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m a ProcessThe m process, denoted by MA(q) is known to be the general finite order process which is an autoegressive version of a stationary line with covariance. It is stationary in the sense that current conditional expectations are purely dependent on a function of current and lagged shocks. This function is referred to as partial autocorrelation.

MA(q) MA(q) is not an exclusive MA polynomial like AR processes. There are many MA(q), lag operator polynomials which may be stationary, and have the same asymptotic properties.

It is therefore common to place invertibility constraints on the MA polynomial in order to guarantee that the process is causal. This assures that only past events (not future ones) predict current events.

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