Stats GCSE Time Series

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13 Terms

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What is a time series graph?
A line graph with time plotted on the x axis
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What does a trend line do?
Shows the general trend of the data
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What kinds of trends are there?
Rising, level or falling
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What’s a seasonal variation?
Variations in a time series following a regular time period like days of the week or seasons
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Whats a moving average?
An average worked out for a given number of successive observations
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What do moving averages do?
Smooth out the fluctuations the data and make the trend line more accurate
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How to calculate seasonal variation
Actual value- trend value
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How do you plot a moving average?
Plot them at the midpoint of the time interval
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How to calculate estimated mean seasonal variation
Mean of all seasonal variation for that season
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What’s another way to say seasonal variation
Seasonal effect
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What’s another way to say estimated mean seasonal variation?
Average seasonal effect
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How to calculate predicted value
Trend line value+ EMSV
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What does the reliability of a prediction depend on?
How far into the future the prediction is

How consistent the SV is