Quantitative variables take the form of numerical figures. Qualitative variables describe data by placing them into broad categories. For example, the number of units that your business sells over a ...

At times it is desirable to have independent variables in the model that are qualitative rather than quantitative. This is easily handled in a regression framework. Regression uses qualitative ...

This function has one quantitative and one qualitative input variable. The plot above shows the function for both possible values of the qualitative z-variable. The quantitative variable x is in [0, 1 ...