Qualitative variables describe data by placing them into broad categories. For example, the number of units that your business sells over a period of time is a quantitative variable, but your long ...

A two-valued qualitative variable can be represented by a single 0-or-1-valued "dummy" variable. If a qualitative variable has three or more possible values (e.g., make-of-car, or marital-status), ...

Value Is Found In The Additional Variables An instinct to ... they must remember that comparisons go beyond numbers. Quality testing requires qualitative as well as quantitative reasoning.