R

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R is a powerful programming language used in statistical computing and a programming environment. As a language, it is an open-source alternative to the popular S language, armed with a rich kit of statistical techniques (classification, classical statistical tests, clustering, time-series analysis, non-linear and linear modelling), highly extensible and providing great ease of production of publication-quality plots. The R environment in its turn is a kit of software tools for data manipulation, calculation and graphical display, that includes data storage and handling facilities, numerous tools for data analysis, and other effective software means for operations with data.