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 I. The theory of atributes

Collection:: Economics Books

THEORY OF STATISTICS. Here the important question is, How far does inoculation protect from attack? The most natural comparison is therefore— Percentage of inoculated who were not attacked . 98:9 z not inoculated ow LLB or we might tabulate the complementary proportions— Percentage of inoculated who were attacked . aide] 2 not inoculated . a . a J 92 Either comparison brings out simply and clearly the fact that inoculation and exemption from attack are positively associated (inoculation and attack negatively associated). We are making above a comparison by rows in the notation of the table on p. 26, comparing (4B)/(4) with (aB)/(a), or (48)/(4) with (af)/(a). A comparison by columns, ¢g. (4B)/(B) with (4B)/(B), would serve equally to indicate whether there was any appreciable association, but would not answer directly the particular question we have in mind :— Percentage of not-attacked who were inoculated . 30:8 ps attacked ¥ py ; . 43 Example vi—Deaf-mutism and Imbecility. (Material from Census of 1901. Summary Tables. [Cd. 1523.]) Total population of England and Wales . . 32,528,000 Number of the imbecile (or feeble-minded) x 48,882 Number of deaf-mutes . ‘ : : 15,246 Number of imbecile deaf-mutes 451 Required, to find whether deaf-mutism is associated with imbecility. We may denote the number of the imbecile by (4), of deaf- mutes by (B). A comparison of (4B)/(B) with (4)/N or of (AB)/(4) with (B)/N may very well be used in this case, seeing that (4)/N and (B)/N are both small. The question whether to give the preference to the first or the second comparison depends on the nature of the investigation we wish to make. If it is desired to exhibit the conditions among deaf-mutes the first may be used :— Proportion of imbeciles among deaf- = AEE) }20 6 per thousand. Proportion of imbeciles in the whole 1'5 population = (4)/& . : : 32 29

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