(double x1, double y1, double x2, double y2, double fixedX) Return approximated Y value, good for a single interpolation, multiple calls are inefficient!
static void	main(java.lang.String[] args) An example.
void	nullArrays() Nulls the x and y arrays.

Methods inherited from class java.lang.Object

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

Constructor Detail

LinearRegression

public LinearRegression(double[] x,
                        double[] y)

Method Detail

main

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

An example.

interpolateY

public static double interpolateY(double x1,
                                  double y1,
                                  double x2,
                                  double y2,
                                  double fixedX)

Return approximated Y value, good for a single interpolation, multiple calls are inefficient!

interpolateX

public static double interpolateX(double x1,
                                  double y1,
                                  double x2,
                                  double y2,
                                  double fixedY)

Return approximated X value, good for a single interpolation, multiple calls are inefficient!

getSlope

public double getSlope()

getIntercept

public double getIntercept()

getRSquared

public double getRSquared()

getX

public double[] getX()

getModel

public java.lang.String getModel()

Returns Y=mX+b with full precision, no rounding of numbers.

getRoundedModel

public java.lang.String getRoundedModel()

Returns Y=mX+b

calculateY

public double calculateY(double x)

Calculate Y given X.

calculateX

public double calculateX(double y)

Calculate X given Y.

nullArrays

public void nullArrays()

Nulls the x and y arrays. Good to call before saving.