A COMPARISON OF ASSOCIATION INDEXES
A COMPARISON OF ASSOCIATION INDEXES
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DOI：
10.1016/s0003-3472(87)80018-0
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发表时间：
1987-10-01
期刊：
影响因子：
2.5
通讯作者：
SCHWAGER, SJ
中科院分区：
文献类型：
--
作者：
CAIRNS, SJ;SCHWAGER, SJ
用于衡量裂变/融合社会中个体间关联频率的指标，经常从物种关联的生态学研究中借用，但没有充分的理由。在本文中，在动物行为的实地研究中可能遇到的特定条件下，研究了几个这样的指标。在文献中常见的三个指标中的每一个都是通过模拟显示在可能的抽样偏差的狭窄范围内是准确的。作为一种替代方法，给出了基于两个简单模型的最大似然估计的推导示例。两种模型都假设现有子群的定位比例是恒定的。在第一个模型中，子组的所有组合被定位的可能性是相等的，而在第二个模型中，一个子组的定位概率允许不同于其他子组的定位概率。在模型的假设下，最大似然估计量的偏差较小，方差低于其他三个指标。
Indices used to measure the frequency of association between individuals in fission/fusion societies are frequently borrowed from ecological studies of species association without adequate justification. In this paper several such indices, under specific conditions likely to be encountered in field studies of animal behavior, are examined. Each of three indices commonly found in the literature is shown through simulations to be accurate over only a narrow range of possible sampling biases. As an alternative approach, examples are given of the derivation of a maximum-likelihood estimator based on two simple models. Both models assume that a constant proportion of existing subgroups is located. In the first model all combinations of subgroups are equally likely to be located, while in the second model the probability of locating one subgroup is allowed to differ from that of the others. The maximum-likelihood estimators are shown to be less biased and to have lower variance than the other three indices under the assumptions of the models.