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    Wyświetlanie 1-4 z 4
    Tytuł:
    Application of expectation maximization method for purchase decision-making support in welding branch
    Autorzy:
    Kujawińska, A.
    Rogalewicz, M.
    Diering, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/407123.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    cluster analysis
    welding process
    expectation
    maximization method
    Opis:
    The article presents a study of applying the proposed method of cluster analysis to support purchasing decisions in the welding industry. The authors analyze the usefulness of the non-hierarchical method, Expectation Maximization (EM), in the selection of material (212 combinations of flux and wire melt) for the SAW (Submerged Arc Welding) method process. The proposed approach to cluster analysis is proved as useful in supporting purchase decisions.
    Źródło:
    Management and Production Engineering Review; 2016, 7, 2; 29-33
    2080-8208
    2082-1344
    Pojawia się w:
    Management and Production Engineering Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Quality of Tests of Expectation Formation for Revised Data
    Autorzy:
    Ziembińska, Paulina
    Powiązania:
    https://bibliotekanauki.pl/articles/2075318.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    data revisions
    macroeconomic forecasts
    Polish economy
    rational expectations
    expectation processes
    Opis:
    The work contains discussions and simulation analyses of the expectation formation processes, taking account of the data revisions. In particular, it contains results of simulations examining statistical properties of the rationality tests and extrapolation processes, with particular focus on their behaviour in the case of short samples and data with measurement errors. The conclusions indicate that the rationality test based on the optimal regression and the proposed adaptive and accelerating tests are the most efficient and flexible. The tests showcasing best properties have been applied to a new set of macroeconomic forecasts for Poland. The results show that there are no grounds for rejecting the hypothesis on the rationality of forecasts derived from the National Bank of Poland (NBP) and the Organisation for Economic Cooperation and Development; however, this property was rejected for the European Commission. What is more, the comparative analysis indicates that only the national institution (NBP) may potentially aim the final readings of the macroeconomic data as the forecasting target. Finally, it transpires that the extrapolative models, albeit simple and intuitively interpreted, generally fail to correctly explain the forecast formation processes regarding the Polish economy
    Źródło:
    Central European Journal of Economic Modelling and Econometrics; 2021, 4; 405-453
    2080-0886
    2080-119X
    Pojawia się w:
    Central European Journal of Economic Modelling and Econometrics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Two stage EMG onset detection method
    Autorzy:
    Drapała, J.
    Brzostowski, K.
    Szpala, A.
    Rutkowska-Kucharska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/229365.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    EMG signal processing
    real EMG recordings
    expectation-maximization
    kernel density estimation
    event detection
    Opis:
    Detection of the moment when a muscle begins to activate on the basis of EMG signal is important task for a number of biomechanical studies. In order to provide high accuracy of EMG onset detection, we developed novel method, that give results similar to that obtained by an expert. By means of this method, EMG is processed in two stages. The first stage gives rough estimation of EMG onset, whereas the second stage performs local, precise searching. The method was applied to support signal processing in biomechanical study concerning effect of body position on EMG activity and peak muscle torque stabilizing spinal column under static conditions.
    Źródło:
    Archives of Control Sciences; 2012, 22, 4; 427-440
    1230-2384
    Pojawia się w:
    Archives of Control Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Lies, Damned Lies, and Statistics? Examples From Finance and Economics
    Autorzy:
    Abadir, Karim M.
    Powiązania:
    https://bibliotekanauki.pl/articles/483313.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    flexible density specification
    option pricing
    term structure of interest rates
    expectation hypothesis
    nonlinear long-memory
    macroeconomic dynamics
    Opis:
    Reliable data analysis is one of the hardest tasks in sciences and social sciences. Often misleading and sometimes puzzling results arise when the analysis is done without regard for the special features of the data. In this exposition, I will focus on designing new statistical tools to deal with some prominent questions in Finance and Economics. In particular, I will talk about the following. (1) How to characterize the randomness of variables, motivated by a problem in the pricing of financial options. (2) Uncovering the relation between interest rates on different maturities, now and in the future; the "term structure of interest rates". (3) Modelling the unconventional nonlinear long-memory dynamics that arise from a general-equilibrium economic model, and their implications for exchange rates, stock market indexes, and all macroeconomic variables; with recommendations for trading in financial markets, but also for the design of macroeconomic stabilization policies by governments.
    Źródło:
    Central European Journal of Economic Modelling and Econometrics; 2013, 5, 4; 231-248
    2080-0886
    2080-119X
    Pojawia się w:
    Central European Journal of Economic Modelling and Econometrics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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