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Statistics gem documentation

Here you will find the documentation for each of the possible functions and classes needed to work with the gem.

Notes:

• If you are using BigDecimal, keep in mind that this gem will coerce it to Rational, for speed and accuracy.

Categories

Distributions

• Bernoulli distribution
• Beta distribution
• Binomial distribution
• Chi-squared distribution
• F distribution
• Geometric distribution
• LogSeries distribution
• Negative Binomial distribution
• Normal distribution
• Standard Normal distribution
• Inverse Standard Normal distribution (Also known as quantile function for standard normal distribution).
• Poisson distribution
• T-Student distribution
• Continuous Uniform distribution
• Weibull distribution
• Empirical distribution function (ECDF)
• Gamma distribution

Tables

• Chi Squared distribution table

Statistical tests

A note about p-values

It's important to keep in mind this bug #13 conditioned by the way ruby calculates the decimal values. I hope to find a solution to that. (Fixed in version 2.0.1).

• Student's T-test
• One way ANOVA and F-Test
• Goodness of fit test (Chi squared Distribution).
• Wilcoxon Rank-Sum test (Also known as Mann-Whitney U test).
• Kolmogorov-Smirnov test (KS Test).

Utilities

• Spearman's Rank Coefficient.