期刊
CHEMOMETRICS AND INTELLIGENT LABORATORY SYSTEMS
卷 60, 期 1-2, 页码 265-281出版社
ELSEVIER
DOI: 10.1016/S0169-7439(01)00201-5
关键词
multivariate analysis; groundwater; nondetects
Principal components analysis (PCA) is used to evaluate similarities in the trace element chemistry of groundwaters. Many of the trace elements, however, occur at concentrations below the detection limits (DL), which presents problems for statistical analyses. Since the optimal methods for dealing with the '
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