Precision and reliability in paleocommunity comparisons based on cluster-confidence intervals: How to get more statistical bang for your sampling buck
Precision and reliability in paleocommunity comparisons based on cluster-confidence intervals: How to get more statistical bang for your sampling buck
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DOI：
10.2307/3515400
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发表时间：
1999-10-01
期刊：
影响因子：
1.6
通讯作者：
Rutherford, SD
中科院分区：
文献类型：
--
作者：
Bennington, JB;Rutherford, SD
化石组合的统计学意义的比较可以通过计算集群的置信区间平均物种丰度使用重复批量样品的数据;然而，不同水平的精度和可靠性从集群的置信区间获得取决于如何采样努力是分配时收集重复样品。如果一个地方的物种-多度分布是斑块状的，那么通过在大量的大样本中分配采样努力，可以提高聚类置信区间的精度和可靠性。收集大量样本不会显著增加采样工作量，如果总数！收集的个人数量保持不变。在一个地方的平均物种丰度周围的置信区间（CI）提供了一种方法来评估地方之间观察到的差异的大小，并可用于评估稀有物种的缺乏的意义。来自集群CI的观察到的物种丰度的差异的意义的结论是相似的，使用方差分析（ANOVA）的Clerter-Cls提供了一个强大的和易于应用的工具，用于评估的物种丰度和古群落组成中观察到的化石记录的差异的意义。
Statistically meaningful comparisons of fossil assemblages can be made by calculating cluster-confidence intervals around mean species abundances using data from replicate bulk samples; However, different levels of precision and reliability are obtained fi om cluster-confidence intervals depending on how sampling effort is distributed when collecting replicate samples. If the species-abundance distributions ata locality are patchy, then both the precision and the reliability of cluster-confidence intervals are increased by distributing sampling effort among a larger number of bulk samples. Collecting larger numbers of samples does not significantly increase the sampling effort if the total! number of individuals collected remains the same. Cluster-confidence intervals (CIs) around mean species abundances at a locality provide a way to assess the magnitude of differences observed between localities and can be used to assess the significance of the absence of rare species. Conclusions derived from cluster-CIs regarding the significance of differences in observed species abundances are similar to those obtained using analysis of variance (ANOVA) Cluster-Cls provide a powerful and easily applied tool for assessing the significance of differences in species abundances and paleo-community composition observed in the fossil record.