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Question
From the following data, calculate the trend values using fourly moving averages.
| Year | 1990 | 1991 | 1992 | 1993 | 1994 | 1995 | 1996 | 1997 | 1998 |
| Sales | 506 | 620 | 1036 | 673 | 588 | 696 | 1116 | 738 | 663 |
Solution
| Year | Sales | 4-Yearly moving total | 4-Yearly moving average | 4-Yearly centered moving average |
| 1990 | 506 | - | - | |
| 1991 | 620 | - | - | |
| 2835 | 708.75 | |||
| 1992 | 1036 | 719 | ||
| 2917 | 729.25 | |||
| 1994 | 673 | 738.75 | ||
| 2993 | 748.25 | |||
| 1995 | 588 | 758.25 | ||
| 3073 | 768.25 | |||
| 1996 | 696 | 776.375 | ||
| 3138 | 784.5 | |||
| 1997 | 1116 | - | - | 793.875 |
| 3213 | 803.25 | |||
| 1998 | 663 | - | - |
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