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1.4 Stationary Time Series

A time series is said to be stationary if there is change in mean and no change in the variance and if strictly periodicity variations have been removed.

Note. The first and most important step in many time series is to observe what the graph may show.

1.
important features of a time series such as trend seasonality and out lies and discontinuities
2.
describe the data and help in formulating sensible model.

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