Quasi-copulas and signed measures
We study the relationship between multivariate quasi-copulas and measures that they may or may not induce on [0, 1](n). We first study the mass distribution of the pointwise best possible lower bound for the set of n-quasi-copulas for a n >= 3. As a consequence, we show that not every n-quasi-copula induces a signed measure on [0, 1](n). (C) 2010 Elsevier B.V. All rights reserved.
quasi-copula signed measure measure copula stochastic measure stochastic signed measure