Results 171 to 180 of about 583 (205)

Transformations of Copulas and Quasi-Copulas

2004
Transformations of aggregation operators preserving the class of copulas and quasi-copulas, respectively, are shown to be concave automorphisms of the unit interval. Attractors of copulas are discussed, special attention being paid to power transformations and the relationship between the corresponding attractors and the so-called maximum attractor ...
Erich Peter Klement, Radko Mesiar, Endre Pap   +2 more
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Some new characterizations and properties of quasi-copulas

Fuzzy Sets and Systems, 2009
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Rodríguez-Lallena, José Antonio, Úbeda-Flores, Manuel   +1 more
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Quasi–copulas: a brief survey

2017
This article is a survey of quasi–copulas. The genesis, the history and the properties of quasi–copulas are presented, with special emphasis on their characterisation and on recent results. The presentation will also highlight the key part played by Roger Nelsen in all stages of the development of the theory.
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A note on quasi-copulas and signed measures

Fuzzy Sets and Systems, 2014
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Fernández-Sánchez, Juan, Úbeda-Flores, Manuel   +1 more
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Quasi-Copulas on Discrete Scales

2006
In the paper the structure of quasi-copulas on discrete scales is studied. A special attention is given to the study of quasi-copulas with diagonal section. The cardinality of the set of quasi-copulas on L (n) determined univocally by the corresponding diagonal section is shown to be the Fibonacci number p n.
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Some results on the convergence of (quasi-) copulas

Fuzzy Sets and Systems, 2012
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
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Some results on a transformation of copulas and quasi-copulas

Information Sciences, 2014
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Dolati, Ali, Mohseni, Soheyla, Úbeda-Flores, Manuel   +2 more
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Compatibility of Three Bivariate Quasi-Copulas: Applications to Copulas

2004
In this paper we discuss the existence of trivariate copulas or quasi-copulas with prescribed three bivariate margins The case of quasi-copulas is completely solved. With respect to copulas, we provide a partial response to an interesting question posed in [8]. Several examples illustrate our results.
José Antonio Rodríguez-Lallena, Manuel Úbeda-Flores   +1 more
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Representation of discrete quasi-copulas through non-square matrices

2008
In this paper a matrix representation for discrete quasi-copulas defined on a non-square grid In× Imof [0,1]2with m=kn, k≥1 is given. The special case of irreducible discrete quasi-copulas (those that cannot be expressed as nontrivial convex combination of other ones) is also studied.
Aguiló Isabel, Suñer Jaume, Torrens Joan   +2 more
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Cell entry and release of quasi-enveloped human hepatitis viruses

Nature Reviews Microbiology, 2023
Anshuman Das, Xin Yin, Christopher Walker   +2 more
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