Compare ets() , snaive() and stlf() on the following six time series. For stlf() , you might need to use a Box-Cox transformation. Use a test set of three years to decide what gives the best...

Compare ets() , snaive() and stlf() on the following six time series. For stlf() , you might need to use a Box-Cox transformation. Use a test set of three years to decide what gives the best forecasts. ausbeer , bricksq , dole , a10 , h02 , usmelec .

a. Use ets() on the following series:

bicoal , chicken , dole , usdeaths , lynx , ibmclose , eggs . Does it always give good forecasts?

b. Find an example where it does not work well. Can you gure out why?