The autocovariance function of the random variable Y t is defined as The spectral density function of a white noise is a constant. The spectral density function of the AR(1) process is given by Refer ...
Periodically correlated, or cyclostationary, time series exhibit statistical properties that vary in a regular, repeating manner. Unlike stationary processes, whose moments remain constant over time, ...
Notice that if (or ) then we get . Jargon: We call the lag and say that for an process the autocovariance function is 0 at lags larger than . To identify an look at a ...
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