Consider the following time series data. Quarter Year 1 Year 2 Year 3 1 4 7 8 2 2 3 6 3 3 5 6 4 5 7 8 Show the four-quarter and centered moving average values for this time series (to 3 decimals if necessary). Year Quarter Time Series Value Four-Quarter Moving Average Centered Moving Average 1 1 4 2 2 3 3 4 5 2 1 7 2 3 3 5 4 7 3 1 8 2 6 3 6 4 8 Compute seasonal indexes and adjusted seasonal indexes for the four quarters (to 3 decimals). Quarter Seasonal Index Adjusted Seasonal Index 1 2 3 4 Total
Added by Gerald B.
Step 1
We can do this by taking the average of each group of four consecutive quarters. Year 1 Quarter 2: (4 + 2 + 3 + 5) / 4 = 3.5 Year 1 Quarter 3: (2 + 3 + 5 + 7) / 4 = 4.25 Year 1 Quarter 4: (3 + 5 + 7 + 7) / 4 = 5.5 Year 2 Quarter 1: (5 + 7 + 7 + 8) / 4 = Show more…
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