why use vecm why use vector error correction model? which step of the process of calculating the vector error correction model should be followed? why use a vector error correction model what kind of error correction model is used in multivariate time series? what is vecm? what is the ___________ model used for multivariate time series why does the var model work which statement refers to the method of estimating the vecm? why use vector error correction model why is the vecm used why use vector error correction what is verma why use vector error correction in multivariate time series why use a vector error correction model which step is the first to estimate the vecm what is var model? which statement is useful in determining that the vector error correction model describes the multivariate time series well? when to use vecm to model multivariate time series why use vecm method