future values.

The AR component specifies that the current value of the series depends linearly on its own past values (lags), while the MA component specifies that the current value depends on a linear combination of past error terms. An ARMA model is typically denoted as ARMA(p, q), where p is the order of the autoregressive part and q is the order of the moving-average part.

The general ARMA model was described in the 1951

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