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Appendix B. Validation results

Tuesday, April 21, 2015

Excel

Table B1. Validation Results for Person Miles

Census Region/ Division Urban Group Median Census Tract Value 
Person miles 
Number of Tracts Mean percent of households with NHTS data NHTS NHTS Est. MAPE
NHTS vs. NHTS Est.
Percent difference NHTS est. v. NHTS ACS Est. MAPE
NHTS vs. ACS Est.
Percent difference ACS est. v. NHTS
Northeast Urban 38 0.53 57.1 46 15 -19.6 48.1 15.8 -15.8
Suburban 67 0.69 60 64.5 15.6 7.4 72.6 16.2 21
Rural 142 0.62 73.7 73.3 15.7 -0.5 79.2 18.3 7.4
Midwest Urban 24 0.79 45.6 59.4 16.4 30.4 58.5 14.5 28.5
Suburban 23 0.8 44.5 63.5 20.3 42.5 66.9 22.3 50.3
Rural 30 0.74 65.3 90.7 23.4 39 91.3 25 39.8
South Atlantic Urban 121 0.44 46.8 47.3 9.4 1.1 52.4 13.5 11.9
Suburban 317 0.55 60.1 61.3 12.6 1.9 68.2 16.7 13.3
Rural 445 0.55 73.7 77.7 14.6 5.5 86.8 20.6 17.8
East South Central and West South Central Urban 79 0.31 62.8 58.8 12.5 -6.3 60.8 13.6 -3.1
Suburban 79 0.31 76.5 73.2 16.7 -4.3 76.3 18.6 -0.2
Rural 164 0.31 78.8 85.2 20.8 8.2 97.6 24.7 24
Mountain Urban 53 0.39 44.2 53.5 15.5 21.2 52.5 20.1 19
Suburban 46 0.45 56.7 57.4 11.1 1.1 65.3 9.6 15
Rural 51 0.32 64.2 74.8 19.6 16.5 90 23.1 40
Pacific Urban 110 0.5 55.8 53.9 9.9 -3.6 60.1 13.1 7.6
Suburban 45 0.5 56.3 58.7 11.6 4.3 66.5 11.8 18
Rural 45 0.38 71.6 64.5 16 -9.9 70.5 13.9 -1.6

NOTE: MAPE = Median absolute percent error. Absolute percent difference between NHTS data value and predicted data value calculated for each Census tract. Median of differences for each Census region/division and urban group calculated to find the MAPE. Percent difference is the difference between the median NHTS value for each Census region/division and urban group and the median predicted value.

States included by Census Region: Northeast = NY (excluding Census tracts in Manhattan), VT; Midwest = IN, IA, NE, SD; South Atlantic = FL, GA, NC, SC, VA; East South Central and West South Central = AL, TN, TX; Mountain = AZ; Pacific = CA

Table B2. Validation Results for Person Trips

Census Region/ Division Urban Group Median Census Tract Value 
Person trips 
Number of Tracts Mean percent of households with NHTS data NHTS NHTS Est. MAPE
NHTS vs. NHTS Est.
Percent difference NHTS est. v. NHTS ACS Est. MAPE
NHTS vs. ACS Est.
Percent difference ACS est. v. NHTS
Northeast Urban 38 0.53 7.8 7.6 0.6 -2.4 8.5 1.8 8.4
Suburban 66 0.7 8.3 8.3 1.3 0.6 9.2 1.5 11.3
Rural 143 0.62 8.4 8.2 1 -2.3 9.1 1.6 8.7
Midwest Urban 22 0.79 8.8 9 0.7 2.4 9.5 1.7 8.3
Suburban 23 0.8 8.4 8.7 0.5 2.8 8.9 1 5.8
Rural 29 0.73 8.8 9.4 1.4 6 10 2 13.2
South Atlantic Urban 118 0.45 7.4 7 1 -4.3 8.5 1.2 15
Suburban 319 0.54 8.2 7.8 0.9 -4.2 8.9 1.3 8.7
Rural 451 0.55 7.7 7.6 1 -1.8 8.7 1.4 12.7
East South Central and West South Central Urban 79 0.32 7.9 8.4 1.1 6.7 9.6 1.6 22
Suburban 79 0.31 9 9.1 1 1.1 10.5 1.4 17
Rural 166 0.31 8.1 8.1 0.9 -0.9 9.9 1.7 22.4
Mountain Urban 66 0.4 7.8 7.2 1 -7.4 8.6 2.1 10.1
Suburban 46 0.46 8.3 8.3 1.1 0.3 9 1.3 8.7
Rural 52 0.32 8.2 8.5 1.1 4.2 9.9 1.8 21.2
Pacific Urban 106 0.5 8.4 8.1 1.1 -3.5 9.3 1.7 11.3
Suburban 47 0.49 8.9 8.4 1.1 -6.4 9.9 1.3 11.1
Rural 46 0.39 8.1 8.6 1 5.7 9.7 1.6 19.6

NOTE: MAPE = Median absolute percent error. Absolute percent difference between NHTS data value and predicted data value calculated for each Census tract. Median of differences for each Census region/division and urban group calculated to find the MAPE. Percent difference is the difference between the median NHTS value for each Census region/division and urban group and the median predicted value.

States included by Census Region: Northeast = NY (excluding Census tracts in Manhattan), VT; Midwest = IN, IA, NE, SD; South Atlantic = FL, GA, NC, SC, VA; East South Central and West South Central = AL, TN, TX; Mountain = AZ; Pacific = CA

Table B3. Validation Results for Vehicle Miles

Census Region/ Division Urban Group Median Census Tract Value 
Vehicle Miles 
Number of Tracts Mean percent of households with NHTS data NHTS NHTS Est. MAPE
NHTS vs. NHTS Est.
Percent difference NHTS est. v. NHTS ACS Est. MAPE
NHTS vs. ACS Est.
Percent difference ACS est. v. NHTS
Northeast Urban 39 0.54 29.2 32.8 7.4 12.3 32 8 9.7
Suburban 65 0.71 48.1 50.6 13.3 5.1 54.3 10.7 13
Rural 142 0.62 54.9 55.1 9.4 0.3 57.7 12.3 5
Midwest Urban 24 0.79 36.3 43.3 11 19.2 39.6 10.1 9
Suburban 23 0.8 36.8 45.3 13.2 23 48.7 12.1 32.4
Rural 30 0.73 49.3 62.7 15 27.2 65.5 13.8 32.9
South Atlantic Urban 121 0.44 35.5 36.1 7.5 1.7 38 8 7.2
Suburban 317 0.54 42.7 46.2 8.9 8.3 49.3 11.9 15.4
Rural 450 0.55 53.1 56.3 10.6 6 60.5 13.6 13.8
East South Central and West South Central Urban 78 0.31 45.6 44.1 9.7 -3.3 45.1 10.3 -0.9
Suburban 79 0.31 54.5 54.1 10.9 -0.7 56 11.2 2.8
Rural 163 0.31 57.9 57.9 11.1 0 64.3 14.2 11.2
Mountain Urban 54 0.38 30 34.7 8.1 15.8 34 9.9 13.3
Suburban 52 0.49 42.4 41.7 10.3 -1.5 44.7 8.7 5.4
Rural 51 0.32 50.7 51.4 11.3 1.3 63.5 15.8 25.1
Pacific Urban 108 0.5 38.2 39.3 7.5 2.7 42.5 9.3 11.2
Suburban 45 0.5 44.9 43.2 9 -3.8 49.8 9.4 10.8
Rural 47 0.38 50.2 46.4 11.5 -7.6 51.2 13.9 1.9


NOTE: MAPE = Median absolute percent error. Absolute percent difference between NHTS data value and predicted data value calculated for each Census tract. Median of differences for each Census region/division and urban group calculated to find the MAPE. Percent difference is the difference between the median NHTS value for each Census region/division and urban group and the median predicted value.

States included by Census Region: Northeast = NY (excluding Census tracts in Manhattan), VT; Midwest = IN, IA, NE, SD; South Atlantic = FL, GA, NC, SC, VA; East South Central and West South Central = AL, TN, TX; Mountain = AZ; Pacific = CA

Table B4. Validation Results for Vehicle Trips

Census Region/ Division Urban Group Median Census Tract Value 
Vehicle Trips 
Number of Tracts Mean percent of households with NHTS data NHTS NHTS Est. MAPE
NHTS vs. NHTS Est.
Percent difference NHTS est. v. NHTS ACS Est. MAPE
NHTS vs. ACS Est.
Percent difference ACS est. v. NHTS
Northeast Urban 38 0.53 4.9 4.8 0.7 -1.2 4.7 0.7 -3.5
Suburban 66 0.7 5.8 5.9 0.9 2.7 5.9 1 1.7
Rural 143 0.62 5.7 5.7 0.6 0.8 6 1 6.2
Midwest Urban 23 0.78 6.2 6.1 0.4 -2.1 5.9 0.7 -5.1
Suburban 23 0.81 6.4 6.2 0.3 -2.8 6.2 0.7 -2.7
Rural 30 0.75 6.3 6.3 0.9 -0.4 6.6 0.9 3.8
South Atlantic Urban 120 0.44 5.2 4.9 0.6 -6.3 5 0.8 -2.8
Suburban 321 0.55 5.8 5.6 0.7 -3.3 5.9 0.8 1.5
Rural 452 0.55 5.3 5.3 0.7 1.2 5.7 0.8 7.5
East South Central and West South Central Urban 82 0.32 5.9 6.1 0.7 3 6.2 1 6.1
Suburban 80 0.31 6.2 6.7 0.9 6.8 6.9 1 10.8
Rural 167 0.31 5.7 5.7 0.8 0.3 6.5 1 14.9
Mountain Urban 65 0.4 5.1 4.8 0.8 -6.4 5.4 1.1 5.5
Suburban 46 0.46 5.8 5.9 0.7 2.2 5.9 0.7 3.2
Rural 52 0.32 5.5 6 0.7 9.1 6.7 1 22
Pacific Urban 108 0.5 5.7 5.4 0.7 -5.5 5.7 1 -0.3
Suburban 47 0.49 6 5.5 1.1 -7.9 6.3 1 5.8
Rural 47 0.39 5.6 5.8 0.8 3.1 6.1 1 8.7

NOTE: MAPE = Median absolute percent error. Absolute percent difference between NHTS data value and predicted data value calculated for each Census tract. Median of differences for each Census region/division and urban group calculated to find the MAPE. Percent difference is the difference between the median NHTS value for each Census region/division and urban group and the median predicted value.

States included by Census Region: Northeast = NY (excluding Census tracts in Manhattan), VT; Midwest = IN, IA, NE, SD; South Atlantic = FL, GA, NC, SC, VA; East South Central and West South Central = AL, TN, TX; Mountain = AZ; Pacific = CA

Table B5. Comparison of Means for Sample Used in Validating Models to Predict Person Miles

Census Region/ Division Urban Group Median Census Tract Value Median Census Tract Value Median Census Tract Value
Household Income (Thousands) Count of Household Vehicles Count of Household Members Count of Workers in Household Homeowner (Percent) 1+ Child < 18 (Percent) 1 Person Household, <65 2+ Person Household, 0 65+ (Percent) 2+ Person household, 1+ 65+ (Percent)
NHTS ACS MAPE ACS v. NHTS NHTS ACS MAPE ACS v. NHTS NHTS ACS MAPE ACS v. NHTS NHTS ACS MAPE ACS v. NHTS NHTS ACS MAPE ACS v. NHTS NHTS ACS MAPE ACS v. NHTS NHTS ACS MAPE ACS v. NHTS NHTS ACS MAPE ACS v. NHTS NHTS ACS MAPE ACS v. NHTS
Northeast Urban 47.5 50.9 35.1 1.7 1.6 10.9 2.2 2.4 14 0.8 0.7 15.8 0.9 1.2 25.8 0.2 0.3 43.8 0.1 0.2 50.6 0.5 0.6 21.9 0.2 0.1 42.2
Suburban 67.5 75.8 17.8 2 1.9 13.3 2.5 2.6 9.8 0.9 0.8 15.5 1 1.3 25.7 0.2 0.4 71.8 0.1 0.1 37.7 0.6 0.6 22 0.2 0.1 42.9
Rural 57.5 60.7 20.5 2.1 2 11.1 2.4 2.6 11.2 0.9 0.8 10.1 1.1 1.3 22.5 0.2 0.3 55.2 0.1 0.1 38.5 0.6 0.6 22 0.2 0.2 41.8
Midwest Urban 47.5 52.8 16.3 2.1 1.8 15.8 2.4 2.4 7.9 0.9 0.7 22.3 1.2 1.3 19.4 0.2 0.3 52.9 0.1 0.2 32.7 0.5 0.6 23.2 0.2 0.1 61.1
Suburban 67.5 55.1 12.7 2.2 1.9 12 2.4 2.4 8.8 0.9 0.8 16.5 1.1 1.2 12.9 0.2 0.3 69.2 0.1 0.2 88.7 0.6 0.6 17.6 0.2 0.1 37.4
Rural 65 70.6 11.2 2.5 2.2 9.5 2.8 2.7 13.5 0.9 0.9 9.8 1.3 1.5 13.3 0.3 0.4 52.2 0.1 0.1 42.2 0.7 0.7 15.6 0.2 0.1 32.8
South Atlantic Urban 47.5 52.2 15.6 1.9 1.7 13.1 2.2 2.5 15 0.9 0.7 22.9 0.9 1.2 37.5 0.1 0.3 84.2 0.1 0.2 39.2 0.4 0.5 17.9 0.3 0.1 46.5
Suburban 57.5 58.3 19.2 2.1 1.9 11.2 2.3 2.5 11.5 0.9 0.8 16.1 0.9 1.2 28 0.2 0.3 75.5 0.1 0.2 41 0.5 0.6 22.1 0.3 0.2 47.6
Rural 47.5 50.6 18.1 2.3 2.1 11.6 2.3 2.6 12.5 1 0.8 13.1 0.9 1.2 28.8 0.2 0.3 82.5 0.1 0.1 46.7 0.5 0.6 22.4 0.3 0.2 46
East South Central and West South Central Urban 70 65.4 21 2.1 1.9 12.5 2.4 2.7 15.7 1 0.8 18.6 1.1 1.4 21.6 0.2 0.4 79.3 0.1 0.1 44.9 0.6 0.6 19.6 0.3 0.1 53.2
Suburban 90 81.4 21.9 2.3 2 13.8 2.7 3 14.2 1 0.8 14.2 1.2 1.4 20.6 0.3 0.5 49.1 0 0.1 42.8 0.7 0.7 11.2 0.2 0.1 50.7
Rural 72.5 69 19 2.2 2.1 10.7 2.5 2.9 16.5 1 0.9 11.7 1 1.4 33.3 0.2 0.4 85.6 0.1 0.1 34.7 0.6 0.7 15.3 0.2 0.1 45.5
Mountain Urban 47.5 46.7 17.7 1.8 1.7 13.1 2.1 2.5 20.9 0.9 0.7 25.9 0.9 1.3 46.3 0.1 0.3 75.3 0.1 0.2 39.7 0.4 0.5 33.9 0.3 0.1 52.6
Suburban 66.3 71.3 17.2 2 1.9 7.7 2.3 2.5 14.1 1 0.8 12.9 1 1.2 24.8 0.1 0.3 38.6 0.1 0.1 42.7 0.5 0.6 20 0.3 0.2 40.6
Rural 65 66 14.9 2.2 2 12.1 2.4 2.8 12.7 0.9 0.9 9.7 1.1 1.3 33 0.2 0.4 48.4 0 0.1 63.3 0.5 0.6 20 0.4 0.2 44.9
Pacific Urban 62.5 69.8 28.6 2.1 2 11.8 2.4 2.7 16.1 0.9 0.7 19.6 1 1.3 34.5 0.2 0.3 48.9 0.1 0.1 48.5 0.5 0.6 24.3 0.3 0.2 47.8
Suburban 75 89.2 17.8 2.3 2.1 10.9 2.2 2.6 15.1 0.9 0.8 12.2 0.9 1.3 44.2 0.1 0.3 81.2 0.1 0.1 35.2 0.4 0.6 26.9 0.3 0.2 40.3
Rural 72.5 83.3 19 2.5 2.2 9.6 2.5 2.8 10.4 0.9 0.8 13.4 1 1.3 25.5 0.2 0.4 57.7 0 0.1 47.3 0.5 0.7 13.4 0.3 0.2 49.2

NOTE: MAPE = Median absolute percent error. Absolute percent difference between NHTS data value and ACS data value calculated for each Census tract. Median of differences for each Census region/division and urban group calculated to find the MAPE.

States included by Census Region: Northeast = NY (excluding Census tracts in Manhattan), VT; Midwest = IN, IA, NE, SD; South Atlantic = FL, GA, NC, SC, VA; East South Central and West South Central = AL, TN, TX; Mountain = AZ; Pacific = CA

Table B6. Comparison of Means for Sample Used in Validating Models to Predict Person Trips

Census Region/ Division Urban Group Median Census Tract Value Median Census Tract Value Median Census Tract Value
Household Income (Thousands) Count of Household Vehicles Count of Household Members Count of Workers in Household Homeowner (Percent) 1+ Child < 18 (Percent) 1 Person Household, <65 2+ Person Household, 0 65+ (Percent) 2+ Person household, 1+ 65+ (Percent)
NHTS ACS MAPE ACS v. NHTS NHTS ACS MAPE ACS v. NHTS NHTS ACS MAPE ACS v. NHTS NHTS ACS MAPE ACS v. NHTS NHTS ACS MAPE ACS v. NHTS NHTS ACS MAPE ACS v. NHTS NHTS ACS MAPE ACS v. NHTS NHTS ACS MAPE ACS v. NHTS NHTS ACS MAPE ACS v. NHTS
Northeast Urban 47.5 50.9 34.2 1.7 1.6 11.4 2.2 2.4 15.7 0.8 0.7 14.1 0.9 1.2 26 0.2 0.3 42.8 0.1 0.2 50 0.5 0.6 20.4 0.2 0.1 42.2
Suburban 67.5 75.5 17.9 2 1.9 13.1 2.5 2.6 10.2 0.9 0.8 15.3 1 1.3 25.5 0.2 0.4 74.4 0.1 0.1 38.9 0.5 0.6 22.4 0.3 0.1 42.9
Rural 57.5 60.8 20.4 2.2 2 10.4 2.4 2.5 11.1 0.9 0.8 10.1 1.1 1.3 22.5 0.2 0.3 54.7 0.1 0.1 37 0.6 0.6 21.3 0.2 0.2 42.7
Midwest Urban 47.5 52.4 14.5 2.1 1.8 13.9 2.2 2.4 8 0.9 0.7 23.4 1.2 1.3 20.5 0.1 0.3 66.5 0.1 0.2 34.1 0.5 0.6 28.1 0.2 0.1 59
Suburban 60 55.1 15.1 2.2 1.9 12 2.4 2.4 8.8 0.9 0.8 16.8 1.1 1.2 14.8 0.2 0.3 73.4 0.1 0.2 92.7 0.5 0.6 15.7 0.2 0.1 42.7
Rural 67.5 69.9 13.4 2.6 2.2 9.1 2.6 2.7 14.3 0.9 0.9 10 1.3 1.5 13.5 0.3 0.4 73.6 0.1 0.1 42.2 0.6 0.7 16.7 0.2 0.1 34.2
South Atlantic Urban 47.5 51.5 15.9 1.9 1.7 12.3 2.2 2.5 15 0.9 0.7 22.6 0.8 1.2 38.7 0.1 0.3 85.7 0.1 0.2 39.3 0.4 0.5 17.8 0.3 0.1 45.8
Suburban 57.5 57.3 18.6 2.1 1.9 11.5 2.3 2.5 11.5 0.9 0.8 16.1 0.9 1.2 28.4 0.1 0.3 78.7 0.1 0.2 42.4 0.5 0.6 22.1 0.3 0.2 47.5
Rural 47.5 50.6 19.2 2.3 2.1 11.6 2.3 2.6 12.5 1 0.8 13.4 0.9 1.2 28.9 0.2 0.3 82.8 0.1 0.1 49.8 0.5 0.6 21.4 0.3 0.2 46.3
East South Central and West South Central Urban 70 66.6 22.8 2.1 1.9 12.2 2.4 2.7 16.3 1 0.8 18.6 1.1 1.4 24.4 0.1 0.4 83.4 0.1 0.1 43.3 0.6 0.6 19.6 0.3 0.1 52.7
Suburban 90 80.5 21.4 2.3 2 13.8 2.6 3 12.8 1 0.8 14.2 1.2 1.4 22.3 0.3 0.5 70.7 0 0.1 42.1 0.7 0.7 11.7 0.2 0.1 51.5
Rural 71.3 68.7 18.5 2.2 2.1 10.5 2.4 2.9 17.9 1 0.9 10.7 1 1.4 35 0.2 0.4 83.5 0.1 0.1 34.7 0.6 0.7 16.7 0.2 0.1 44.6
Mountain Urban 50 48.4 19.8 1.8 1.6 12.4 2.1 2.5 20.9 0.9 0.7 24.6 0.9 1.3 44.5 0.1 0.3 71.4 0.1 0.2 59.6 0.4 0.5 31.5 0.3 0.1 51.8
Suburban 67.5 71.3 16.4 2 1.9 6.9 2.3 2.5 14.5 1 0.8 12.9 1 1.2 25.6 0.1 0.3 43.7 0.1 0.1 42.7 0.5 0.6 20 0.3 0.2 39.5
Rural 65 65.7 14.4 2.2 2 12.6 2.4 2.8 13.5 0.9 0.9 9.9 1.1 1.3 32.8 0.2 0.4 54.9 0 0.1 63.3 0.5 0.6 22.8 0.3 0.2 45.1
Pacific Urban 62.5 69.8 28.6 2.1 2 10.6 2.4 2.6 16.4 0.9 0.7 18.4 1 1.3 34 0.2 0.3 50.6 0.1 0.1 47.2 0.5 0.6 24.3 0.3 0.2 47.7
Suburban 77.5 89.2 16.4 2.3 2.1 11.2 2.3 2.6 13.5 0.9 0.8 12.2 0.9 1.3 40 0.2 0.3 78.5 0.1 0.1 41.5 0.5 0.6 25.2 0.3 0.2 38.2
Rural 73.1 84.8 18.6 2.5 2.2 9.8 2.5 2.8 10 0.9 0.8 13.3 1 1.3 24.4 0.2 0.4 49.9 0 0.1 42.7 0.5 0.7 13 0.3 0.2 47.8

NOTE: MAPE = Median absolute percent error. Absolute percent difference between NHTS data value and ACS data value calculated for each Census tract. Median of differences for each Census region/division and urban group calculated to find the MAPE.

States included by Census Region: Northeast = NY (excluding Census tracts in Manhattan), VT; Midwest = IN, IA, NE, SD; South Atlantic = FL, GA, NC, SC, VA; East South Central and West South Central = AL, TN, TX; Mountain = AZ; Pacific = CA

Table B7. Comparison of Means for Sample Used in Validating Models to Predict Vehicle Miles (continued)

Census Region/ Division Urban Group Median Census Tract Value Median Census Tract Value Median Census Tract Value
Household Income (Thousands) Count of Household Vehicles Count of Household Members Count of Workers in Household Homeowner (Percent) 1+ Child < 18 (Percent) 1 Person Household, <65 2+ Person Household, 0 65+ (Percent) 2+ Person household, 1+ 65+ (Percent)
NHTS ACS MAPE ACS v. NHTS NHTS ACS MAPE ACS v. NHTS NHTS ACS MAPE ACS v. NHTS NHTS ACS MAPE ACS v. NHTS NHTS ACS MAPE ACS v. NHTS NHTS ACS MAPE ACS v. NHTS NHTS ACS MAPE ACS v. NHTS NHTS ACS MAPE ACS v. NHTS NHTS ACS MAPE ACS v. NHTS
Northeast Urban 47.5 50.4 34.4 1.7 1.6 11.1 2.2 2.3 15.5 0.8 0.7 15.1 0.9 1.2 25.8 0.2 0.3 52.8 0.1 0.2 50.6 0.5 0.6 20.8 0.2 0.1 41
Suburban 67.5 15.3 19.4 2 1.9 13.4 2.5 2.6 10.1 0.9 0.8 15 1 1.3 25.3 0.2 0.4 64.6 0.1 0.1 37.7 0.5 0.6 22 0.3 0.1 42.5
Rural 57.5 13.4 20.5 2.2 2 11.1 2.4 2.5 11.2 0.9 0.8 10.1 1.1 1.3 22.5 0.2 0.3 56.8 0.1 0.1 41.2 0.6 0.6 22.1 0.2 0.2 41.5
Midwest Urban 47.5 10.2 16.3 2.1 1.8 14.5 2.4 2.4 7.8 0.9 0.7 22.3 1.2 1.3 19.4 0.2 0.3 51.4 0.1 0.2 38.3 0.5 0.6 23.2 0.2 0.1 61.1
Suburban 57.5 13.5 15 2.2 1.9 11.6 2.4 2.4 8.8 0.9 0.8 16.5 1.1 1.2 12.9 0.2 0.3 73.4 0.1 0.2 90.6 0.5 0.6 15.7 0.2 0.1 41.8
Rural 67.5 12.6 12.8 2.5 2.2 8.9 2.8 2.7 13.6 0.9 0.9 9.6 1.3 1.5 13.3 0.3 0.4 55.1 0.1 0.1 42.2 0.7 0.7 16.5 0.2 0.1 36.3
South Atlantic Urban 47.5 12.2 15.6 1.9 1.7 13.1 2.2 2.5 15.1 0.9 0.7 22.9 0.9 1.2 37.5 0.1 0.3 81.8 0.1 0.2 41.9 0.4 0.5 17.9 0.3 0.1 46.5
Suburban 57.5 12.2 19.1 2.1 1.9 11.2 2.3 2.5 11.3 0.9 0.8 16.3 0.9 1.2 28.4 0.2 0.3 75.3 0.1 0.2 41.9 0.5 0.6 21.9 0.3 0.2 47.8
Rural 47.5 11.8 18.6 2.3 2.1 11.9 2.4 2.6 12.6 1 0.8 13.3 0.9 1.2 28.9 0.2 0.3 80.6 0.1 0.1 48.6 0.5 0.6 21.4 0.3 0.2 46.4
East South Central and West South Central Urban 68.8 12.2 20 2 1.9 13.4 2.4 2.7 16.4 1 0.8 18.1 1.1 1.4 23.5 0.2 0.4 76.9 0.1 0.1 38 0.6 0.6 20.1 0.3 0.1 52.7
Suburban 90 8.7 21.9 2.3 2 13.8 2.8 3 12.2 1 0.8 14.4 1.2 1.4 20.6 0.3 0.5 47.8 0 0.1 45.2 0.7 0.7 11.2 0.2 0.1 52.2
Rural 72.5 10.4 19.2 2.2 2.1 10.4 2.5 2.9 17.3 1 0.9 11.8 1 1.4 34.4 0.2 0.4 79.8 0.1 0.1 34.8 0.6 0.7 15.1 0.2 0.1 45.2
Mountain Urban 47.5 10.4 18.2 1.8 1.6 13.1 2.1 2.5 20.5 0.9 0.7 25.6 0.9 1.3 46.6 0.1 0.3 74.5 0.1 0.2 42.9 0.4 0.5 33.1 0.3 0.1 53.9
Suburban 66.3 9.2 18 2 1.9 7.7 2.3 2.5 14.5 1 0.8 11.9 0.9 1.2 27.8 0.1 0.3 40.6 0.1 0.1 39.8 0.5 0.5 18.5 0.3 0.2 40.7
Rural 65 14.9 13.8 2.2 2 12.1 2.4 2.8 12.7 0.9 0.9 10.2 1.1 1.3 32.6 0.2 0.4 48.4 0 0.1 63.3 0.5 0.6 20 0.4 0.2 43.6
Pacific Urban 62.5 15.1 28.6 2.1 2 10.6 2.4 2.7 16.4 0.9 0.7 19.6 1 1.3 34.5 0.2 0.3 46.9 0.1 0.1 48.5 0.5 0.6 24.1 0.3 0.2 47.6
Suburban 77.5 12.2 16.4 2.3 2.1 10.9 2.2 2.6 14.3 0.9 0.8 12.2 0.9 1.3 44.2 0.1 0.3 81.2 0.1 0.1 35.2 0.4 0.6 26.9 0.3 0.2 38.9
Rural 72.5 10.6 19 2.5 2.2 9.6 2.5 2.8 10.5 0.9 0.8 13.4 1 1.3 25.5 0.2 0.4 49 0 0.1 42.7 0.5 0.7 14.3 0.3 0.2 47

NOTE: MAPE = Median absolute percent error. Absolute percent difference between NHTS data value and ACS data value calculated for each Census tract. Median of differences for each Census region/division and urban group calculated to find the MAPE.

States included by Census Region: Northeast = NY (excluding Census tracts in Manhattan), VT; Midwest = IN, IA, NE, SD; South Atlantic = FL, GA, NC, SC, VA; East South Central and West South Central = AL, TN, TX; Mountain = AZ; Pacific = CA

Table B8. Comparison of Means for Sample Used in Validating Models to Predict Vehicle Trips (continued)

Census Region/ Division Urban Group Median Census Tract Value Median Census Tract Value Median Census Tract Value
Household Income (Thousands) Count of Household Vehicles Count of Household Members Count of Workers in Household Homeowner (Percent) 1+ Child < 18 (Percent) 1 Person Household, <65 2+ Person Household, 0 65+ (Percent) 2+ Person household, 1+ 65+ (Percent)
NHTS ACS MAPE ACS v. NHTS NHTS ACS MAPE ACS v. NHTS NHTS ACS MAPE ACS v. NHTS NHTS ACS MAPE ACS v. NHTS NHTS ACS MAPE ACS v. NHTS NHTS ACS MAPE ACS v. NHTS NHTS ACS MAPE ACS v. NHTS NHTS ACS MAPE ACS v. NHTS NHTS ACS MAPE ACS v. NHTS
Northeast Urban 47.5 50.9 34.2 1.7 1.6 11.4 2.2 2.4 16 0.8 0.7 14.1 0.9 1.2 27.9 0.2 0.3 42.8 0.1 0.2 50 0.5 0.6 19.9 0.2 0.1 42.2
Suburban 67.5 75.5 18.7 2 1.9 13.4 2.5 2.6 10 0.9 0.8 15.3 1 1.3 25.8 0.2 0.4 73.6 0.1 0.1 38.9 0.5 0.6 22 0.2 0.1 42.9
Rural 57.5 60.8 20.4 2.1 2 10.4 2.4 2.5 11.1 0.9 0.8 10.1 1.1 1.3 22.8 0.2 0.3 53.4 0.1 0.1 38.5 0.6 0.6 21.3 0.2 0.2 43
Midwest Urban 47.5 51.1 16.2 2.1 1.8 15.4 2.2 2.4 8.2 0.9 0.7 22.5 1.2 1.3 19.8 0.1 0.3 64.5 0.1 0.2 34.1 0.5 0.6 23.3 0.2 0.1 60.4
Suburban 62.5 55.1 14.6 2.2 1.9 12 2.4 2.4 8.8 0.9 0.8 16.7 1.1 1.2 14.8 0.2 0.3 73.4 0.1 0.2 94.8 0.6 0.6 15.7 0.2 0.1 41.3
Rural 67.5 69.3 13.5 2.5 2.2 9.5 2.8 2.7 13.6 0.9 0.9 9.8 1.3 1.5 13.8 0.3 0.4 56 0.1 0.1 42.2 0.7 0.7 15.6 0.2 0.1 36.3
South Atlantic Urban 47.5 52.1 15.6 1.9 1.7 12.3 2.2 2.5 14.9 0.9 0.7 22.6 0.8 1.2 35.3 0.1 0.3 83.7 0.1 0.2 38.9 0.4 0.5 17.6 0.3 0.1 46.2
Suburban 57.5 57.3 19.1 2.1 1.9 11.5 2.3 2.5 11.4 0.9 0.8 16.1 0.9 1.2 27.7 0.2 0.3 75.6 0.1 0.2 41.9 0.5 0.6 22.2 0.3 0.2 47.6
Rural 47.5 50.6 19 2.3 2.1 11.6 2.4 2.6 12.5 1 0.8 13.3 0.9 1.2 29.5 0.2 0.3 80.6 0.1 0.1 49.7 0.5 0.6 21.2 0.3 0.2 46.3
East South Central and West South Central Urban 68.8 66.2 21.4 2.1 1.9 13.1 2.4 2.7 16.4 1 0.8 18.6 1.1 1.4 25 0.1 0.4 88.9 0.1 0.1 40.6 0.6 0.6 20.1 0.3 0.1 52.9
Suburban 90 81.4 21.6 2.3 2 13.4 2.7 3 12.3 1 0.8 14.2 1.2 1.4 19.4 0.3 0.4 50.4 0 0.1 39.3 0.7 0.7 11.5 0.2 0.1 50.8
Rural 70 68.5 18.3 2.2 2.1 9.8 2.5 2.9 17.5 1 0.9 11 1 1.4 34.4 0.2 0.4 84.7 0.1 0.1 34.2 0.6 0.7 17 0.2 0.1 44.8
Mountain Urban 50 48.6 19.5 1.7 1.7 12 2.1 2.5 20.9 0.9 0.7 24.8 0.9 1.3 44.9 0.1 0.3 73.8 0.1 0.2 60.5 0.4 0.5 32.5 0.3 0.1 52.1
Suburban 67.5 71.3 16.4 2 1.9 6.9 2.3 2.5 14.5 1 0.8 12.9 1 1.2 25.6 0.1 0.3 43.7 0.1 0.1 42.7 0.5 0.6 20 0.3 0.2 39.5
Rural 65 65.7 13.3 2.3 2 12.6 2.4 2.8 12.6 0.9 0.9 9.9 1.1 1.3 32.5 0.2 0.4 49.5 0 0.1 63.3 0.5 0.6 22.6 0.3 0.2 45.1
Pacific Urban 62.5 69.8 28.3 2.1 2 11.3 2.4 2.7 16.2 0.9 0.7 18.7 1 1.3 33.3 0.2 0.3 48.9 0.1 0.1 48.5 0.5 0.6 24.3 0.3 0.2 47.7
Suburban 77.5 89.2 16.4 2.3 2.1 11.2 2.3 2.6 13.5 0.9 0.8 12.2 0.9 1.3 40 0.2 0.3 78.5 0.1 0.1 41.5 0.5 0.6 25.2 0.3 0.2 38.2
Rural 73.8 84.8 19 2.5 2.2 9.6 2.5 2.8 10.4 0.9 0.8 13.6 1 1.3 25.5 0.2 0.4 49 0 0.1 42.7 0.5 0.7 13.4 0.3 0.2 47

NOTE: MAPE = Median absolute percent error. Absolute percent difference between NHTS data value and ACS data value calculated for each Census tract. Median of differences for each Census region/division and urban group calculated to find the MAPE.

States included by Census Region: Northeast = NY (excluding Census tracts in Manhattan), VT; Midwest = IN, IA, NE, SD; South Atlantic = FL, GA, NC, SC, VA; East South Central and West South Central = AL, TN, TX; Mountain = AZ; Pacific = CA