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Published online by Cambridge University Press: 07 November 2014
page 478 note * This form gives a positive coefficient and a positive difference (since the first differences in these tables are decreasing), and so signs need not be considered. This is more convenient than the usual form, given in the Introduction, in which the last term is taken as giving coefficients —.01,—02,….—06. Moreover, it is slightly easier to deduct the lower difference from the upper than to use the reverse process.