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AR models forecast a series based solely on past values of the series, called lags. MA models forecast a series based solely on past errors in the series, called error lags.

Conditions: Forecasting a time series; Uses past values of the same series for AR; Uses past errors for MA

AR models forecast a series based solely on past values of the series, called lags. MA models forecast a series based solely on past errors in the series, called error lags.

Conditions: Forecasting a time series; Uses past values of the same series for AR; Uses past errors for MA