what is the purpose of the ar term in stationary model can arc terms be used in stationary process why use ar terms in stationary series is ar terms useful in stationary sequences what is logical adf which term should be used on stationary series to model which term in a stationary process would lead to the need to apply ari term to an adf test? what term is used on a stationary process when should we use arg terms on stationary series what term is used to describe a process in which the constant variance is independent of the series what is the definition for a stationary process? why use ar terms why use ar terms when to use ar terms in stationary processes? why use arga term is ar term in stationary series logical what is the definition of a stationary series what term is in a stationary series is ar term necessary for stationary series what is logical for an ar term to be used for stable processes?