ARIMA Modeling

If we combine differencing with autoregression and a moving average model, we obtain a non-seasonal ARIMA model. ARIMA is an acronym for AutoRegressive Integrated Moving Average model. The term "integration" in this context is the reverse of differencing.

ARIMA model is represented as ARIMA(p,d,q)

Where:

p = order of the autoregressive part
d = degree of first differencing involved
q = order of the moving average part