Libraries.Compute.Statistics.Distributions.NumberDistribution Documentation

This is a parent class of distributions that use real numbers as part of their distribution. It contains some default actions to assist in calculating probabilities and distributions. This is adapted from Apache Commons and NIST: https://www.itl.nist.gov/div898/handbook/eda/section3/eda362.htm

Inherits from: Libraries.Language.Object

Actions Documentation

Compare(Libraries.Language.Object object)

This action compares two object hash codes and returns an integer. The result is larger if this hash code is larger than the object passed as a parameter, smaller, or equal. In this case, -1 means smaller, 0 means equal, and 1 means larger. This action was changed in Quorum 7 to return an integer, instead of a CompareResult object, because the previous implementation was causing efficiency issues.

Parameters

Return

integer: The Compare result, Smaller, Equal, or Larger.

Example

Object o
Object t
integer result = o:Compare(t) //1 (larger), 0 (equal), or -1 (smaller)

CumulativeDistribution(number p)

For a random variable {@code X} whose values are distributed according to this distribution, this method returns P(X <= x). In other words, this method represents the (cumulative) distribution function (CDF) for this distribution.

Parameters

  • number p

Return

number: the probability that a random variable with this distribution takes a value less than or equal to x

Equals(Libraries.Language.Object object)

This action determines if two objects are equal based on their hash code values.

Parameters

Return

boolean: True if the hash codes are equal and false if they are not equal.

Example

use Libraries.Language.Object
use Libraries.Language.Types.Text
Object o
Text t
boolean result = o:Equals(t)

GetHashCode()

This action gets the hash code for an object.

Return

integer: The integer hash code of the object.

Example

Object o
integer hash = o:GetHashCode()

GetLowerBound()

Access the lower bound of the support. This method must return the same value as InverseCumulativeProbability(0). In other words, this method must return

Return

number: lower bound of the support

GetMean()

Returns the mean for this distribution.

Return

number: the mean

GetSolverAbsoluteAccuracy()

This action returns the current accuracy of the solving calculations. These are used typically for the inverse calculations.

Return

number: the accuracy

GetUpperBound()

Access the lower bound of the support. This method must return the same value as InverseCumulativeProbability(1). In other words, this method must return

Return

number: upper bound of the support

GetVariance()

Returns the variance for this distribution.

Return

number: the variance

InverseCumulativeDistribution(number p)

This action is an implementation of the Inverse Cumulative Distribution, which is also called the Percent Point Function. NIST describes this as NIST/SEMATECH e-Handbook of Statistical Methods, http://www.itl.nist.gov/div898/handbook/, date. https://www.itl.nist.gov/div898/handbook/eda/section3/eda362.htm

Parameters

  • number p

Return

number: the result of the action

InverseSurvival(number p)

This action is an implementation of the inverse survival function, as described by NIST/SEMATECH e-Handbook of Statistical Methods, http://www.itl.nist.gov/div898/handbook/, date. This action is equivalent to InverseCumulativeDistribution(1 - p) https://www.itl.nist.gov/div898/handbook/eda/section3/eda362.htm

Parameters

  • number p

Return

number: the result of the survival function

IsSupportConnected()

If this action returns true, then all values between the lower and upper bound are supported by this distribution.

Return

boolean: whether or not all values are supported

Survival(number p)

This action is an implementation of the survival function, as described by NIST/SEMATECH e-Handbook of Statistical Methods, http://www.itl.nist.gov/div898/handbook/, date. This action is equivalent to CumulativeDistribution(1 - p) https://www.itl.nist.gov/div898/handbook/eda/section3/eda362.htm

Parameters

  • number p

Return

number: the result of the survival function