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The matrices involved in a linear least squares formulation are determined for the problem of fitting piecewise cubic functions, those possessing a continuous derivative, to arrays of planar data.
Lead poisoning remains an important, yet entirely preventable, disease among children worldwide. Children's blood lead levels (BLLs) have been declining in the United States; however, nearly half a million children have BLLs > or = 10 microg/ dl, the level targeted for elimination by 2010. Attainment of this national goal will require translating knowledge… (More)