An Introduction to the theory of statistics

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Monograph

Identifikator:: 1028803753

URN:: urn:nbn:de:zbw-retromon-47137

Document type:: Monograph

Title:: Die hygienischen Verhältnisse der Insel Formosa

Place of publication:: Dresden

Publisher:: [Verlag nicht ermittelbar]

Year of publication:: 1911

Scope:: 1 Online-Ressource (IV, 232 Seiten)

Digitisation:: 2018

Collection:: Economics Books

Usage license:: Get license information via the feedback formular.

Chapter

Document type:: Monograph

Structure type:: Chapter

Title:: 8. Hospitäler

Collection:: Economics Books

THEORY OF STATISTICS. For those exhibiting nerve signs :— Proportion of the dull=(BD/(B) . = 2 =a per cent, og ,, defectively developed who Sel a == 1573 ” For those not exhibiting nerve signs :— Proportion of the dull=(8D)/(8) i =e EES ys Py ,, defectively developed : lla it = Eat The results are extremely striking ; the association between A and D is very high indeed both for the material as a whole (the universe at large) and for those not exhibiting nerve-signs (the B-universe), but it is very small for those who do exhibit nerve- signs (the B-universe). This result does not appear to be in accord with the conclusion of the Report, as we have interpreted it, for the association between A and D in the B-universe should in that case have been very low instead of very high. Example ii.—Eye-colour of grandparent, parent and child. (Material from Sir Francis Galton’s Natural Inheritance (1889), table 20, p. 216. The table only gives particulars for 78 large families with not less than 6 brothers or sisters, so that the material is hardly entirely representative, but serves as a good illustration of the method.) The original data are treated as in Example vii. of the last chapter (p. 33). Denoting a light-eyed child by 4, parent by B, grandparent by C, every possible line of descent is taken into account. Thus, taking the following two lines of the table, Children Parents Grandparents A. a. B. B. C, vy Light-eyed. Ted, Light-eyed. rd, Light-eyed. od 4 5 1 1 1 3 3 4 1 1 4 0 the first would give 4 x 1 x 1 =4 to the class ABC, 4x 1 x 3=12to the class ABy, ¢ to ASC, 12 to 4By, 5 to «BC, 15 to aBy, 5 to aC, and 15 to afy; the second would give 3x1x4=12 to the class ABC, 12 to ABC, 16 to a BC, 16 to aC, and none to the re- mainder. The class-frequencies so derived from the whole table are, (4B0C) 1928 (aBC) 303 (4 By) 596 (a By) 225 (480) 552 (aC) 395 (4B8y) 508 (ay) 501 46

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