**Basic Symbolic Expression Simplification** (**simplr**)

Basic tools for symbolic expression simplification, e.g. simplify(x*1) => x, or simplify(sin(x)^2+cos(x)^2) => 1. Based on the ‘Expression v3’ (Ev3) 1.0 system by Leo Liberti.

**Generated Probability Distribution Models** (**gendist**)

Computes the probability density function (pdf), cumulative distribution function (cdf), quantile function (qf) and generates random values (rg) for the following general models : mixture models, composite models, folded models, skewed symmetric models and arc tan models.

**Fit Additive Hazards Models for Survival Analysis** (**addhazard**)

Contains tools to fit additive hazards model to random sampling, two-phase sampling and two-phase sampling with auxiliary information. This package provides regression parameter estimates and their model-based and robust standard errors. It also offers tools to make prediction of individual specific hazards.

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