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Mathematics, 07.05.2021 17:00 Nataliepavon7

Determine which of the following indicates that a nonstationary time series can be represented as a random walk: I. A plot of the series detects a linear trend and increasing variability.
II. The differenced series follows a white noise model.
III. The standard deviation of the original series is greater than the standard deviation of the differenced series.

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