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- Title
Log-ratio approach in curve fitting for concentration-response experiments.
- Authors
Monti, Gianna; Migliorati, Sonia; Hron, Karel; Hrůzová, Klára; Fišerová, Eva
- 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.
- Subjects
ECOLOGICAL risk assessment; POLLUTANTS; INFERENTIAL statistics; REGRESSION analysis; EUROPEAN Food Safety Authority
- Publication
Environmental & Ecological Statistics, 2015, Vol 22, Issue 2, p275
- ISSN
1352-8505
- Publication type
Article
- DOI
10.1007/s10651-014-0298-z