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Summary In a recent note Sir Ronald Fisher (1956) has commented upon some tables which were calculated under my direction and first published in Biometrika about seven years ago (Aspin, 1949). Fisher is concerned with what he supposes to be errors in the values given. The object of the present reply is to explain once more what the tables aim to do, and to maintain that there is no justification in Fisher’s criticism.
B. L. Welch (Sun,) studied this question.