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 ...

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 ...

or the square of an existing variable. 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 ...

Now, this can be broken down into two categories: variable and attribute data. Understanding the difference and learning how it is applicable during the analysis stage can be crucial for future ...