Test for long memory processes. A bootstrap approach

Many time series in diverse fields have been found to exhibit long memory. This paper analyzes the behavior of some of the most used tests for long memory: the R/S or rescaled R/S, the GPH (Geweke and Porter-Hudak) and the DFA (Detrended Fluctuation Analysis). Some of these tests exhibit size distortions in small-samples. It is well known that the bootstrap procedure may correct this fact. In this paper, size and power for those tests, for finite samples and different distributions such as normal, uniform and log-normal are investigated. In the case of short memory process, such as AR, MA and ARCH and long memory such as ARFIMA, p-values are calculated using the post-blackening, moving block bootstrap. The Monte Carlo studies suggest that the bootstrap critical values perform better. The results are applied to financial return time series.Long memory, bootstrap, p-value, size correction, Monte Carlo

New talent management tools and techniques: the Microsoft case

Microsoft and talent: favorable working environment based on the sharing of values that inspire and encourage a new style of teamwor

Noves eines i tècniques per a la gestió del talent. El cas de Microsoft

Microsoft i talent: Clima laboral favorable fonamentat en el fet de compartir uns valors que inspiren i fomenten un nou estil de treball en equi

Diabetes: A Multifaceted Disorder

Diabetes is a chronic disease associated with increased morbidity and mortality from cardiovascular diseases cancer, chronic obstructive pulmonary disease, and kidney or liver disease. Despite the fact that aging is the main risk factor for the onset and progressionof type 2 diabetes mellitus (the most common type of diabetes), in recent decades, age-standardized all-cause mortality in the population with type 2 diabetes has fallen morethan in the general population. However, age-specific data indicate that this trend in the total diabetes population is predominantly influenced by trends in those aged 80 or more years. The figures observed in those younger than 80 years indicate that improvements in the management of diabetes and its complications may not have translated into a direct prevention of premature deaths related to type 2 diabetes

Mapping Digital Media: Spain

The Mapping Digital Media project examines the global opportunities and risks created by the transition from traditional to digital media. Covering 60 countries, the project examines how these changes affect the core democratic service that any media system should provide: news about political, economic, and social affairs.Since 2005, Spain has designed and implemented aggressive digitization policies that secured the switchoff of analog television in 2010, and developed the digital terrestrial television (DTT) market to saturation point. As a result, cable and satellite subscription services have experienced some decline since 2008. The rapid rise of free-to-air (FTA) digital television has not, however, been replicated in radio, where take-up of the assigned digital audio broadcasting (DAB) standard has been marginal, with little promise of imminent significant growth. This is attributed to a policy focus on digital television, the absence of a digital radio publicity campaign and a switch-off deadline, and the cost of upgrading to digital radio faced by consumers and broadcasters alike.The roll-out of broadband infrastructure has been successful, accounting for 99 percent of all fixed-line connections in 2010. But the consumers' cost of connection remains one of the highest in the European Union (EU), and an enduring digital divide is reflected in the fact that fixed-line internet connections reached only 22 percent of households in 2010.The report also calls for the setting up of an independent regulatory authority on audiovisual matters; the effective implementation of self-regulatory codes concerning media and children; a comprehensive policy program involving concerted action by state institutions, universities, and journalism associations/unions to tackle problems of journalists' pay and conditions; the effective implementation of ethical codes and principles to challenge the abusive dominance of opinion and ideological polarization in the media; the setting up by the Government of a radiocommunications agency to handle radio spectrum policy;the delegation of DTT licensing to this radiocommunications agency; improved publicity for public tenders through the approval of a law on transparency and citizens' access to public information; the promotion of media literacy in school curricula; and finally, the protection of RTVE's political and financing independence to ensure the provision of non-partisan and good-quality journalism to Spanish society

Llibre de càlcul per a l'optimització d'estructures d'acer per a naus industrials

LLIBRE DE CÁLCUL AMB EL PROGRAMA EXCELL PER REALITZAR EL DIMENSIONAT AUTOMÀTIC I LA OPTIMITZACIÓ DE NAUS INDUSTRIALS D’HACER. PERMET FER EL DIMENSIONAT D’ELEMENTS COM LES CORRETGES I PÒRTICS D’ANIMA PLENA. UTILITZA EL CÀLCUL MATRICIAL PER A REALITZAR ANÀLISIS TANT DE PRIMER COM DE SEGON ORDRE I PERMET COMPARAR DIFERENTS CONFIGURACIONS PER OBTENIR LA MÉS APROPIADA EN CADA CAS

Diari d'un fejocista tonenc. Sebastià Buxaderas Roqueta (octubre de 1937 - abril de 1938)

Entre l’octubre de 1937 i l’abril de 1938 el jove tonenc Sebastià Buxaderas Roqueta, de 17 anys, va escriure d’amagat un diari personal, en el qual recollí les seves vivències al llarg d’aquells mesos transcendentals en el curs de la Guerra Civil. Sebastià Buxaderas, fill d’una família de forners, era militant de la Federació de Joves Cristians de Catalunya. Fins a dia d’avui aquest diari ha restat inèdit. Se’n dóna aquí per primera vegada la transcripció íntegra, convenientment anotad

Maritime business experience in Sydney : port logistics and shipping line management. Differences with the Barcelona's model

The opportunity for a Barcelona’s student to be part of a working experience in the Port Authority of New South Wales (Australia) doesn’t show up every day. I was lucky to have it, so I took it without any doubt. It was a great experience, which brought me not only work experience, but also a lot of personal growth. So, why not trying to explain in a thesis, how I felt and what I learnt about this business. This was my motivation about this project and I think it satisfies what is, for me, the main rule: enjoy doing the project, because it is the best way to give the best of each one and transmit exactly what is wanted. The Port Authority of New South Wales is a company unknown for the majority of us (It was for me before starting the experience). That’s why it is important to do a big introduction of it in the thesis before entering in more technical aspects. I have tried to explain in a way that all readers (not only the maritime sector experts) can achieve a brief idea on how the company works after reading it. But, what is the purpose for people of Barcelona knowing about the business of one Port Authority of Australia? Be able to compare it with a local one, in this case, Barcelona. That’s why after focusing on the Port Authority of New South Wales, I developed a comparison between Sydney and Barcelona. Two big cities, separated for a lot of miles, with different cultures but running a similar business. Which of these two cities has more traffic? Which applies more expensive charges? We will figure it out during the thesis