(a) Explain the following notions of heterogeneity: (a) identical distribution, (b) strict stationarity, (c) first-order stationarity, (d)...

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(a) Explain the following notions of heterogeneity:

(a) identical distribution,

(b) strict stationarity,

(c) first-order stationarity,

(d) second-order stationarity,

(e) mth-order stationarity.

(b) Explain why a strictly stationary process is not necessarily second-order stationary.

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