Search results for "RICE"
showing 10 items of 2331 documents
Le opportunità della crisi. Letteratura latina, formazione, ricerca
2012
Riflessione sulle prospettive dell'insegnamento/apprendimento della letteratura latina nella cornice di svalutazione che ha colpito i cosiddetti "saperi umanistici" nei percorsi universitari e nel dibattito scientifico.
Futures pricing in electricity markets based on stable CARMA spot models
2012
We present a new model for the electricity spot price dynamics, which is able to capture seasonality, low-frequency dynamics and the extreme spikes in the market. Instead of the usual purely deterministic trend we introduce a non-stationary independent increments process for the low-frequency dynamics, and model the large uctuations by a non-Gaussian stable CARMA process. The model allows for analytic futures prices, and we apply these to model and estimate the whole market consistently. Besides standard parameter estimation, an estimation procedure is suggested, where we t the non-stationary trend using futures data with long time until delivery, and a robust L 1 -lter to nd the states of …
A multi-scale area-interaction model for spatio-temporal point patterns
2018
Models for fitting spatio-temporal point processes should incorporate spatio-temporal inhomogeneity and allow for different types of interaction between points (clustering or regularity). This paper proposes an extension of the spatial multi-scale area-interaction model to a spatio-temporal framework. This model allows for interaction between points at different spatio-temporal scales and the inclusion of covariates. We fit the proposed model to varicella cases registered during 2013 in Valencia, Spain. The fitted model indicates small scale clustering and regularity for higher spatio-temporal scales.
Sector identification in a set of stock return time series traded at the London Stock Exchange
2005
We compare some methods recently used in the literature to detect the existence of a certain degree of common behavior of stock returns belonging to the same economic sector. Specifically, we discuss methods based on random matrix theory and hierarchical clustering techniques. We apply these methods to a portfolio of stocks traded at the London Stock Exchange. The investigated time series are recorded both at a daily time horizon and at a 5-minute time horizon. The correlation coefficient matrix is very different at different time horizons confirming that more structured correlation coefficient matrices are observed for long time horizons. All the considered methods are able to detect econo…
Let’s Ask About Sex : Methodological Merits of the Sealed Envelope Technique in Face-to-Face Interviews
2020
When it comes to deviant behavior and other sensitive topics, respondents in surveys tend either to refuse answering such sensitive questions or to tailor their answers in a socially desirable direction. This occurs by underreporting on negatively connoted behaviors or attitudes and by overreporting on positively connoted ones (be it deliberately or undeliberate). Thus, prevalence estimates of deviant traits are biased. Moreover, if the tendency to misreport is related to influencing factors of the deviant behavior or attitude under investigation, the correlations are biased as well.
Pricing to market behaviour in European car markets
2003
Abstract This paper investigates PTM behaviour in European car markets for a period of great interest (1993–98), taking into account the role of invoicing currency. The results indicate that local currency price stability is a strong and pervasive phenomenon across products independently of the invoicing currency. The paper offers robustness checks, tests and arguments that justify the interpretation of this finding, at least in part, as evidence of PTM. It implies the existence of market segmentation and price discrimination, despite the completion of the single market programme on 1 January 1993.
A fast 3D BEM for anisotropic elasticity based on hierarchical matrices
2008
In this paper a fast solver for three-dimensional anisotropic elasticity BEM problems is developed. The technique is based on the use of hierarchical matrices for the representation of the collocation matrix and uses a preconditioned GMRES for the solution of the algebraic system of equations. The preconditioner is built exploiting the hierarchical arithmetic and taking full advantage of the hierarchical format. The application of hierarchical matrices to the BEM solution of anisotropic elasticity problems has been numerically demonstrated highlighting both accuracy and efficiency leading to almost linear computational complexity.
Fast Solution of 3D Elastodynamic Boundary Element Problems by Hierarchical Matrices
2009
In this paper a fast solver for three-dimensional elastodynamic BEM problems formulated in the Laplace transform domain is presented, implemented and tested. The technique is based on the use of hierarchical matrices for the representation of the collocation matrix for each value of the Laplace parameter of interest and uses a preconditioned GMRES for the solution of the algebraic system of equations. The preconditioner is built exploiting the hierarchical arithmetic and taking full advantage of the hierarchical format. An original strategy for speeding up the overall analysis is presented and tested. The reported numerical results demonstrate the effectiveness of the technique.
1443Safety of red yeast rice supplementation: a systematic review and meta-analysis of randomized controlled trials
2019
Abstract Background Recently, concerns regarding the safety of red yeast rice (RYR) have been raised after the publication of some case reports claiming toxicity. Purpose Since the previous meta-analyses on the effects of RYR were mainly focused on its efficacy to improve the lipid profile and other cardiovascular parameters, we carried out a meta-analysis on safety data derived from the available randomized controlled clinical trials (RCTs). Methods Primary outcomes were musculoskeletal disorders (MuD). Secondary outcomes were non-musculoskeletal adverse events (Non-MuD) and serious adverse events (SAE). Subgroups analyses were carried out considering the intervention (RYR alone or in asso…
Considerazioni critiche sull’applicazione giurisprudenziale del reato di commercio illecito di sostanze dopanti
2015
Il lavoro prende in esame in modo critico i rapporti tra il reato di ricettazione e il reato di commercio illecito di sostanze dopanti e la tendenza che evidenzia la giurisprudenza, nel caso di specie, ha porre in essere un eccesso sanzionatorio.