visnights contains quarterly visitor nights (in millions) from 1998 to 2016 for twenty regions of Australia. a. Use window() to create three training sets for visnights[,"QLDMetro"], omitting the last...

visnights contains quarterly visitor nights (in millions) from 1998 to 2016 for twenty regions of Australia.

a. Use window() to create three training sets for visnights[,"QLDMetro"], omitting the last 1, 2 and 3 years; call these train1, train2, and train3, respectively. For example train1 <->

b. Compute one year of forecasts for each training set using the snaive() method. Call these fc1 , fc2 and fc3 , respectively.

c. Use accuracy() to compare the MAPE over the three test sets. Comment on these.