John Wiley & Sons, Ltd.

MOSAIC_SSD: A new web‐tool for species sensitivity distribution to include censored data by maximum likelihood

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Censored data are seldom taken into account in Species Sensitivity Distribution (SSD) analysis. However, they are found in virtually every dataset and sometimes represent the better part of the data. Stringent recommendations on data quality often entail discarding a lot of this meaningful data, resulting in datasets of reduced size, which lack representativeness of any realistic community. However, it is reasonably simple to include censored data into SSD by using an extension of the standard maximum likelihood method. In this paper, we detail this approach based on the use of the R‐package fitdistrplus, dedicated to the fit of parametric probability distributions. We especially present the new web‐tool MOSAIC_SSD that can fit an SSD on datasets containing any type of data, censored or not. MOSAIC_SSD predicts any Hazardous Concentration (HC) and provides in addition bootstrap confidence intervals on the predictions. Finally, we illustrate the added value of including censored data in SSD taking examples from published data. Environ Toxicol Chem © 2014 SETAC

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