- The document shows quarterly data for a firm's actual market share compared to 3-quarter and 5-quarter moving average forecasts. - It includes the quarter, actual share, both forecasts, and the errors between actual and each forecast squared. - The totals at the bottom sum the squared errors between actual and each forecast over the periods shown.

6. Quarter
Firm’s actual
market share
Three-quarter Moving
Average Forecast (F)
A-F (A-F)2 Five-quarter Moving
Average Forecast (F)
A-F (A-F)2
1 20 - - - - - -
2 22 - - - - - -
3 23 - - - - - -
4 24 21.67 2.33 5.4289 - - -
5 18 23.00 -5.00 25.0000 - - -
6 23 21.67 1.33 1.7689 21.4 1.6 2.56
7 19 21.67 -2.67 7.1289 22.0 -3.0 9.00
8 17 20.00 -3.00 9.0000 21.4 -4.4 19.36
9 22 19.67 2.33 5.4289 20.2 1.8 3.24
10 23 19.33 3.67 13.4689 19.8 3.2 10.24
11 18 20.67 -2.67 7.1289 20.8 -2.8 7.84
12 23 21.00 2.00 4.0000 19.8 3.2 10.24
total 78.3534 total 62.48
13 - 21.33 20.6

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