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Environmental data often include left-censored values reported to be less than some limit of detection (LOD). While simple imputation of a specific value such as LOD/2 is commonly implemented in practice, maximum likelihood methods accounting for censoring provide an alternate way of analyzing such data. Concentration levels of trace metal contaminants in water are typically modeled with normal or lognormal distributions. The corresponding maximum likelihood estimates (MLEs) of means andfatcat:eu34qpzbhngkxchfi2wxanjubq