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Statistical models are used in business and economics and in the social, health, behavioral, biological, physical and engineering sciences. The basic goal of statistical modeling is to use the information contained in data to develop a mathematical model describing relationships among the variables being measured. Statistical modeling extends the concept of mathematical modeling by taking into account the stochastic (random) nature of the relationships among the variables. The models that are developed are often used to predict the future behavior of a system, to screen out variables that are relatively unimportant to the system, to understand better the behavior of the system or to support or refute a theory about the behavior of the system.