| Sumario: | The lack of good flow data is a handicap to spatial interaction research, yet many published works provide little evaluation of such data. Good quality flow data should provide spatial coverage at a large scale with small sampling and other error components. Few generally available data series for interregional commodity flows, interregional population migration, and intercity person movement in the United States meet these basic requirements. The data sets of the Bureau of the Census, Department of Transportation, Social Security Administration, and other government agencies do not provide a sound empirical foundation for spatial. interaction analysis at this time.
|
|---|