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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 |
Chart
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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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Time Series Analysis
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| 1979 | 126 |
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| 1982 | 128 |
| 1983 | 125 |
| 1984 | 124 |
| 1985 | 130 |
| 1986 | 114 |
| 1987 | 122 |
| 1988 | 129 |
| 1989 | 118 |
| 1990 | 123 |
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| Year | 1980 | 1981 | 1982 | 1983 | 1984 | 1985 | 1986 | 1987 |
| Sales | 50.3 | 52.7 | 49.3 | 57.3 | 56.8 | 60.7 | 62.1 | 58.7 |
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