Definition:Constant Mean Level

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Let $S$ be a stochastic process giving rise to a time series $T$.

$T$ has a constant mean level if and only if the mean of $S$ does not change as time progresses.


$1$: Introduction:
$1.2$ Stochastic and Deterministic Dynamic Mathematical Models:
$1.2.1$ Stationary and Nonstationary Stochastic Models for Forecasting and Control