Simplest models for Time series are AR and MA models. These models can be fit by using function ARIMA provided by R in stats library. The functions are very straightforward to use but it is important to understand the concepts of time series that are used under the hood of this function. This Vignette elaborates on the theoretical concept of AR and MA model in simplistic manner followed by applying the models using ARIMA function to a dataset from R.

AR and MA model description and comparison.