classification into mutually exclusive categories
-No logical order is needed, only that the categories differ.(male to female or female to male, there is nothing in between)
-Numbers may be Used, but only to identify categories.
-distinguishing things by kind (male or female, blue eyes or brown eyes)
- NOTE- counting is the only operation you can perform on the data, cant really average these number is these cases. There are “one” more of
- that category or name.