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    Wyświetlanie 1-9 z 9
    Tytuł:
    Statistical Modelling: Application to the financial sector
    Autorzy:
    Roçadas, Cláudia
    Oliveira, Teresa
    Mexia, João
    Powiązania:
    https://bibliotekanauki.pl/articles/729944.pdf
    Data publikacji:
    2011
    Wydawca:
    Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
    Tematy:
    populations with periodic reclassification
    likelihood ratio tests
    Markov chains
    isomorphism
    Opis:
    Our research is centred on the stochastic structure of matched open populations, subjected to periodical reclassifications. These populations are divided into sub-populations. In our application we considered two populations of customers of a bank: with and without account manager. Two or more of such population are matched when there is a 1-1 correspondence between their sub-populations and the elements of one of them can go to another, if and only if the same occurs with elements from the corresponding sub-populations of the other. So we have inputs and outputs of elements in the population and along with several sub-populations in which the elements can be placed. It is thus natural to use Markov chains to model these populations.
    Besides this study connected with Markov chains we show how to carry out Analysis of Variance - like analysis of entries and departures to and from de populations of customers. Our purpose is to study the flows in and out of customers in classes for the two populations and to make research on the influence of the factors year, class and region. We used the Likelihood ratio tests for the hypotheses formulated on the basis of these factors. In our work we verified that major hypotheses were all rejected. This raises the question of what are the effects and interactions truly relevant. Looking for an answer to this problem, we present the first partition to a change in the log Likelihood. This partition is very similar to the analysis of variance for the crossing of the factors that allowed us to use algebraic established results, see Fonseca et al. (2003, 2006), for models with balanced cross.
    Źródło:
    Discussiones Mathematicae Probability and Statistics; 2011, 31, 1-2; 103-119
    1509-9423
    Pojawia się w:
    Discussiones Mathematicae Probability and Statistics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Portuguese Diplomatic Correspondence and Information Channels during the War of the Spanish Succession
    Autorzy:
    Oliveira de Carvalho, João Manuel
    Powiązania:
    https://bibliotekanauki.pl/articles/695691.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Instytut Historii im. Tadeusza Manteuffla PAN w Warszawie
    Tematy:
    Diplomatic correspondence
    War of the Spanish Succession
    information typology
    information sources
    mailing routes
    intermediaries
    Opis:
    During the War of the Spanish Succession, Portugal joined the Grand Alliance in 1703. It made it involved, from that year on, in the conflict that included most of the major European Powers in a dispute for the Spanish throne, which, ultimately, represented a contest for dominance in Europe. Under these circumstances, several diplomats were in charge of representing Portugal at the main European courts, protecting its interests and communicating regularly with the court of Lisbon.This paper addresses an understudied set of the correspondence written in this period by Francisco de Sousa Pacheco, the Portuguese envoy to The Hague, to João de Almeida Portugal, Portuguese ambassador to the court of Archduke Charles of Habsburg, one of the pretenders to the Spanish throne, in Barcelona. The main objective of this article is to study the information network established in Europe, mainly in the Grand Alliance side, and the different routes letters followed from The Hague to Barcelona, either using the existing postal system or known intermediaries. Letters were not the only means diplomats had to convey information to their addressees. They also sent other sources of information, like periodicals, accounts of events and pieces of information gathered from different sources, including propaganda in its various forms. It also analyses the developments of the war, the structure and evolution of these letters and the struggle of these diplomats with the other states to make sure their commitments to send military and financial support to the troops were fulfilled. He also wrote about the espionage within the various courts, and the interception diplomatic letters suffered from the opposite side.Ultimately, we’ll see the efforts of these ambassadors as a means for Portugal to gain recognition within Europe, although it ended up with an increasing dependency on foreign states support.
    Źródło:
    Legatio: The Journal for Renaissance and Early Modern Diplomatic Studies; 2018, 2
    2545-1685
    2545-1693
    Pojawia się w:
    Legatio: The Journal for Renaissance and Early Modern Diplomatic Studies
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Joint Regression Analysis applied to genotype stability evaluation over years
    Zastosowanie analizy regresji łącznej do badania stabilności genotypów w doświadczeniach wieloletnich
    Autorzy:
    Oliveira, Amílcar
    Oliveira, Teresa
    Mejza, Stanisław
    Mexia, João T.
    Powiązania:
    https://bibliotekanauki.pl/articles/41512366.pdf
    Data publikacji:
    2008
    Wydawca:
    Instytut Hodowli i Aklimatyzacji Roślin
    Tematy:
    analiza regresji łącznej
    owies
    stabilność genotypów
    genotype stability
    joint regression analysis
    oat
    Opis:
    Most genotype differences connected with yield stability are due to genotype environment interaction. The presence and dimension of this interaction are the factors that determine the performance of genotypes in distinct environments. The environmental factors, like annual rainfall, temperature, diseases or soil fertility, can only explain part of this interaction. Many statistical tools have been developed with the aim to explain the information contained in the GE interaction data matrix. In our work we use the Joint Regression Analysis (JRA), the Zig-Zag Algorithm to estimate the regression coefficients and the multiple comparison tests of Scheffé, Tukey and Bonferroni. We point out not just the limitations of the JRA when used year by year, but also genotype selection advantage from general JRA over years. Data of the Portuguese Plant Breeding Board were used to carry the year and over years analyses of yielding stability of 22 different genotypes of oat (Avena sativa L.) at six different locations in the years 2002, 2003 and 2004.
    Interakcja genotypowo-środowiskowa jest jednym z głównych źródeł różnic w plonowaniu odmian. Istnienie i zakres interakcji determinuje przydatność odmian w różnych środowiskach. Częściowo możemy ją wyjaśnić poprzez niektóre cechy charakteryzujące środowisko takie jak np.: roczna wielkość opadów, temperatura powietrza, częstość występowania chorób, żyzność gleby. W celu wyjaśnienia interakcji genotypowo-środowiskowej wykorzystujemy w pracy informację zawartą w dwuwymiarowej tabeli danych, stosując przy tym następujące metody statystyczne: analiza regresji łącznej, algorytm naprzemienny Zig-Zag, estymacja parametrów równań regresji oraz testy jednoczesne Scheffego, Tukeya i Bonferroniego. Ponadto dyskutujemy użyteczność metody regresji łącznej do selekcji odmian w doświadczeniach pojedynczych oraz w doświadczeniach wielokrotnych i wieloletnich. Rozważania teoretyczne ilustrujemy danymi pochodzącymi z Portugalskiej Sekcji Hodowli Roślin. Dane dotyczą badania stabilności plonu 22 genotypów owsa (Avena sativa L.) na podstawie doświadczeń przeprowadzonych w sześciu miejscowościach w latach 2002, 2003 i 2004.
    Źródło:
    Biuletyn Instytutu Hodowli i Aklimatyzacji Roślin; 2008, 250; 225-235
    0373-7837
    2657-8913
    Pojawia się w:
    Biuletyn Instytutu Hodowli i Aklimatyzacji Roślin
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The impact of macroeconomic factors on the Portuguese Stock Market
    Wpływ czynników makroekonomicznych na portugalski rynek akcyjny
    Autorzy:
    Mota, Jorge
    Santos, João
    Oliveira, Helena
    Moutinho, Victor
    Powiązania:
    https://bibliotekanauki.pl/articles/27315191.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Częstochowska
    Tematy:
    macroeconomic factors
    stock exchange market
    Portuguese Stock Exchange market
    czynniki makroekonomiczne
    rynek giełdowy
    portugalski rynek akcyjny
    Opis:
    Macroeconomic factors impact both the stock markets and society. However, one generic research question remains unanswered: Do all macroeconomic factors impact all markets and all countries with the same strength? This study aims to contribute to the perception of how macroeconomic factors impact the Portuguese Stock Market. It also considers how the Portuguese Stock Market reacts to various factors compared to the North American and Japanese Stock Markets, focusing on the last decade. Using GARCH Models, the results document that the Portuguese Stock Market suffers significant impacts from the EUR-USD exchange rate. In turn, oil and gold prices also have a significant influence. The Japanese market, at first sight, looks more resilient to outside events, but it is also sensitive to gold price fluctuations and the EUR-JPY exchange rate. The North American market especially feels pressure from exchange rates from both the EUR and JPY and Brent.
    Czynniki makroekonomiczne wpływają zarówno na rynki akcji, jak i na społeczeństwo. Jednak jeden generyczny aspekt badawczy pozostaje bez odpowiedzi: Czy wszystkie czynniki makroekonomiczne wpływają na wszystkie rynki i wszystkie kraje w takim samym stopniu? Niniejsze opracowanie ma na celu przyczynienie się do postrzegania wpływu czynników makroekonomicznych na portugalski rynek akcyjny. Rozważono również, w jaki sposób portugalski rynek akcji reaguje na różne czynniki w porównaniu z północno amerykańskim i japońskim rynkiem akcji, koncentrując się na ostatniej dekadzie. Korzystając z modeli GARCH, wyniki dokumentują, że portugalski rynek akcji odczuwa znaczący wpływ kursu wymiany EUR-USD', podobnie jak ceny ropy naftowej i złota. Rynek japoński na pierwszy rzut oka wydaje się bardziej odporny na wydarzenia zewnętrzne, ale jest również wrażliwy na wahania cen złota i kurs wymiany EUR-JPY. Rynek północnoamerykański szczególnie odczuwa presję ze strony kursów wymiany zarówno EUR i JPY, jak i ropy Brent.
    Źródło:
    Polish Journal of Management Studies; 2023, 27, 1; 241--257
    2081-7452
    Pojawia się w:
    Polish Journal of Management Studies
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Online and FREE access to plasma physics experiments
    Autorzy:
    Mendes Rossa, Pedro A.
    Kuriščák, Pavel
    Silva, João N.
    Veiga, José
    Loureiro, João P. S.
    Oliveira, João
    Hachmeister, Daniel
    Fernandes, Horácio
    Powiązania:
    https://bibliotekanauki.pl/articles/2202569.pdf
    Data publikacji:
    2023
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    educational technology
    e-lab
    electromagnetic cavity
    langmuir probe
    remote controlled experiment
    Opis:
    Remote controlled laboratories had a great push during the COVID-19 pandemic. In fact, they were already out there but lacking in visibility. This external trigger pushed the academy to face a global challenge to start offering remote experiments more consistently and maturely. Instituto Superior Técnico (IST) has been offering several remote experiments since 2000 but with the need for an update due to technological aging. As such, the framework for remote experiments in education (FREE) was created based on new web technologies. In addition to the most diverse experiments that had already been developed, FREE includes two experiments that aimed at advanced-level physics students: the Langmuir probe and the electromagnetic (EM) cavity. Both allow users to configure the various parameters and to access the results in real time or check back later. All this access is done using a browser (on a PC or mobile phone) without the need to install additional software. The results of an experimental execution are stored in a database and are downloadable, allowing users to do various analyses and to determine the corresponding plasma density and temperature. In this paper, we will introduce how FREE was used in the implementation of both experiments and give an insight into their didactic approach, such as: (i) how to perform an experimental execution, (ii) the typical data set obtained with, and (iii) the corresponding analysis necessary for the user to retrieve information from it.
    Źródło:
    Nukleonika; 2023, 68, 1; 37--46
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Confidence intervals for large non-centrality parameters
    Autorzy:
    Inacio, Sonia
    Oliveira, Manuela
    Mexia, João
    Powiązania:
    https://bibliotekanauki.pl/articles/729746.pdf
    Data publikacji:
    2015
    Wydawca:
    Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
    Tematy:
    asymptotic linearity
    non-centrality parameters
    highly significant
    F tests
    measure relevance
    Opis:
    We use asymptotic linearity to derive confidence intervals for large non-centrality parameters. These results enable us to measure relevance of effects and interactions in multifactors models when we get highly statistically significant the values of F tests statistics. We show how to use our approach by considering two sets of data as application examples.
    Źródło:
    Discussiones Mathematicae Probability and Statistics; 2015, 35, 1-2; 45-56
    1509-9423
    Pojawia się w:
    Discussiones Mathematicae Probability and Statistics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Key-Points of Ring Muscle-Up Execution on Movement Performance: A Translational Perspective from Artistic Gymnastics to Mixed Modality Training Workouts
    Autorzy:
    dos Santos Rocha, José Alberto
    Pereira, Gustavo
    Kilipper, Rafael
    Pereira, João
    Barsanulfo, Silvio
    Barros Castro, Fernanda
    da Silva Passos, Rafael
    Alves Oliveira, Alinne
    Pereira, Rafael
    Powiązania:
    https://bibliotekanauki.pl/articles/1030844.pdf
    Data publikacji:
    2020
    Wydawca:
    Uniwersytet Szczeciński. Wydawnictwo Naukowe Uniwersytetu Szczecińskiego
    Tematy:
    Mixed Modality Training
    artistic gymnastics
    crossfit
    kinematics
    movement economy
    Opis:
    Background: The inclusion of gymnastic-based movements in workout routines in many exercise training programs, generally called mixed modality training (MMT), and even in many competitions, is increasingly common. In contrast to artistic gymnastic competitions, MMT workouts aim to complete as many movements as quickly as possible, which tends to deform the movement pattern proposed by artistic gymnastics. Execution of the MMT workouts with more of the gymnastics-based style (i.e., based on the gymnastics movement pattern) could improve performance in exercises with a high-level complexity, such as the “ring muscle up” (RMU). Thus, this study aimed to analyze the kinematic aspects of RMU, performed by a former gymnast both with and without the gymnastics based style. Methods: A former gymnast with a successful transition to MMT, carried out RMU using two movement patterns: 1) close to the classical artistic gymnastics pattern (“Front uprise”), and 2) close to that used by many athletes not from gymnastics. The athlete performed RMU, three times with each proposed movement pattern. Images were captured using a high-speed digital camera. Hip and ankle displacement, velocity and acceleration were recorded and analyzed. Results: The execution of RMU was faster and the hip vertical displacement was greater when RMU was carried out with a gymnastics-based style, while ankle displacement path, peak velocity and acceleration were lower. Conclusion: The use of a gymnastics-based style to carry out RMU seems to be advantageous from the biomechanical point of view, favoring the performance of RMU.
    Źródło:
    Central European Journal of Sport Sciences and Medicine; 2020, 29, 1; 41-51
    2300-9705
    2353-2807
    Pojawia się w:
    Central European Journal of Sport Sciences and Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On the matrix form of Kronecker lemma
    Autorzy:
    da Silva, João
    Oliveira, António
    Powiązania:
    https://bibliotekanauki.pl/articles/729968.pdf
    Data publikacji:
    2009
    Wydawca:
    Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
    Tematy:
    matrix Kronecker lemma
    matrix analysis
    convergence
    Opis:
    A matrix generalization of Kronecker's lemma is presented with assumptions that make it possible not only the unboundedness of the condition number considered by Anderson and Moore (1976) but also other sequences of real matrices, not necessarily monotone increasing, symmetric and nonnegative definite. A useful matrix decomposition and a well-known equivalent result about convergent series are used in this generalization.
    Źródło:
    Discussiones Mathematicae Probability and Statistics; 2009, 29, 2; 233-243
    1509-9423
    Pojawia się w:
    Discussiones Mathematicae Probability and Statistics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Canonic inference and commutative orthogonal block structure
    Autorzy:
    Carvalho, Francisco
    Mexia, João
    Oliveira, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/729946.pdf
    Data publikacji:
    2008
    Wydawca:
    Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
    Tematy:
    COBS
    canonical inference
    commutative Jordan algebras
    Opis:
    It is shown how to define the canonic formulation for orthogonal models associated to commutative Jordan algebras. This canonic formulation is then used to carry out inference. The case of models with commutative orthogonal block structures is stressed out.
    Źródło:
    Discussiones Mathematicae Probability and Statistics; 2008, 28, 2; 171-181
    1509-9423
    Pojawia się w:
    Discussiones Mathematicae Probability and Statistics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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