Many statistical packages have three types of equation-building procedures.They are

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The three types of equation-building procedures commonly found in statistical packages are forward, backward, and stepwise. These methods are used in the context of building predictive models, particularly when selecting variables to include in a model. Forward selection starts with no variables and adds them one by one, backward elimination starts with all potential variables and removes them one by one, and stepwise selection is a combination of both, adding and removing variables to find the best model.

Many Statistical Packages Have Three Types of Equation-Building Procedures