Time Series Analysis, Time Series Forecasting, Time Series Model, Machine Learning, Data Science.
Using ACF and PACF to choose model order: By looking at the autocorrelation function (ACF) and partial autocorrelation (PACF) plots of the differenced series, you can tentatively identify the numbers of AR and/or MA terms i.e p,q that are needed. ACF is used to identify order of MA term, and PACF