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Appendix:
Occupational Matching
Methodology
Accessibility Measure
The authors use a gravity-type accessibility measure that describes the accessibility of residents to jobs. The basic formula used is:
 |
(Equation 1) |
Where:
| AIi |
= |
Accessibility Index for residential zone i. |
| Ej |
= |
Employment - number of workers in zone j. |
| dij |
= |
Distance (in miles) - highway network distances between zonal centroids, for all i-j interzonal pairs less than 45 miles. |
| g |
= |
Empirically derived impedance coefficient, set at -0.35 for commute trips in the San Francisco Bay Area. |
While network highway distances were used for spatial impedance in this study, network travel times could easily be substituted.
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