SIMPER is intended for comparisons among levels of a categorical variable, where the response matrix is expressed as a distance matrix, particularly the Bray-Curtis dissimilarity measure. We will illustrate it using our oak example, and comparing compositions between the three levels of our Grazing factor.

The simper functions performs pairwise comparisons of groups of sampling units and finds the contribution of each species to the average between-group Bray-Curtis dissimilarity. Although …

2019年5月2日 · The simper functions performs pairwise comparisons of groups of sampling units and finds the average contributions of each species to the average overall Bray-Curtis dissimilarity. The function displays most important species for each pair of groups .

The simper functions performs pairwise comparisons of groups of sampling units and finds the contribution of each species to the average between-group Bray-Curtis dissimilarity. Although the method is called “Similarity Percentages”, it really studied dissimilarities instead of …

The simper functions performs pairwise comparisons of groups of sampling units and finds the contribution of each species to the average between-group Bray-Curtis dissimilarity. Although the method is called “Similarity Percentages”, it really studied dissimilarities instead of …

在本文中，我们将介绍如何使用R语言计算相似性百分比。 相似性百分比 (Simper)是一种用于比较两个数据集之间的相似性的统计量。 它基于数据集中各个属性或特征之间的相似度计算得出。 相似性百分比可以衡量两个数据集之间的相似性程度，从而帮助我们发现它们之间的关系和差异。 在计算相似性百分比之前，我们需要先计算各个属性之间的相似度。 常用的相似度计算方法包括欧氏距离、相关系数和余弦相似度等。 假设我们有两个数据集A和B，它们包含n个属性。 我们可 …

2021年3月17日 · 基于不同群落数据拼接出物种有无的观测矩阵，通过相似性百分比分析（SIMPER）可以表征群落间物种组成的差异模式（Empirical SIMPER profile），并识别出导致这种差异的主要物种类群（图1，2）。

2023年11月27日 · I am new to SIMPER and only somewhat understand how the results are to be interpreted (the basics of what each output is). For example, if Spec1 has the highest average species contribution but its p value isn't considered significant, how is this treated for results?

2023年6月26日 · 然后，使用simper()函数进行SIMPER分析，并指定要输出前几个贡献最大的物种数量（这里设为5）： simper.res <- simper(dune, sim.mat, permutations = 9999, top = 5) 其中， permutations 参数指定用于计算p值的置换次数，越高则结果越可靠但计算时间也会更长； top 参 …

The simper functions performs pairwise comparisons of groups of sampling units and finds the contribution of each species to the average between-group Bray-Curtis dissimilarity. Although the method is called simper, it really studied dissimilarities instead of similarities (Clarke 1993).