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Analysis of the hominoid os coxae by Cartesian coordinates
Author(s) -
McHenry Henry M.,
Corruccini Robert S.
Publication year - 1978
Publication title -
american journal of physical anthropology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.146
H-Index - 119
eISSN - 1096-8644
pISSN - 0002-9483
DOI - 10.1002/ajpa.1330480216
Subject(s) - gorilla , homo sapiens , cartesian coordinate system , principal component analysis , extant taxon , standard deviation , biology , position (finance) , mathematics , paleontology , evolutionary biology , statistics , geometry , geography , archaeology , finance , economics
This study is based upon 48 3‐dimensional coordinates taken on 4 fossil hominid and 127 extant hominoid coxal bones. The fossils include Sts 14, SK 3155, MLD 7, and MLD 25. The comparative sample consists of 42 Homo sapiens , 27 Pan troglodytes , 29 Gorilla gorilla and 29 Pongo pygmaeus . The coordinates improve the metrical representation of the bone beyond what can be done with linear measurements because the shape complexity of the os coxae is so great. The coordinates are rotated and translated so that all bones are in a standard position. The coordinates are then standardized for each specimen by dividing all coordinates by the pooled standard deviation of X, Y, and Z coordinates. These data are treated to standard statistical analyses including analysis of variance, Penrose size and shape statistics, principal coordinates and components, and canonical variates analysis. The data are then further altered by using some specimen as a standard and rotating each specimen until the total squared distance between its coordinates and those of the standard are minimized. The same statistics are applied to these “best fit” data. The results show a high degree of agreement between the methods. The hominid os coxae are fundamentally different from the other hominoids and the fossil hominids share the basic hominid configuration but with some unique differences.