Thomas C J, Kotze T J, Nash J M
J Biol Buccale. 1986 Sep;14(3):183-6.
One of the variables in a classification of the palatal ruga pattern displayed an unusual bimodal distribution which occurred in 6 population groups. The two sub-groups involved were defined by means of a maximum likelihood estimation procedure, a stepwise discriminant analysis and a jackknife classification procedure. The variables which supported the bimodality were mostly concerned with palatal dimensions and the classifications were all above 50% with the Bushman groups classifying better than the others at 77.8% (left) and 70.8% (right).
在腭皱襞模式分类中的一个变量呈现出不寻常的双峰分布，这种分布出现在6个群体中。所涉及的两个亚组是通过最大似然估计程序、逐步判别分析和刀切法分类程序来定义的。支持双峰性的变量大多与腭部尺寸有关，分类准确率均高于50%，布须曼人群体的分类效果更好，左侧为77.8%，右侧为70.8%。
