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8 Cards in this Set
- Front
- Back
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Time series |
A set of observations taken at intervals over time |
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Time series graph |
A graph showing how the variable alters over time |
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Trend line |
A line drawn through the points on a time series graph to show the trend |
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Moving average |
An average worked out over successive observations. The number of points of observation should cover one cycle. Moving averages are plotted at the midpoint of the time interval they cover. |
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Seasonal variation |
A pattern of variation either side of the general trend that repeats itself in cycles |
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Average season variation |
The mean of all season variations for that season |
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Predicted value = |
Predicted trend line value + mean seasonal variation for that season |
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Seasonal variation = |
The actual value - trend line value |
