An Etymological Dictionary of Astronomy and Astrophysics
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The → covariance of a → time series overt time.

→ auto-; → covariance.

The autocovariance function (ACF) is defined as the sequence of covariances of a stationary process.
A mathematical function that expresses the autocovariance of a series in terms of the interval of separation.

→ autocovariance; → function.