statsample 0.7.0

A suite for basic and advanced statistics on Ruby. Tested on Ruby 1.8.7, Ruby 1.9 and JRuby 1.4 (Ruby 1.8.7 compatible) Includes: * Descriptive statistics: frequencies, median, mean, standard error, skew, kurtosis (and many others). * Imports and exports datasets from and to Excel, CSV and plain text files. * Correlations: Pearson's r, Spearman's rank correlation (rho), Tetrachoric, Polychoric * Regression: Simple, Multiple, Probit and Logit * Factorial Analysis: Extraction (PCA and Principal Axis) and Rotation (Varimax and relatives) * Dominance Analysis, with multivariate dependent and bootstrap (Azen & Budescu) * Sample calculation related formulas