In 1937, J. Kruithof introduced a scheme for projecting from measured point-to-point teletraffic data to some future values, based upon estimates of total originating and terminating traffic only. This study seeks to give a unified picture of Kruithof's projection method and its generalizations, with some practical details and recommendations for implementation. The main text deals with existence and convergence testing, treatment of ill-conditioned or slowly convergent cases, and various extensions of the basic method. An appendix includes proofs of existence, uniqueness, convergence, and continuity.
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R. S. Krupp (1979) studied this question.
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