Congruences for critical values of higher derivatives of twisted Hasse-Weil L-functions

Let A be an abelian variety over a number field k and F a finite cyclic extension of k of p-power degree for an odd prime p. Under certain technical hypotheses, we obtain a reinterpretation of the equivariant Tamagawa number conjecture (eTNC) for A, F/k and p as an explicit family of p-adic congru- ences involving values of derivatives of the Hasse-Weil L-functions of twists of A, normalised by completely explicit twisted regulators. This reinterpretation makes the eTNC amenable to numerical verification and furthermore leads to explicit predictions which refine well-known conjectures of Mazur and Tate

Inflation and inequality bias in the presence of bulk purchases for food and drinks

The aim of this article is the estimation of annual food expenditures with limited information about bulk purchases with data from a Spanish household-budgest survey for 1990-1991. Three alternatives are compared. The first, currently used for official purposes, does not use all the information. The second uses all the available information in a rough way. The third assumes a formal model for the unknown frequency of purchases. The three alternatives are compared by a regression model that should be homogeneous with respect to the dummy variables that represent the partial information of the groups and should show a distinct pattern of outliers under each alternative. Finally, we study the effect of the official and the best alternative on food inflation and inequality measures. We find that they lead to similar inflation rates but to different inequality estimates.Publicad

Inflation and inequality bias in the presence of bulk purchases for food and drinks

We study how to improve the estimation of annual food expenditures from household budget surveys with limited information on bulk purchases. We compare three alternative imputation methods by i) estimating the average amount of over or undervaluation according to a Poisson model of the frequency of purchase, ii) measuring the impact on a food share regression of belonging to household types with different bulk purchase habits, and iii) analyzing the outliers exclusively attributable to the shortcomings of each imputation procedure. Finally, we study the implications of different alternatives on the measurement of food price inflation, food expenditure inequality, and household total expenditure inequality

Facing up a sudden stop of capital flows: Policy lessons from the 90's peruvian experience

This paper assesses the policies implemented in the Peruvian economy in response to the sudden stop of capital flows of the end of the nineties. The Peruvian experience during this episode is an interesting case-study because it offers an example of a highly dollarized economy where a sudden stop of capital flows neither had dramatic negative effects on the banking system nor generated an abrupt fall on output. We argue that the large pool of international reserves, the investments on the tradable sector before 1997 and the performance of the fiscal policy during and before the period of financial distress were fundamental to this outcome. We further extract policy lessons and discuss the strengths and the weakness of the Peruvian economy to this type of shocks nowadays.Sudden Stops, Peru, International Reserves, and Policy Responses

Inflation and inequality bias in the presence of bulk purchases for food and drinks.

The aim of this article is the estimation of annual food expenditures with limited information about bulk purchases with data from a Spanish household-budgest survey for 1990-1991. Three alternatives are compared. The first, currently used for official purposes, does not use all the information. The second uses all the available information in a rough way. The third assumes a formal model for the unknown frequency of purchases. The three alternatives are compared by a regression model that should be homogeneous with respect to the dummy variables that represent the partial information of the groups and should show a distinct pattern of outliers under each alternative. Finally, we study the effect of the official and the best alternative on food inflation and inequality measures. We find that they lead to similar inflation rates but to different inequality estimates.Food-expenditure estimation; Outliers; Poisson distribution; Regression;

Robust methods of building regression models : an application to the housing sector.

This article studies robustification strategies for the linear model in the presence of outliers. The advantages of an internal analysis of the robustness of least squares for a given sample are pointed out. The application of this methodology is illustrated by building an explicit model of the determinants of rental housing values in the Madrid Metropolitan Area.Outliers; Influential observations; Robust regression; Cook distance; Hedonic price function; Housing market;

Characterization of Cardiovascular Risk Factors People Living with HIV in a Veteran Population

Background: CVD is the leading cause of death in PLWH. HIV positive individuals have a 1.5-2-fold greater risk of CVD compared to uninfected individuals, even if complete viral load suppression is achieved. HIV-associated CVD has tripled over the past 20 years, yet scant data is available describing this population. We have characterized CVD risk factors and treatment in PLWH in order to assess and improve cardioprotective treatment. Methods: A retrospective EMR review was conducted for HIV positive patients enrolled at the McGuire VAMC between 12/2018 and 12/2019. Patients were excluded if labs were older than one year from follow-up. Patient demographics was collected along with characterization and treatment of their HIV, hypertension, diabetes, and dyslipidemia. Patient CVD status and risk factors were analyzed, and cardioprotective agent appropriateness was assessed. Results: 242 patients were included in this study. Overall, 91% had HIV viral load ≤ 200. 25% of patients had diabetes, of which 51% were controlled. 86% of patients achieved a blood pressure goal of ≤ 140/90. 40% of patients achieved LDL ≤ 70, with 56% of patients on a statin. 14% of patients had past history significant for cardiovascular event. Conclusion: Characterization of CVD in PLWH should be a high priority and treatment should be closely monitored due to the rising disease state burden. Lack of large clinical trials outlining treatment strategies in this aging population has hindered appropriate patient care. Intensified and targeted cardioprotective strategies are needed due to a high proportion of patients with uncontrolled CVD risk factors.https://scholarscompass.vcu.edu/gradposters/1064/thumbnail.jp

The early evolutionary history of neo-sex chromosomes in Neotropical grasshoppers, Boliviacris noroestensis (Orthoptera: Acrididae: Melanoplinae)

Neo-sex chromosomes are an important component of chromosome variation in Orthoptera, particularly South American Melanoplinae species, which have proven to be outstanding experimental model system to study the mechanism of sex chromosome evolution in this group of insects. In terms of their origin, most derived sex chromosome mechanisms involve a Robertsonian fusion (i.e. translocation) between the ancestral X chromosome and an autosome. In the grasshopper, Boliviacris noroestensis Ronderos & Cigliano (1990) (Orthoptera: Acrididae: Melanoplinae), our results point to a small degree of differentiation (conserved homology between the XR arm and the neo-Y) of the neo-XY chromosomes, which may be of recent evolutionary origin. However, a simple centric fusion model does not explain their origin, mainly because of the observed reduction in the fundamental number (FN) of arms. We propose two models which, we hope, clarify the genesis of B. noroestensis neo-sex chromosomes. Records of karyotype variation in related species due to multiple rearrangements support our models. We propose a possible adaptive advantage for neo-sex chromosome carriers, such changes perhaps representing the primary force that increases their frequency within natural populations compared with non-fused translocated forms, and occurring without apparent detriment to the microevolutionary forces that may also act, at least at the beginning of the evolutionary history of individuals bearing such neo-sex chromosomes.Fil: Castillo, Elio Rodrigo Daniel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste. Instituto de Biología Subtropical. Instituto de Biología Subtropical - Nodo Posadas | Universidad Nacional de Misiones. Instituto de Biología Subtropical. Instituto de Biología Subtropical - Nodo Posadas; ArgentinaFil: Taffarel, Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste. Instituto de Biología Subtropical. Instituto de Biología Subtropical - Nodo Posadas | Universidad Nacional de Misiones. Instituto de Biología Subtropical. Instituto de Biología Subtropical - Nodo Posadas; ArgentinaFil: Marti, Dardo Andrea. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste. Instituto de Biología Subtropical. Instituto de Biología Subtropical - Nodo Posadas | Universidad Nacional de Misiones. Instituto de Biología Subtropical. Instituto de Biología Subtropical - Nodo Posadas; Argentin