of imports within a state is estimated by assuming that imports to each county are proportional to annual payrolls computed from data in the 1997 County Business Patterns. The accuracy of this assumption is unknown. For discussion of this point, see National Research Council (2004).

The issue of the quality of data used to support fund allocation formula programs is a complicated one; for a broad review of the considerations involved and much more general issues concerning inputs to and use of fund allocation programs, see National Research Council (2003b).

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