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U.S. Department of Transportation U.S. Department of Transportation Icon United States Department of Transportation United States Department of Transportation

Table 3. Model for Seasonally Adjusting Vehicle Miles Traveled (VMT)

Wednesday, April 22, 2015

 

Model Type (1) Transformation Trading days / Significance (3) Holidays (2) / Significance (3) Outliers ARIMA(4)
A None Day-of-week *** Labor Day ** None (0 1 1)(0 1 1)
A None Day-of-week *** Thanksgiving * None (0 1 1)(0 1 1)


(1) A = Additive

(2) Holidays

Labor Day = Friday before to Tuesday after (5 days).

Thanksgiving = Tuesday before to Sunday after (7 days)

(3) Significance

*** = significant at 0.01 level

** = significant at 0.05 level

* = significant at 0.10 level

N/S = not significant at 0.10 level

N/A = not applicable

(4) ARIMA = Autoregressive integrated moving average

Source: U.S. Department of Transportation, Bureau of Transportation Statistics