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			 R is an integrated suite of software facilities for data manipulation, calculation, and graphical display. It includes  
			An effective data handling and storage facility. 
			A suite of operators for calculations on arrays, in particular matrices. 
			A large, coherent, integrated collection of intermediate tools for data analysis. 
			Graphical facilities for data analysis and display either on-screen or on hard copy. 
			A well-developed, simple, and effective programming language which includes conditionals, loops, user-defined recursive functions and input and output facilities.  
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