An Introduction to the theory of statistics

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Monograph

Identifikator:: 1751730271

URN:: urn:nbn:de:zbw-retromon-127610

Document type:: Monograph

Author:: Yule, George Udny http://d-nb.info/gnd/12910504X

Title:: An Introduction to the theory of statistics

Edition:: 8. ed. rev

Place of publication:: London

Publisher:: Griffin

Year of publication:: 1927

Scope:: XV, 422 S; Ill., Diagr

Digitisation:: 2021

Collection:: Economics Books

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Document type:: Monograph

Structure type:: Chapter

Title:: Part II. The theory of variables

Collection:: Economics Books

Te THEORY OF STATISTICS. effect of the varying age at marriage must be estimated afterwards. 10. But the correlation between (1) number of children of a woman and (2) number of children of her daughter will be further affected according as we include in the record all her available daughters or only one. Suppose, e.g., the number of children in the first generation is 5 (say the mother and her brothers and sisters), and that she has three daughters with 0, 2, and 4 children respectively: are we to enter all three pairs (5, 0), (5, 2), (5, 4) in the correlation-table, or only one pair? If the latter, which pair? For theoretical simplicity the second process is distinctly the best (though it still further limits the available data). Ifit be adopted, some regular rule will have to be made for the selection of the daughter whose fertility shall be entered in the table, so as to avoid bias: the first daughter married for whom data are given, and who fulfils the conditions as to duration of marriage, may, for instance, be taken in every case. (For a much more detailed discussion of the problem, and the allied problems regarding the inheritance of fertility in the horse, the student is referred to the original.) 11. Illustration iii. —The subject for investigation is the relation between the bulk of a crop (wheat and other cereals, turnips and other root crops, hay, etc.), and the weather. (Cf. Hooker, ref. 7.) Produce-statistics for the more important crops of Great Britain have been issued by the Board of Agriculture since 1885: the figures are based on estimates of the yield furnished by official local estimators all over the country. Estimates are published for separate counties and for groups of counties (divisions). But the climatic conditions vary so much over the United Kingdom that it is better to deal with a smaller area, more homogeneous from the meteorological standpoint. On the other hand, the area should not be too small; it should be large enough to present a representative variety of soil. The group of eastern counties, consisting of Lincoln, Hunts, Cambridge, Norfolk, Suffolk, Essex, Bedford, and Hertford, was selected as fulfilling these conditions. The group includes the county with the largest acreage of each of the ten crops investigated, with the single exception of permanent grass. 12. The produce of a crop is dependent on the weather of a long preceding period, and it is naturally desired to find the influence of the weather at all successive stages during this period, and to determine, for each crop, which period of the year is of most critical importance as regards weather. It must be remembered, however, that the times of both sowing and 196

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