Blumenberg B
Am J Phys Anthropol. 1985 Oct;68(2):269-79. doi: 10.1002/ajpa.1330680214.
Distribution and variation statistics of hominid endocranial volume (ECV) have been investigated. Within the interpretative constraints imposed by (very) small sample sizes, the requirements for normality are met, as are those for heteroscedasticity. A significant difference in means can be demonstrated for only two comparisons. With one exception, overall distribution characteristics differ significantly in pairwise comparisons between taxa. The coefficient of variation of ECV that characterizes a group composed of all Plio-Pleistocene gracile hominids does not support a single polytypic species interpretation of this assemblage. Significant differences in the coefficient of variation exist between all possible pairs of taxa with the exception of Homo habilis and Homo erectus.
已对人类颅内体积（ECV）的分布和变异统计进行了研究。在（非常）小样本量所带来的解释性限制范围内，符合正态性要求，异方差性要求也同样符合。仅在两组比较中能证明均值存在显著差异。除了一个例外，在不同分类单元的两两比较中，总体分布特征存在显著差异。表征所有上新世 - 更新世纤细型人类组成群体的ECV变异系数并不支持对该组合进行单一多型物种的解释。除能人（Homo habilis）和直立人（Homo erectus）外，在所有可能的分类单元对之间，变异系数均存在显著差异。
