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    Wyświetlanie 1-7 z 7
    Tytuł:
    Hereditary Equality of Domination and Exponential Domination
    Autorzy:
    Henning, Michael A.
    Jäger, Simon
    Rautenbach, Dieter
    Powiązania:
    https://bibliotekanauki.pl/articles/31342424.pdf
    Data publikacji:
    2018-02-01
    Wydawca:
    Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
    Tematy:
    domination
    exponential domination
    hereditary class
    Opis:
    We characterize a large subclass of the class of those graphs G for which the exponential domination number of H equals the domination number of H for every induced subgraph H of G.
    Źródło:
    Discussiones Mathematicae Graph Theory; 2018, 38, 1; 275-285
    2083-5892
    Pojawia się w:
    Discussiones Mathematicae Graph Theory
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Testing on the first-order autoregressive model with contaminated exponential white noise finite sample case
    Autorzy:
    Fellag, Hocine
    Powiązania:
    https://bibliotekanauki.pl/articles/729886.pdf
    Data publikacji:
    2001
    Wydawca:
    Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
    Tematy:
    autoregressive model
    exponential distribution
    outlier
    test
    Opis:
    The testing problem on the first-order autoregressive parameter in finite sample case is considered. The innovations are distributed according to the exponential distribution. The aim of this paper is to study how much the size of this test changes when, at some time k, an innovation outlier contaminant occurs. We show that the test is rather sensitive to these changes.
    Źródło:
    Discussiones Mathematicae Probability and Statistics; 2001, 21, 1; 11-20
    1509-9423
    Pojawia się w:
    Discussiones Mathematicae Probability and Statistics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hereditary Equality of Domination and Exponential Domination in Subcubic Graphs
    Autorzy:
    Chen, Xue-Gang
    Wang, Yu-Feng
    Wu, Xiao-Fei
    Powiązania:
    https://bibliotekanauki.pl/articles/32324524.pdf
    Data publikacji:
    2021-11-01
    Wydawca:
    Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
    Tematy:
    dominating set
    exponential dominating set
    subcubic graphs
    Opis:
    Let γ(G) and γe(G) denote the domination number and exponential domination number of graph G, respectively. Henning et al., in [Hereditary equality of domination and exponential domination, Discuss. Math. Graph Theory 38 (2018) 275–285] gave a conjecture: There is a finite set ℱ of graphs such that a graph G satisfies (H) = γe(H) for every induced subgraph H of G if and only if G is ℱ-free. In this paper, we study the conjecture for subcubic graphs. We characterize the class ℱ by minimal forbidden induced subgraphs and prove that the conjecture holds for subcubic graphs.
    Źródło:
    Discussiones Mathematicae Graph Theory; 2021, 41, 4; 1067-1075
    2083-5892
    Pojawia się w:
    Discussiones Mathematicae Graph Theory
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Exponential stability of nonlinear non-autonomous multivariable systems
    Autorzy:
    Gil', Michael
    Powiązania:
    https://bibliotekanauki.pl/articles/729507.pdf
    Data publikacji:
    2015
    Wydawca:
    Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
    Tematy:
    nonlinear nonautonomous systems
    exponential stability
    absolute stability
    Opis:
    We consider nonlinear non-autonomous multivariable systems governed by differential equations with differentiable linear parts. Explicit conditions for the exponential stability are established. These conditions are formulated in terms of the norms of the derivatives and eigenvalues of the variable matrices, and certain scalar functions characterizing the nonlinearity. Moreover, an estimate for the solutions is derived. It gives us a bound for the region of attraction of the steady state. As a particular case we obtain absolute stability conditions.
    Our approach is based on a combined usage of the properties of the "frozen" Lyapunov equation, and recent norm estimates for matrix functions. An illustrative example is given.
    Źródło:
    Discussiones Mathematicae, Differential Inclusions, Control and Optimization; 2015, 35, 1; 89-100
    1509-9407
    Pojawia się w:
    Discussiones Mathematicae, Differential Inclusions, Control and Optimization
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Exponential smoothing and resampling techniques in time series prediction
    Autorzy:
    Neves, Maria
    Cordeiro, Clara
    Powiązania:
    https://bibliotekanauki.pl/articles/729996.pdf
    Data publikacji:
    2010
    Wydawca:
    Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
    Tematy:
    time series
    bootstrap
    exponential smoothing
    forecasting
    accuracy measures
    Opis:
    Time series analysis deals with records that are collected over time. The objectives of time series analysis depend on the applications, but one of the main goals is to predict future values of the series. These values depend, usually in a stochastic manner, on the observations available at present. Such dependence has to be considered when predicting the future from its past, taking into account trend, seasonality and other features of the data. Some of the most successful forecasting methods are based on the concept of exponential smoothing. There are a variety of methods that fall into the exponential smoothing family, each having the property that forecasts are weighted combinations of past observations. But time series analysis needs proper statistical modeling. The model that better describes the behavior of the series in study can be crucial in obtaining 'good' forecasts. Departures from the true underlying distribution can adversely affect those forecasts. Resampling techniques have been considered in many situations to overcome that difficulty. For time series, several authors have proposed bootstrap methodologies. Here we will present an automatic procedure built in R language that first selects the best exponential smoothing model (among a set of possibilities) for fitting the data, followed by a bootstrap approach for obtaining forecasts. A real data set has been used to illustrate the performance of the proposed procedure.
    Źródło:
    Discussiones Mathematicae Probability and Statistics; 2010, 30, 1; 87-101
    1509-9423
    Pojawia się w:
    Discussiones Mathematicae Probability and Statistics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Inference on the location parameter of exponential populations
    Autorzy:
    de Fátima Brilhante, Maria
    Mendonça, Sandra
    Pestana, Dinis
    Rocha, Maria
    Powiązania:
    https://bibliotekanauki.pl/articles/729674.pdf
    Data publikacji:
    2009
    Wydawca:
    Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
    Tematy:
    studentization
    analysis of scale
    characterizations
    independence of exponential spacings
    location-scale families
    F-ratio
    Opis:
    Studentization and analysis of variance are simple in Gaussian families because X̅ and S² are independent random variables. We exploit the independence of the spacings in exponential populations with location λ and scale δ to develop simple ways of dealing with inference on the location parameter, namely by developing an analysis of scale in the homocedastic independent k-sample problem.
    Źródło:
    Discussiones Mathematicae Probability and Statistics; 2009, 29, 2; 115-129
    1509-9423
    Pojawia się w:
    Discussiones Mathematicae Probability and Statistics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On two families of tests for normality with empirical description of their performances
    Autorzy:
    Szynal, Dominik
    Wołyński, Waldemar
    Powiązania:
    https://bibliotekanauki.pl/articles/729786.pdf
    Data publikacji:
    2014
    Wydawca:
    Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
    Tematy:
    order statistics
    record values
    U-statistics
    normal distributions
    exponential distributions
    characterizations
    goodness-of-fit tests
    powers
    Opis:
    We discuss two families of tests for normality based on characterizations of continuous distributions via order statistics and record values. Simulations of their powers show that they are competitive to widely recommended tests in the literature.
    Źródło:
    Discussiones Mathematicae Probability and Statistics; 2014, 34, 1-2; 169-185
    1509-9423
    Pojawia się w:
    Discussiones Mathematicae Probability and Statistics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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