Numeric - Multi Variable Set

A numeric - multi is a variable set consisting of related numeric variables.  Such data arise in lots of contexts, such as:

• From questions in surveys. For example:

Next to the brands below, please indicate how 
many times you have purchased them in the past week.

Coke ___
Pepsi ___
Fanta ___

• Database (e.g., purchases for different categories of product, where each product is represented by a different variable).
• Geography (e.g., longitude, latitude).
• Biology (e.g., measurements of different aspects of a leaf).