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Unlike most of the nation, Virginia has a comprehensive system of independent cities and counties. Because our 40 independent cities are estimated as though they were counties, county-level estimates fulfill much of the same function in Virginia that subcounty estimates fulfill in other states. Thus the importance of county estimates in Virginia is enormous, and their accuracy is, of course, crucial. Independent cities and the counties they border also have some unique characteristics that affect the type and quality of data available to produce population estimates, and the data series in turn affect the accuracy of different methods. This paper discusses our past findings in testing estimation models for counties and independent cities, and provides a blueprint of our testing plans for the post-2000 estimates.
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