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Log-ratio approach in curve fitting for concentration-response experiments

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Abstract

The assessment of the ecological risk of chemical contamination by pollutants, pesticides or toxicants is of primary interest in environmental statistics. Concentration-response models play a fundamental role in computing the risk values connected with some exposure levels of a particular contaminant in living organisms. The present paper proposes a regression model called simplicial regression. This model is able to cope with the relative character of the explanatory and response parts via the logratio methodology of compositional data. Consequently, it allows performance of the corresponding statistical inference under the assumption of normality. Some real-world examples show that simplicial regression even outperforms the existing well-established methodologies on standard accuracy and quality-of-fit criteria. The better fit is due to the change of scale entailed by the new model.

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Acknowledgments

Research partially financially supported by the Italian Ministry of University and Research, FAR (Fondi di Ateneo per la Ricerca) 2011. The authors also gratefully acknowledge the support of both the Operational Program Education for Competitiveness—European Social Fund (Project CZ.1.07/2.3.00/20.0170 of the Ministry of Education, Youth and Sports of the Czech Republic) and the grant IGA_PrF_2014_028 Mathematical Models of the Internal Grant Agency of the Palacký University in Olomouc. The authors are grateful to Professor Marco Vighi who has kindly permitted the elaboration of the Vibrio fischeri (Beijerinck) data set.

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Correspondence to Gianna S. Monti.

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Handling Editor: Bryan F. J. Manly.

Appendix: Supporting information

Appendix: Supporting information

Supplementary data associated with this article concern other non-polar and polar narcotics datasets.

See Figs. 3, 4, 5 and 6 and Tables 7, 8, 9, 10, 11 and 12.

Fig. 3
figure 3

Fitting comparison for Butylacetate compound

Fig. 4
figure 4

Fitting comparison for the Diethylether compound

Fig. 5
figure 5

Fitting comparison for the Metoxyaniline 4 compound

Fig. 6
figure 6

Fitting comparison for the Phenylendiammine compound

Table 7 Goodness of fit measures and DEV measure after CV for different regression models in the case of Butylacetate compound
Table 8 Measures of accuracy after CV and goodness of fit measures for different regression models in the case of Diethylether compound
Table 9 Effective log-concentrations resulting from the best-fit and simplicial regression models with the corresponding confidence intervals at 0.95 confidence level for non-polar narcotics
Table 10 Measures of accuracy after CV and goodness of fit measures for different regression models in the case of Metoxyaniline 4 compound
Table 11 Measures of accuracy after CV and goodness of fit measures for different regression models in the case of Phenylendiammine compound
Table 12 Effective log-concentrations resulting from the best-fit and simplicial regression models with the corresponding confidence intervals at 0.95 confidence level for polar narcotics

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Monti, G.S., Migliorati, S., Hron, K. et al. Log-ratio approach in curve fitting for concentration-response experiments. Environ Ecol Stat 22, 275–295 (2015). https://doi.org/10.1007/s10651-014-0298-z

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  • DOI: https://doi.org/10.1007/s10651-014-0298-z

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