Partial correlation vines and the onion method are presented for generating random correlation matrices. As a special case, a uniform distribution over the set of d× d positive definite correlation matrices obtains. Byproducts are: (a) For a uniform distribution over the space of d × d correlation matrices, the marginal distribution of each correlation is Beta(d/2, d/2) on (−1, 1). (b) An ident...

With the aim of determining whether grafting could improve salinity tolerance of tomato (Lycopersicon esculentum Mill.), and what characteristics of the rootstock were required to increase the salt tolerance of the shoot, a commercial tomato hybrid (cv. Jaguar) was grafted onto the roots of several tomato genotypes with different potentials to exclude saline ions. The rootstock effect was asses...

Grafting is effectively used worldwide to overcome abiotic and biotic factors impacting yield, including soil temperature. Field studies were conducted in 2020 2021 a cool Mediterranean climate (average daily air temperature range of 12.8–17.1 °C) identify suitable rootstock combinations for grafted cantaloupe (Cucumis melo var. reticulatus) evaluate fruit yield quality. Cantaloupe cultivars Su...

The mountain environment is perceived today by vine-growers as a strong structural constraint. Yet in the current context of climate change, in which we turn to genetics, irrigation or innovation in cultural practices to maintain production quality, could the mountain environment emerge as a solution for adapting to climate change in vine-growing? Here we explore the role of cooperative policie...

The identification of an appropriate multivariate copula for capturing the dependence structure in multivariate data is not straightforward. The reason is because standard multivariate copulas (such as the multivariate Gaussian, Student-t, and exchangeable Archimedean copulas) lack flexibility to model dependence and have other limitations, such as parameter restrictions. To overcome these prob...

It has been shown that vine copulas constructed from bivariate t copulas can provide good fits to multivariate financial asset return data. However, there might be stronger tail dependence of returns in the joint lower tail of assets than the upper tail. To this end, vine copula models with appropriate choices of bivariate reflection asymmetric linking copulas will be used to assess such tail a...

BACKGROUND Kudzu (Pueraria thunbergiana) root has long been used in Traditional Chinese Medicine. However, the vine of the kudzu plant has been considered waste material. This study aimed to investigate the hepatoprotective properties of the kudzu vine. METHODS We created 0 %, 30 %, 70 %, and 95 % ethanolic kudzu vine extracts. The isoflavone contents of kudzu vine extract were quantified by ...

Previous work has suggested that peach scion cultivar exerts a significant influence on incidence of peach tree short life (PTSL) in trees budded onto Nemaguard and Flordaguard seedling peach rootstocks. If this influence is consistent across a range of rootstocks then the influence of scion cultivar might offer a new tool for the management of PTSL. Growers could minimize losses on those sites...

In this paper we establish the convergence of the vine copulas estimator and prove that all vine copula estimator have comparable asymptotic variance. We make these proofs under weaker hypothesis than that of the framework usually considered in the literature. Namely, we lift the conditional independence hypothesis through the use of conditional copulas. We also exhibit the underlying tree stru...