Fuzzy clustering of existing chemicals according to their ecotoxicological properties

Friederichs, M.; Fränzle, Otto; Salski, A.

doi:10.1016/0304-3800(95)00009-7

Cited by 35 publications

(12 citation statements)

References 2 publications

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“…In contrast to traditional regression/classification techniques, fuzzy clustering or regression is capable of dealing with probabilities of finding objects belonging to certain classes, instead of classifying with hard limitations (yes/no decisions) (Friederichs et al, 1996). The limiter functions (which have in most cases a sigmoidal shape), may hold all states or values between two extreme assertions.…”

mentioning

confidence: 99%

Guidance Document on the Validation of (Quantitative) Structure-Activity Relationship [(Q)SAR] Models

2014

OECD Series on Testing and Assessment

163

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confidence: 99%

Guidance Document on the Validation of (Quantitative) Structure-Activity Relationship [(Q)SAR] Models

2014

OECD Series on Testing and Assessment

163

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“…These methods are used in many areas of environmental sciences. Among others, they are helpful in e.g., water, air, and soil pollution assessment (e.g., Lehn and Temme 1996;Chang et al 2001;Argiriou et al 2004;Grande et al 2005;Ocampo-Duque et al 2007) or assessment of toxic substances influence on the environment (e.g., Melcher and Matthies 1996;Friedrichs et al 1996;Sârbu and Pop 2000;Salski 2007). …”

Section: Resultsmentioning

confidence: 99%

Assessment of 137Cs and 239,240Pu Distribution in Forest Soils of the Opole Anomaly

Ziembik

Dołhańczuk-Śródka

Komosa

et al. 2009

Water Air Soil Pollut

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Distribution of 137 Cs and 239,240 Pu in the forest soils horizons of the Opole Anomaly was established. Gamma and alpha spectrometry was used for determination of these isotopes. It was found that the 137 Cs activity was approx. 1,000 times higher than that of 239,240 Pu. The highest activities of both radioisotopes were found close to the boundary region in soil profile where the organic horizon turns into the inorganic one. Cluster analysis did not clearly indicate the group's existence in data in respect to 137 Cs and 239,240 Pu activities and organic matter content. Distributions of 137 Cs and 239,240 Pu in soil horizons were non-normal but similar to each other. These distributions were substantially different from that one for organic matter content. The data were separated into two groups, for organic and inorganic soil horizons, respectively. Data transformation using Box-Cox formula was performed following by standardization.Mutual relationships between variables were investigated using ordinary and robust regression methods. Good correlation between 137 Cs and 239,240 Pu was found. No significant relationship between organic matter content and radioisotopes activity was asserted.

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“…The close cooperation of multivariate statistics and Hasse diagram technique becomes evident, when cluster analysis is performed as a preparing step, before representatives of clusters are evaluated and visualized by Hasse diagrams. A publication where the use of fuzzy sets [35] is shown is in preparation [36].…”

Section: Comments To Other Multivariate Visualizationsmentioning

confidence: 99%

Application of the Concept of Partial Order on Comparative Evaluation of Environmental Chemicals

Brüggemann¹,

Bücherl²,

Pudenz

et al. 1999

Acta hydrochim. hydrobiol.

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Fuzzy clustering of existing chemicals according to their ecotoxicological properties

Cited by 35 publications

References 2 publications

Guidance Document on the Validation of (Quantitative) Structure-Activity Relationship [(Q)SAR] Models

Guidance Document on the Validation of (Quantitative) Structure-Activity Relationship [(Q)SAR] Models

Assessment of 137Cs and 239,240Pu Distribution in Forest Soils of the Opole Anomaly

Application of the Concept of Partial Order on Comparative Evaluation of Environmental Chemicals

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