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 ...

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 ...

This function has one quantitative and one qualitative input variable. The plot above shows the function for all three possible values of the qualitative z-variable. The quantitative variable x is in ...