General

Legacy ID

201

Table 11. Distribution of Person Mile Estimates

Census Region/ Division Urban Group Count of outliers Distribution of person mile estimates after excluding outliers and tracts missing one or more travel estimates Spatial Bottom/ Top 0.5% N Mean Standard...

Table 10. Independent Variable Derivations from 2007-2011 American Community Survey

Variable Formula (ACS Table ID + ‘e’ + Line Number) Households B11005e1 Independent Variables Household Income (Thousands $) B19013e1 Natural Log (Household Income) Natural Log (B19013e1...

Table 9. Validation Process: Prediction of Person Miles Using American Community Survey Data (ACS)

Variable Regression parameter Value for Census Tract 19113000400 (from 2005-2009 ACS) Col. (A) * (B) Col. (A) Col. (B) Col. (C) Intercept -18.5328 NA -18.5328 Nat. Log (HH Income) 6....

Table 8. Correlation between Independent Variables (Excluding Life-cycle Indicators) for the Sample Used to Predict Person Miles in the Midwest Region, by Urban Group

Census Region/ Division Urban Group Variable Household Income Count of Household Vehicles Count of Household Members Number of Workers in Household Homeowner 1+ child Midwest Urban Household Income 1.00 0.39...

Table 7. Comparison NHTS Mean Values and Regression Estimates

Census Region/Division Category and Urban Group Household Person Miles Traveled Household Number of Person Trips Household Vehicle Miles Traveled Household Number of Vehicle Trips Mean Std. Error Reg. Estimate...

Figure 4. NHTS Vehicle Trip Means and 95% Confidence Intervals