NMath Stats is a useful application that contains classes for data manipulation, statistical computation, and biostatistics.

Here are some key features of "NMath Stats":

· A data frame class for holding data of various types (numeric, string, boolean, datetime, and generic), with methods for appending, inserting, removing, sorting, and permuting rows and columns.
· Functions for computing descriptive statistics, such as mean, variance, standard deviation, percentile, median, quartiles, geometric mean, harmonic mean, RMS, kurtosis, skewness, and many more.
· Special functions, such as factorial, log factorial, binomial coefficient, log binomial, log gamma, incomplete gamma, beta, and incomplete beta.
· Probability density function (PDF), cumulative distribution function (CDF), inverse CDF, and random variable moments for a variety of probability distributions, including normal (Gaussian), Poisson, chi-square, gamma, beta, Students t, F, binomial, and negative binomial.
· Multiple linear regression.
· Basic hypothesis tests, such as z test, t-test, and F-test, with calculation of p-values, critical values, and confidence intervals.
· One-way and two-way analysis of variance (ANOVA) and analysis of variance with repeated measures (RANOVA).
· Multivariate statistical analyses, including principal component analysis and hierarchical cluster analysis.