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Abstract:
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Holidays that affect more than one month are included as regressors in seasonal adjustment models to control for the year-to-year variation they introduce. The holiday regressors available for inclusion in seasonal adjustment programs typically control for only pre-holiday activity. These regressors are not ideal for transportation data series, because passenger travel occurs both before, on, and after a holiday. The Bureau of Transportation Statistics of the U.S. Department of Transportation presents transportation specific holiday regressors and their use in the seasonal adjustment of passenger travel by air, rail, transit, and private motor vehicle.
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