#Antonia is very orgnized. she explaines the steps and the reasons for using each test. I like when she try to use many values for AR model until she found lowest AIC. Then she try to make sure that is best model by Checking model for adequacy using Ljunb-Box test at many lags.
#In question 3, she does not take log for data. Also she does not use log, log-change, seasonal log change.
#She has to try another different models until she got model with best result. as we can seen in her model ARIMA there are many corrolated residuals.