Statistics

java.lang.Object
- Core.Tools.Statistics

public class Statistics
extends java.lang.Object

Constructor Summary

Constructors
Constructor and Description

Statistics()

Constructors
Constructor and Description
`Statistics()`

Method Summary

Methods
Modifier and Type	Method and Description
`static void`	`analyse(double[] v)` Prints the means and standard deviation of the data to the standard output.
`static void`	`analyse(double[] v, java.io.PrintStream s)` Prints the means and standard deviation of the data to the specified PrintStream
`static java.lang.String`	`analysisString(double[] v)`
`static double`	`correlation(double[] v1, double[] v2)`
`static double`	`correlation2(double[] v1, double[] v2)`
`static double`	`covar(double[] v1, double[] v2)` Returns the covariance of the paired arrays of double.
`static double`	`max(double[] v)` Returns the maximum value in the array.
`static double`	`mean(double[] v)` Returns the average of an array of double.
`static double`	`mean(int[] v)`
`static double`	`min(double[] v)` Returns the minimum value in the array.
`static java.lang.String`	`rmsString(double[] v)` Returns a string that compares the root mean square of the data with the standard deviation of the data.
`static double`	`sdev(double[] v)` Returns the sample standard deviation of an array of double.
`static double`	`sqr(double x)` Calculates the square of a double.
`static double`	`stderr(double[] v)` Returns the standard error of an array of double, where this is defined as the standard deviation of the sample divided by the square root of the sample size.
`static double[]`	`v2a(java.util.Vector v)` Converts a vector of Numbers into an array of double.
`static double`	`variance(double[] v)` Returns the variance of the array of double.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - Statistics
```
public Statistics()
```
- Method Detail
  - v2a
```
public static double[] v2a(java.util.Vector v)
```
    Converts a vector of Numbers into an array of double. This function does not necessarily belong here, but is commonly required in order to apply the statistical functions conveniently, since they only deal with arrays of double. (Note that a Number of the common superclass of all the Object versions of the primitives, such as Integer, Double etc.).
  - sqr
```
public static double sqr(double x)
```
    Calculates the square of a double.
    
    Returns:
    Returns x*x
  - mean
```
public static double mean(double[] v)
```
    Returns the average of an array of double.
  - mean
```
public static double mean(int[] v)
```
    Parameters:
    v - - sample
    
    Returns:
    the average of an array of int.
  - sdev
```
public static double sdev(double[] v)
```
    Returns the sample standard deviation of an array of double.
  - stderr
```
public static double stderr(double[] v)
```
    Returns the standard error of an array of double, where this is defined as the standard deviation of the sample divided by the square root of the sample size.
  - variance
```
public static double variance(double[] v)
```
    Returns the variance of the array of double.
  - covar
```
public static double covar(double[] v1,
           double[] v2)
```
    Returns the covariance of the paired arrays of double.
  - correlation
```
public static double correlation(double[] v1,
                 double[] v2)
```
  - correlation2
```
public static double correlation2(double[] v1,
                  double[] v2)
```
  - max
```
public static double max(double[] v)
```
    Returns the maximum value in the array.
  - min
```
public static double min(double[] v)
```
    Returns the minimum value in the array.
  - analyse
```
public static void analyse(double[] v)
```
    Prints the means and standard deviation of the data to the standard output.
  - analyse
```
public static void analyse(double[] v,
           java.io.PrintStream s)
```
    Prints the means and standard deviation of the data to the specified PrintStream
    
    Parameters:
    v - contains the data
    s - is the corresponding PrintStream
  - analysisString
```
public static java.lang.String analysisString(double[] v)
```
    Parameters:
    v - contains the data
    
    Returns:
    A String summary of the with the mean and standard deviation of the data.
  - rmsString
```
public static java.lang.String rmsString(double[] v)
```
    Returns a string that compares the root mean square of the data with the standard deviation of the data. This is probably too specialised to be of much general use.
    
    Parameters:
    v - contains the data
    
    Returns:
    root mean square = <...> standard deviation = <...>

Class Statistics

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

Statistics

Method Detail

v2a

sqr

mean

mean

sdev

stderr

variance

covar

correlation

correlation2

max

min

analyse

analyse

analysisString

rmsString