Bidmos Mubarak A, Dayal Manisha R
School of Anatomical Sciences, Faculty of Health Sciences, University of the Witwatersrand, 7 York Road, Parktown, 2193, Johannesburg, South Africa.
J Forensic Sci. 2004 Nov;49(6):1165-70.
Several studies have shown that osteometric differences exist between different population groups. Thus, discriminant function equations derived for the determination of sex from skeletal elements are population specific. In a previous study, the authors derived such equations from nine measurements of the talus of South African whites with high levels of average accuracies. The validity of some of the equations was tested on data collected from a South African black sample that consisted of 120 tali, equally distributed by sex, derived from the Raymond A. Dart Collection of Human Skeletons. The average accuracies dropped significantly. This necessitated the derivation of new equations for the South African black population and the average accuracies obtained ranged between 80% and 89%. The validity of the equations derived from the present study was tested using the leave-one-out classification and two independent samples (1 and 2). The applicability of the equations with very high classification rate from the present study was tested on Independent sample 1 of 10 white tali with poor results. The result of the validity of these equations on an Independent sample 2 of 10 black tali revealed acceptably high average accuracies in correct classification thereby supporting earlier observations on population specificity of discriminant function equations.
多项研究表明，不同人群组之间存在骨测量差异。因此，从骨骼元素确定性别的判别函数方程是特定于人群的。在先前的一项研究中，作者从南非白人距骨的九项测量中得出了此类方程，平均准确率较高。部分方程的有效性在从雷蒙德·A·达特人类骨骼收藏中获取的120块距骨组成的南非黑人样本数据上进行了测试，这些距骨按性别平均分布。平均准确率显著下降。这就需要为南非黑人人群推导新的方程，得到的平均准确率在80%至89%之间。使用留一法分类和两个独立样本（1和2）对本研究得出的方程的有效性进行了测试。本研究中分类率非常高的方程在10块白人距骨的独立样本1上的适用性测试结果不佳。这些方程在10块黑人距骨的独立样本2上的有效性结果显示，正确分类的平均准确率高得可以接受，从而支持了关于判别函数方程人群特异性的早期观察结果。
