# Variables

Description | See Also

## Description

Variables in Draco are arrays of values representing data in the main data set. The variables are displayed in the Data Window. Variables can also have "missing" values within their array, representing blank data points without specification at certain points within the data set.
Because all variables have multiple values, variables are organized into rows across the data set. Therefore, when writing an equation in one of the many dialogs which require this user input, the equations containing variables are evaluated at each row separately using only variable values falling on the specific row. If a row is ever referred to that contains a "missing" value in on of the equation's variables, the result of the equation evaluation will also be "missing."
If the user wishes to represent a value that does not change across the data set, the Constant data type is more appropriate.

## See Also

Data Window
Constants

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