التفاصيل البيبلوغرافية
| العنوان: |
Migration Space: Doubly Constrained Gravity Model Mapping of Relative Interstate Separation. |
| المؤلفون: |
Plane, David A.1 |
| المصدر: |
Annals of the Association of American Geographers. Jun84, Vol. 74 Issue 2, p244-256. 13p. |
| مصطلحات موضوعية: |
*EMIGRATION & immigration, *INTERNAL migration, *CARTOGRAPHY, *CALIBRATION, *PHYSICAL measurements |
| مصطلحات جغرافية: |
UNITED States |
| مستخلص: |
Absolute physical distances are notoriously bad measures of the relative functional distances that influence the destination choices of U.S. interstate migrants. A novel calibration procedure for doubly constrained gravity models is proposed to map functional relative inter- state separations. Doubly constrained models exactly reproduce observed migrant supplies and migrant demands. Using straight-line distances, however, they poorly reproduce the observed state-to-state patterns of flow. The proposed alternative calibration procedure leaves interstate separations as model outputs rather than model inputs. Distances are chosen to replicate observed flows. These distances define a "migration space" surrounding origin and destination states. [ABSTRACT FROM AUTHOR] |
| قاعدة البيانات: |
Academic Search Index |
