In developing the school travel model, we eliminated the 217 students who live outside of their school district boundary or are missing variable information, yielding a sample of 1216 used for model calculated distance to school as the shortest road network travel distance, using ArcGIS . We weighted the travel survey sample against the Census 2000 population residing in the school district, accounting for differences in race and income (MetroGIS DataFinder, 2009). Weight- ing to census data rather than specifically to the school population is imperfect, but is the best approach available (household income data are not available for the Roseville Area School District) (Kennedy, 2007; Saint.
