Answers
Here are the answers to the previous questions:
- The data needs autocorrelation. We use the chart and the Durbin-Watson statistical test to prove it.
- We multiply the trending line of the regression model by the seasonal irregularity.
- To smooth the cyclical seasonal data movements. With this value, we can calculate the cycling season of the trending line.
- Use the elements of the error to research whether the data has a cyclical trend that could indicate an autocorrelation relationship.