International tourists in Hawaii

Use this diagram to show how seasonal effects are found by averaging the residuals (raw values minus 12-point moving averages) for each month.

Click on any value to highlight the residuals for the same month in each year. Their average is the seasonal effect for that month.

The lower diagram shows the seasonal effects.

Note the twin peaks in the seasonal pattern.


The data set gives the numbers of international tourists in Hawaii each month from 1990 to 1999.