Regression is a well-known statistical technique to model the predictive­ relationship between several independent variables (DVs) and one ­dependent variable. The objective is to find the best-fitting curve for a dependent variable in a multidimensional space, with each independent variable being a dimension. The curve could be a straight line, or it could be a nonlinear curve. The quality of fit of the curve to the data can be measured by a coefficient of correlation (r), which is the square root of the amount of variance explained by the curve.

The key steps for regression are simple:

   1. List all the variables available for making the model.

   2. Establish a dependent variable of interest.

   3. Examine visual (if ...

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