Moving average, Centered moving average, Ratio to moving average ...

Time Period Quarter Sales 1 3 125.3 2 4 155 3 1 117 4 2 88.5 5 3 103.4 6 4 168.7 7 1 164.9 8 2 100.9 9 3 108.1 10 4 198.9 11 1 151.7 12 2 121.4

We are calculating a 4-period moving average here. So, the first entry ...

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