what is the difference between granger's and var? why is var necessary? why use var in granger test why is it important to calculate var before granger causality test what is the difference between granger test and var what is the difference between granger and variegated is it necessary to do var and granger why do i need to do granger test what is var before granger test how to use granger causality test can granger testing be used before var what is the difference between granger testing and var why is var important in granger test what is the granger causality test? what is the difference between granger causality test and var? is var granger why is var and granger test necessary when to use granger and var when to do var in granger test what is the difference between granger and var