arcf model identification what identifies the appropriate arma is arima a model how can a model be identified what is the arima model which model type is associated with arcf why does the arima model need to be identified? which model is apcf what is the geometric progression of the acf curve? what would identify the appropriate arma model by looking at acf/pacfs? what is a arcf what is the geometric progression of the arma model what is acf/pacf why does arima model lag what is a rima model what type of model is a arima what is meant by the name acf and pacf what is the difference between acf and pacf can i identify an arima model from its acf value arma model identification