Excerpt from Elements of Statistics

This book was first published in 1901, and was then based on lectures delivered at the School of Economics in the'five years following its foundation in 1895. Two further editions have been issued in which the text was revised without any important alteration, and an Appendix added dealing with the second approximation to the normal curve of error, and sub sequently some pages of addenda were circulated. In the present edition Part I remains substantially as it was in 1901, except that Section III of Chapter III has been replaced by a new illustration, the chapter on Averages has been rearranged, a chapter on the measurement of dispersion takes the place of the former Chapter V, in Chapter IX the treatment of retail index-numbers has been reconsidered, and the second section of Chapter X has been recast. At the same time those parts of the text which were out of date have been replaced by more modern material and the whole has been revised, but with as little alteration of the original as possible, since a revised version may by too much attention to detail destroy the balance of the original. On the other hand, Part II has been completely rewritten and considerably extended, both by the more detailed and extended treatment of theory and by the addition of a number of examples which illustrate the arithmetical use of the formulae and Show the scope of the application of the theory. For the convenience of those who possess the earlier edition, to whom the revised Part I contains little that is new, Part II is issued separately while for those whose mathematical know ledge is too slight to allow them to follow the treatment in Part II in its new form Part I is also issued separately. But the two Parts together are essentially one book with a common index and with cross references from one to another.

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