For the usgdp series: a. if necessary, nd a suitable Box-Cox transformation for the data; b. t a suitable ARIMA model to the transformed data using auto.arima() ; c. try some other plausible models by...


For the usgdp series:


a. if necessary, nd a suitable Box-Cox transformation for the data;


b. t a suitable ARIMA model to the transformed data using auto.arima() ;


c. try some other plausible models by experimenting with the orders chosen;


d. choose what you think is the best model and check the residual diagnostics;


e. produce forecasts of your tted model. Do the forecasts look reasonable?


f. compare the results with what you would obtain using ets() (with no transformation).



May 04, 2022
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