which model does chi square in excel come from when are arma models made arima model lag ramos model number what is the range of arima in minitab how to find the df for arima model in minitab rima data lags ARIMA model formula excel when to use arima in minitab excel minitab df number what is a df in arima how to do an arima model what is the model for arima how many observations are in arima what is the final parameter in arca what is arma model df what is arma model model rama data mintab how to calculate arima value what is max of arga in minitab