Nixon Kevin C, Carpenter James M
Bailey Hortorium, Cornell University, Ithaca, New York 14853, U.S.A.
Department of Entomology, American Museum of Natural History, Central Park West at 79th Street, New York, New York 10024, U.S.A.
Cladistics. 1993 Dec;9(4):413-426. doi: 10.1111/j.1096-0031.1993.tb00234.x.
Abstract- The relations among polarity, outgroups and rooting are clarified. The "outgroup algorithm" and "outgroup substitution method" are irrelevant forms of relaxed parsimony. They should be discarded in favor of unconstrained, simultaneous analysis of all terminals. A revised outgroup method is described both in text and with a computer-generated flowchart. Lundberg rooting is consistent with cladistic parsimony only under specific circumstances involving hypothetical ancestors. "Both sides seemed convinced that the 'real enemy'is a vicious conspiracy of some kind." Hunter S. Thompson (1979: 145).
摘要——极性、外类群和确定根节点之间的关系得以阐明。“外类群算法”和“外类群替代方法”是宽松简约法的无关形式。应摒弃它们,而采用对所有终端进行无约束的同时分析。文中及通过计算机生成的流程图描述了一种修订后的外类群方法。仅在涉及假设祖先的特定情况下,伦德伯格确定根节点法才与分支简约法一致。“双方似乎都坚信‘真正的敌人’是某种邪恶的阴谋。”亨特·S·汤普森(1979:145)