For the sake of brevity and simplicity, we selected a very small dataset called International Airline Passengers (airpass). The data contains the number of total passengers every month, from January 1949 to December 1960. The numbers in the dataset refer to the amount in thousands. This dataset was originally used by Box and Jenkins in their work in 1976. It was collected as part of TimeSeries Dataset Library (TSDL) along with various other time series datasets by Professor Rob Hyndman at Monash University, Australia. Later, the TSDL was moved to DataMarket (http://datamarket.com).