The Performance of Lag Selection and Detrending Methods for HEGY Seasonal Unit Root Tests

This paper analyzes two key issues for the empirical implementation of parametric seasonal unit root tests, namely generalized least squares (GLS) versus ordinary least squares (OLS) detrending and the selection of the lag augmentation polynomial. Through an extensive Monte Carlo analysis, the performance of a battery of lag selection techniques is analyzed, including a new extension of modified information criteria for the seasonal unit root context. All procedures are applied for both OLS and GLS detrending for a range of data generating processes, also including an examination of hybrid OLS-GLS detrending in conjunction with (seasonal) modified AIC lag selection. An application to quarterly U.S. industrial production indices illustrates the practical implications of choices made

Semi-parametric seasonal unit root tests

We extend the M class of unit root tests introduced by Stock (1999, Cointegration, Causality and Forecasting. A Festschrift in Honour of Clive W.J. Granger. Oxford University Press), Perron and Ng (1996, Review of Economic Studies 63, 435–463) and Ng and Perron (2001, Econometrica 69, 1519–1554) to the seasonal case, thereby developing semi-parametric alternatives to the regression-based augmented seasonal unit root tests of Hylleberg, Engle, Granger, and Yoo (1990, Journal of Econometrics 44, 215–238). The success of this class of unit root tests to deliver good finite sample size control even in the most problematic (near-cancellation) case where the shocks contain a strong negative moving average component is shown to carry over to the seasonal case as is the superior size/power trade-off offered by these tests relative to other available tests

Temporada coreográfica primavera 1974

Ballet de Serge Prokofiev, coreografia d'Erich WalterDe cada obra s'ha digitalitzat un programa sencer. De la resta s'han digitalitzat les parts que són diferents.Empresa: Juan A. PamiasOrquestra del Gran Teatre del Liceu dirigida per Reinhold Kubi

Temporada coreográfica primavera 1974

De cada obra s'ha digitalitzat un programa sencer. De la resta s'han digitalitzat les parts que són diferents.El mandarín maravilloso : música de Béla Bartók, coreografia d'Erich Walter ; La muerte y la doncella : Música de Franz Schubert, coreografia d'Erich Walter ; Daphnis et Chloé : Música de Maurice Ravel, coreografia d'Erich WalterEmpresa: Juan A. PamiasOrquestra del Gran Teatre del Liceu dirigida per Arnold Quenne

Lattice QCD without topology barriers

As the continuum limit is approached, lattice QCD simulations tend to get trapped in the topological charge sectors of field space and may consequently give biased results in practice. We propose to bypass this problem by imposing open (Neumann) boundary conditions on the gauge field in the time direction. The topological charge can then flow in and out of the lattice, while many properties of the theory (the hadron spectrum, for example) are not affected. Extensive simulations of the SU(3) gauge theory, using the HMC and the closely related SMD algorithm, confirm the absence of topology barriers if these boundary conditions are chosen. Moreover, the calculated autocorrelation times are found to scale approximately like the square of the inverse lattice spacing, thus supporting the conjecture that the HMC algorithm is in the universality class of the Langevin equation.Comment: Plain TeX source, 26 pages, 4 figures include

A Traditional Diet Is Associated with a Reduced Risk of Eczema and Wheeze in Colombian Children

Background: Diet might influence the risk of allergic diseases. Evidence from developing countries with high prevalence of childhood asthma is scant. Methods: Information on wheeze, rhinitis, and eczema was collected from 3209 children aged 6–7 years in 2005, who were taking part in the International Study on Asthma and Allergy in Children (ISAAC) in Colombia. Intake frequency of twelve food groups was assessed. Associations between each food group and current wheeze, rhino-conjunctivitis, and eczema were investigated with multiple logistic regressions, adjusting for potential confounders. Simes’ procedure was used to test for multiple comparisons. Results: 14.9% of children reported wheeze in the last 12 months, 16% rhino-conjunctivitis, and 22% eczema. Eczema was negatively associated with consumption of fresh fruits and pulses three or more times per week (adjusted Odds ratio (aOR): 0.64; 95% Confidence Interval (CI): 0.49 to 0.83; p value = 0.004; and aOR: 0.62, 95% CI: 0.47 to 0.80; p value < 0.001, respectively). Current wheeze was negatively associated with intake of potatoes (aOR: 0.44, 95% CI: 0.31 to 0.62, p value = 0.005), whilst this outcome was positively associated with consumption of fast food (aOR: 1.76, 95% CI: 1.32 to 2.35, p value = 0.001). These associations remained statistically significant after controlling for multiple comparisons. Conclusions: A traditional diet might have a protective effect against eczema and wheeze in Colombian children, whilst intake of fast foods increases this risk

Media use during adolescence: the recommendations of the Italian Pediatric Society.

BACKGROUND: The use of media device, such as smartphone and tablet, is currently increasing, especially among the youngest. Adolescents spend more and more time with their smartphones consulting social media, mainly Facebook, Instagram and Twitter because. Adolescents often feel the necessity to use a media device as a means to construct a social identity and express themselves. For some children, smartphone ownership starts even sooner as young as 7 yrs, according to internet safety experts. MATERIAL AND METHODS: We analyzed the evidence on media use and its consequences in adolescence. RESULTS: In literature, smartphones and tablets use may negatively influences the psychophysical development of the adolescent, such as learning, sleep and sigh. Moreover, obesity, distraction, addiction, cyberbullism and Hikikomori phenomena are described in adolescents who use media device too frequently. The Italian Pediatric Society provide action-oriented recommendations for families and clinicians to avoid negative outcomes. CONCLUSIONS: Both parents and clinicians should be aware of the widespread phenomenon of media device use among adolescents and try to avoid psychophysical consequences on the youngest

Decision-Making Competence in Older Adults: A Rosy View From a Longitudinal Investigation

Cross-sectional studies have suggested age-related differences in decision-making competence, but these differences may also reflect cohort-related effects. We present a longitudinal study of age-related changes over 5 years in older adults (aged 60-85) for 3 important aspects of decision-making competence: resistance to framing, applying decision rules, and resistance to sunk costs. The findings show small age-related longitudinal declines in resistance to framing but no decline in applying decision rules or resistance to sunk costs. The results also indicate that individuals' decision-making competence after 5 years is significantly related to their initial decision-making competence assessment and that the contribution of crystallized abilities to decision making in older adults is greater than previously thought

Estimulación del sistema mediado por interferón tipo I de lenguado senegalés (Solea senegalensis) en respuesta a infecciones por nodavirus

El lenguado senegalés es susceptible a la infección por el Virus de la Necrosis Nerviosa Viral (VNNV). Los betanodavirus se clasifican en cuatro genotipos, siendo los genotiposSJNNV, RGNNV y virus recombinantes RGNNV-SJNNV los que causan mortalidad en lenguado. En condiciones experimentales es el recombinante el que provoca mayor mortalidad. Las diferencias en la tasa de mortalidad pueden indicar variaciones en la interacción entre los distintos genotipos y el sistema inmune de lenguado. El sistema del interferón tipo I es un componente esencial de la respuesta inmune frente a infecciones virales, induciendo la expresión de genes que codifican proteínas antivíricas, tales como la Mx, la ISG15 y la PKR. El objetivo del presente trabajo ha sido cuantificar la transcripción de Mx, ISG15 y PKR en respuesta a infecciones por SJNNV, RGNNV y un recombinante RG-SJ.Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech

The Ljapunov-Schmidt reduction for some critical problems

This is a survey about the application of the Ljapunov-Schmidt reduction for some critical problems