How to Scale Variables to Have a Common Range

Sometimes it is necessary for multiple categories in a variable to share a common, or unit, range.

Requirements

A data set with a variable that has more than one category.

The simplest way of creating a unit range is to:

Go to the Data Sources tree.
Select the variables you want to recode.
In Properties , click Data > Attributes > Values & Labels, Values, or Categories, depending on the variable set's structure, to edit the Value Attributes.
Manually recode the Value of each category such that they have a common range.
Press OK to save the changes.