The table below is a crosstab of a Date question (in the columns) by average satisfaction with various colas (a Number question):

This is what the table looks like after the values have been changed to rolling average:

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.

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How to Apply Significance Testing in Displayr