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We present a method for constructing symmetric copulas which generalizes the diagonal patchwork construction of copulas procedure. We also show how it is related to a new construction of a generalized Farlie–Gumbel–Morgenstern distribution and to the copula transforms. The description of the dependence among random variables has been a subject extensively… (More)
Main goals: • Study of (bivariate) quasi-copulas with fractal mass distributions.
We show that there exist bivariate proper quasi-copulas that do not induce a doubly stochas-tic signed measure on [0, 1] 2. We construct these quasi-copulas from the so-called proper quasi-transformation square matrices.
We introduce and characterize the class of multivariate quasi-copulas with quadratic sections in one variable. We also present and analyze examples to illustrate our results.
Residue levels and degradation rates of five benzoylphenylurea insecticides were studied in zucchinis and peppers grown in experimental greenhouses in Almería (Spain). Benzoylphenylurea residues were analyzed by HPLC using on-line post-elution photoirradiation with fluorescence detection. Mathematically defined decline curves were established by determining… (More)