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1. From the Data Sets main menu item, edit an existing data set or create a new data set
2. Select New Calculated Variable from the toolbar
3. Attributes tab
   1. Name:  The name of the calculated variable
   2. Description:  An optional description
   3. Code:  A unique name, within the project, for the calculated variable
   4. Include Missing: A checkbox indicating whether to include missing values
4. Variable Finder Tab
   1. Add variables to be used in the calculated variable by clicking the Add icon
   2. See Variable Finder for more details
   3. Click here for a description of the Interval column
5. Expression tab
   1. Language:  Select either JavaScript or VBScript
   2. Expression: Enter a simple expression using the variable's alias or call a function to use a complex expression
   3. User Defined Functions: Define the function using the language selected and the variable's alias.
6. Pick List tab (Optional)
   1. Pick list options can be defined
   2. Click on the Add icon to add a pick list element
   3. Change the Value, if needed, to match the values returned on the Expression tab
   4. Enter a Name for the pick list element
7. Click Continue
8. Click Save and Return or Save

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