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首页> 外文期刊>Journal of Geochemical Exploration: Journal of the Association of Exploration Geochemists >Compositional methods for estimating elemental concentrations below the limit of detection in practice using R
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Compositional methods for estimating elemental concentrations below the limit of detection in practice using R

机译:实际使用R估算低于检测极限的元素浓度的组成方法

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摘要

Geochemical studies typically generate data sets including labels for values below certain limits of detection of the analytical techniques involved. These unobserved values hamper subsequent data analysis, and a number of procedures with different levels of sophistication have been introduced in order to deal with them. Unfortunately, those most commonly used in practice are those most prone to introduce bias and lead to poor estimates of the statistics of interest. We approach this topic in the context of geochemical compositional data, that is, data representing parts of a whole. Although the general statistical literature has provided well-based methods for censored data, which includes the case of nondetects, they have ignored the special nature of-compositional samples. In this paper we review a number of methods introduced in the recent years to deal with values below the detection limit while meeting compositional principles. We provide guidance and computer routines to easily apply them in practice using the popular R statistical computing language.
机译:地球化学研究通常会生成包括标签的数据集,这些标签的值低于所涉及分析技术的检测限。这些无法观测的值妨碍了后续的数据分析,并且为了处理它们,引入了许多具有不同复杂程度的过程。不幸的是,在实践中最常用的是那些最容易引入偏见并导致对感兴趣的统计数据的估计不足的人。我们在地球化学组成数据(即表示整体部分的数据)的背景下处理此主题。尽管一般的统计文献提供了针对检查数据的良好方法,包括未检测到的情况,但他们忽略了组成样本的特殊性质。在本文中,我们回顾了近年来引入的许多方法,这些方法可以在满足组成原理的情况下处理低于检测限的值。我们提供了指导和计算机例程,以便使用流行的R统计计算语言轻松地将其实际应用。

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