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such that o ^ < a^_1 <... < <rj. In all cases the corresponding parameter domain boundaries are easily obtained. Details and extensions of this work are given in two reports available from the author. Its relevance, of course, is to the problem of deciding how many times to difference a series, before attempting to model it. The work was done at Nottingham University.
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Peter W. Jones (1975) studied this question.
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