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Abstract
A Systamatic method for carrying out tests of parallelism, concurrence or coincidence of multiple regressions, on several sets of data, is described. The method well lends itself to conversational mode operation of a modern computer. It essence lies in the observation that a symbolic repreessentation of the model, under some hypothesis, can be interpreted also as a sequence of matrix operations. resulting in the normal equations which corrrespond to the model.