dart_statistics library

This is the dart_statistics library.

Currently it contains the statistics necessary for doing a chi-squared test, for comparing two distributions.

Other contributions are welcome

Classes

Result

The Result of a chi-squared test

Constants

g → const int

gLN → const double

p → const List<double>

pLN → const List<double>

Functions

calculateChiSquaredStatistic(List<double> observations, List<double> expectations) → Result

Calculates all terms of the chi-squared distribution

calculateSingleChiSquaredTerm(double observed, double expected) → double

Calculates the difference squared divided by the expectation

chiCDF(double z, int df) → double

The chi CDF (Cumulative Distribution Function)

chiGCF(double x, double a) → double

The chi GCF function

chiGser(double x, double a) → double

The chi Gser function

chiPDF(double x, double k) → double

A chi PDF (Probability Distribution Function)

chiSquaredTest(List<double> observations, List<double> expectations, {int degreesOfFreedomReduction = 1}) → Result

Runs a chi-squared test and returns the chi-squared results for each term, the total, as well as the probability

gamma(double z) → double

Gamma function

gammaCDF(double x, double a) → double

The gamma CDF (Cumulative Distribution Function)

lngamma(double z) → double

Spouge approximation (suitable for large arguments)