Use a text editor to create a new data set ASHORT.TSM that consists of the data in AIRPASS.TSM with the last twelve values deleted. Use ITSM to find an ARIMA model for the logarithms of the data in...

Use a text editor to create a new data set ASHORT.TSM that consists of the data in AIRPASS.TSM with the last twelve values deleted. Use ITSM to find an ARIMA model for the logarithms of the data in ASHORT.TSM. Your analysis should include for the series BEER.TSM and the shortened series BSHORT.TSM.