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And you mention in passing that you want to "attach" an Excel file (whatever that means). This is a completely separate issue, and should be posted in a separate thread, preferably with a title that indicates the nature of the question.
Mike said:The calculation of a moving average is exactly the same as the calculation of any other average. You take the most recent N values of the figure in question, find the sum, and divide by N. In this case, N would be the number of periods over which you want to calculate the average.