Exercise

Diagnostics - global temperatures

You can now finish your analysis of global temperatures. Recall that you previously fit two models to the data in globtemp, an ARIMA(1,1,1) and an ARIMA(0,1,2). In the final analysis, check the residual diagnostics and use AIC and BIC for model choice.

The data are plotted for you.

Instructions

100 XP

Fit an ARIMA(0,1,2) model to globtemp and check the diagnositcs. What does the output tell you about the model?
Fit an ARIMA(1,1,1) model to globtemp and check the diagnostics.
Which is the better model? Type your answer into the blanks in your R workspace (ex. either ARIMA(0,1,2) or ARIMA(1,1,1)).

Take Hint (-30 XP)