The RAS method is a well-known method for data reconciliation. Its aim is to achieve consistency between the entries of some nonnegative matrix and pre-specified row and column totals.
The method was devised in a time when powerful computers were not available. It is very easy to apply and to understand. However, it has a narrow scope of applicability. It can only be applied to nonnegative matrices. Mathematically, the method is an iterative scaling method.
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