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Once you have your data in a table in Tableau, you can right-click on your measure and select Quick Table Calculation, then "Moving Average". Right-click the new calculation and make sure it's calculating the way you want (probably Table Across or Table Down, but possibly by the Day of Traffic Day field). Then, underneath where it says "Moving Calculation" there's another drop-down where you can select how many previous values you want included in the calculation. That's where you can set it to 6 previous and include current.