TABLE 1 Categories Used for Selected Trip Purpose Distributions

TABLE 1 Categories Used for Selected Trip Purpose Distributions

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Trip purpose Categorization scheme Mean Standard deviation GLM results
Home-work 0 workers 0 0 F = 3,228
1 worker, 0-1 vehicles 1.29 1.05 df = 9
1 worker, 2+ vehicles 1.45 1.09 R 2 = 0.489
2 workers, 0 children (0-4), 0 children (5-17) 2.78 1.56  
2 workers, 0 children (0-4), 1+ children (5-17) 2.56 1.56  
2 workers, 1+ children (0-4), 0 children (5-17) 2.14 1.40  
2 workers, 1+ children (0-4), 1+ children (5-17) 2.32 1.39  
3 workers, 0 children (5-17) 4.12 2.05  
3 workers, 1+ children (5-17) 3.75 1.94  
4 + workers 5.56 2.41  
Home-school 0 children (5-17) 0 0 F = 14,039
1 children (5-17) 1.30 0.90 df = 4
2 children (5-17) 2.73 1.50 R 2 = 0.704
3 children (5-17) 4.16 2.17  
4+ children (5-17) 5.46 3.02  
Home-other 1 person, 0 workers, 0 vehicles 1.06 1.36 F = 871
1 person, 0 workers, 1+ vehicles 1.92 1.87 df = 15
1 person, 1 worker 1.11 1.42 R 2 = 0.300
2 persons, 0-1 workers, 0 vehicles 1.90 2.03  
2 persons, 0 workers, 1+ vehicles 3.68 3.01  
2 persons, 1 worker, 1+ vehicles 2.93 2.66  
2 persons, 2 workers 2.09 2.16  
3 persons, 1-2 children (0-4) 2.59 2.18  
3 persons, 0 children (5-17), 0 children (0-4) 3.70 3.25  
3 persons, 1-2 children (5-17), 0 children (0-4) 4.67 3.50  
4 persons, 0-1 children (5-17), 0-1 children (0-4) 5.08 3.49  
4 persons, 0-1 children (5-17), 2-3 children (0-4) 2.88 2.38  
4 persons, 2+ children (5-17) 6.83 4.81  
5+ persons, 0-1 children (5-17) 5.63 4.21  
5+ persons, 2 children (5-17) 7.39 5.09  
5+ persons, 3+ children (5-17) 9.16 6.29  

Key: GLM = generalized linear modeling; F = F-statistic to test the null hypothesis of equal means; df = degrees of freedom; R 2 = proportion of variance explained by the schemes (within group sum-of-squares/total sum-of-squares).

Note: Trip rates shown are for those categories in the NPTS sample.