Trend/Seasonals/Dummies Wizard

The Trend/Seasonals/Dummies Wizard allows you to create a variety of dummy variable and related series. Selecting the Wizard from the Data/Graphics menu brings up the following dialog box:

Create

Enter the name of the series you want to create here. You can type in a new name (as we did here with wwii), or click on the arrow to select from a list of all the existing series. If you select an existing series, you can overwrite that series with the new transformation, or edit the selected name to create a new series.

Choose the type of series you want to create. You can choose from:

Trend	generates a SET instruction creating a simple trend series
Seasonal	generates a SEASONAL instruction creating a seasonal dummy. To a include a full set of seasonal dummies in regression lists, you can reference the seasonal dummy and its leads. For example, if SEAS is a quarterly dummy series, you can use "seas{0 to -3}" to get a full set of quarterly dummies.
Time-based Dummy	generates a 0-1 dummy, with the value 1 for a range of consecutive time periods, and the value 0 elsewhere. When you select this choice, additional fields appear allowing you to select the range of entries that will have the value 1.0. In this case, the dummy will have ones from 1941:1 to 1945:1.
Random	generates a SET instruction, creating a series of random numbers, drawn from a normal distribution with a standard deviation of 1.0.

Sample Start and End

Use these fields if you want to specify the start and/or end of the sample range. Leave these blank if you want to use the default range.

Start and End for 1.0 Value

These fields appear when creating a Time-based Dummy series. Use them to specify the range of entries that will have the value 1.0. The rest of the series will have the value 0.0.