This article describes how to go from a crosstab with a time series variable...
...to a table with a lagged rolling average:
1. Select your table.
2. Go to Properties > RULES on the object inspector.
3. To apply the rule, select the Plus (+) > Browse Online Library > Modify Whole Table or Plot > Replace with Rolling Averages.
4. Set the Number of periods to roll.
5. OPTIONAL: Tick Dates are in the rows if applicable.
6. Press OK.
Please note the following:
- A lagged rolling average is computed. For example, if January has a score of 3, February 4, and March 6, the 3-period rolling average for March is (3 + 4 + 6) / 3 = 4.33333333.
- Where values cannot be computed due to insufficient data, the value is shown as NaN. For example, if January has a score of 3, February 4, and March 6, the 3-period rolling average for the three months, respectively, are NaN, NaN, and 4.33333333.
- This rule is only applied to the first statistic selected in each of STATISTICS > Cells and whichever is appropriate of STATISTICS > Below and STATISTICS > Right.
- You may not have a NET in the variable containing the dates.