what is regressor vector how to interpret a regressor vector how does an arima model work arima definition r how to interpret coefficients in ARIMA model what is the regressor for arima what is the difference between arima and forecast what regressors are used in r which coefficient is additive or additive which parameter represents additive effect in an arima regression model? which r parameter is appropriate for using in a forecast regression model? what is the difference between forecast and intervals r how to interpret coefficients in regressor what is the parameter for a regressor in arima why do i insert a regressor coefficient r model definition regressor model which of the following is a additive effect in a regression which model has additive effects arima coefficient r how to interpret regression coefficient in arima