Question: For a random walk to be an appropriate model for a time series, which of the following should be true? a. There shouldn't be any

For a random walk to be an appropriate model for a time series, which of the following should be true?

a. There shouldn't be any significant autocorrelations in the series.

b. Except for noise, each value in the series should equal the previous value plus a constant.

c. Except for noise, the series should be flat.

d. All of these choices are true.

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