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arXiv 2101.12499stat.MEstat.AP
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光谱数据中潜在结构模型的简约贝叶斯因子分析

Parsimonious Bayesian Factor Analysis for modelling latent structures in spectroscopy data

Alessandro Casa, Tom F. O'Callaghan, Thomas Brendan Murphy

摘要:

近年来,随着市场货架上草饲乳制品的日益流行,动物饮食受到越来越多的关注,特别是研究基于牧场的喂养战略对牛奶和乳制品质量的影响。到目前为止,可用于验证草饲乳制品的测试方法有限,因此这些产品很容易受到食品欺诈和掺假的影响。因此,需要统计工具来研究来自不同饲养系统的动物的牛奶样本之间的潜在差异,从而提高产品真实性的安全性。红外光谱技术被广泛用于收集牛奶样品的数据和预测牛奶相关性状。虽然这些数据通常用于预测牛奶的宏观成分的组成,但每个光谱都提供了关于样品的未利用信息的储存库。由于这些数据的高维性和光谱变量之间的关系,对这些数据的解释提出了许多挑战。在这项工作中,我们提出了一个修改的标准因子分析,以诱导一个吝啬的总结光谱数据。该过程将观测映射到低维潜在空间,同时对观测变量进行聚类。该方法指出了数据中可能存在的冗余,有助于理清波长之间的复杂关系。一个灵活的贝叶斯估计过程中提出的模型拟合,提供合理的潜在因素和集群的数量值。该方法适用于牛奶中红外光谱数据从奶牛在不同的牧场和非牧场为基础的饮食,提供准确的建模的数据相关性,聚类的变量和信息之间的差异,从不同的饮食奶牛的牛奶样品。

英文摘要:

In recent years animal diet has been receiving increased attention, in particular examining the impact of pasture-based feeding strategies on the quality of milk and dairy products, in line with the increased prevalence of grass-fed dairy products appearing on market shelves. To date, there are limited testing methods available for the verification of grass-fed dairy therefore these products are susceptible to food fraud and adulteration. Hence statistical tools studying potential differences among milk samples coming from animals on different feeding systems are required, thus providing increased security around the authenticity of the products. Infrared spectroscopy techniques are widely used to collect data on milk samples and to predict milk related traits. While these data are routinely used to predict the composition of the macro components of milk, each spectrum provides a reservoir of unharnessed information about the sample. The interpretation of these data presents a number of challenges due to their high-dimensionality and the relationships amongst the spectral variables. In this work we propose a modification of the standard factor analysis to induce a parsimonious summary of spectroscopic data. The procedure maps the observations into a low-dimensional latent space while simultaneously clustering observed variables. The method indicates possible redundancies in the data and it helps disentangle the complex relationships among the wavelengths. A flexible Bayesian estimation procedure is proposed for model fitting, providing reasonable values for the number of latent factors and clusters. The method is applied on milk mid-infrared spectroscopy data from dairy cows on different pasture and non-pasture based diets, providing accurate modelling of the data correlation, the clustering of variables and information on differences between milk samples from cows on different diets.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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