TABLE 1 Categories Used for Selected Trip Purpose Distributions,,,,
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,R2 = 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,R2 = 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,R2 = 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; R2 = 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.,,,,