=+39. Hawaii tourism pre-crisis. Much of the public and private industry in Hawaii depends on tourism. The following time series plot shows the number of domestic visitors to Hawaii by air from the rest of the United States per month from January 2002 through December 2006 before the financial crisis of 2008.

300,000 375,000 525,000 450,000 0 10 20 30 40 6 50 0 Domestic Visitors Time Here is a regression model fit to these data with dummy variables for months and a Time variable that starts at 0 and counts months: