2. If the plotted series shows no obvious change in the variance over time, then we say...
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2. If the plotted series shows no obvious change in the variance over time, then we say the series is stationary in the variance.
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Related Book For 
Forecasting Methods And Applications
ISBN: 9780471532330
3rd Edition
Authors: Spyros G. Makridakis, Steven C. Wheelwright, Rob J Hyndman
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