Article
The m process is represented by MA(q) it happens to be a general finite order process which is an autoregressive variant of a stationary series with covariance. It is stationary in the sense that the current expectation of conditional events is based solely on the function of the current and lagged unobserved shocks. This function is referred to board meeting minutes as partial autocorrelation.
MA(q) MA(q) does not possess an individual MA polynomial, which is different from AR processes. In fact, there are a variety of possibilities for MA(q) lag operator polynomials that may be stationary and possess the same asymptotic characteristics.
It is therefore normal to impose invertibility restrictions on the MA polynomial in order to ensure that the process is causal. This ensures that past events (and not future ones) are the only ones that can be predicted by current events.