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    Wyświetlanie 1-9 z 9
    Tytuł:
    Statistical Analysis of the Fourth Precise Levelling Campaign in Poland
    Statystyczna ocena dokładności czwartej kampanii niwelacji precyzyjnej w Polsce
    Autorzy:
    Łyszkowicz, A.
    Bernatowicz, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/298251.pdf
    Data publikacji:
    2011
    Wydawca:
    Uniwersytet Warmińsko-Mazurski w Olsztynie
    Tematy:
    wyrównanie sieci
    błąd przypadkowy
    błąd systematyczny
    levelling networks
    random errors
    systematic errors
    Opis:
    Paper presents statistical evaluation of accuracy of levelling network measured in Poland in years 1999-2001. The analysis was done using 16 150 misclosures from the double levelling of the sections, 382 misclosures from the double levelling of the lines and 133 loops misclosures. The statistical analysis was conducted by the regression method, correlation method and the analysis of variance. It results that the measured height differences have various accuracy (analysis of variance), and that systematic errors are changing according to the value and sign. The existence of systematic errors causes that the successive neighboring sections of some levelling lines are correlated. The correlation in the majority of the lines is not statistically essential.
    W pracy przedstawiono statystyczną ocenę dokładności sieci niwelacji precyzyjnej pomierzonej w Polsce w latach 1999-2001. Do analizy wykorzystano 16 150 odchyłek z podwójnej niwelacji odcinków, 382 odchyłki z podwójnej niwelacji linii oraz 133 odchyłki zamknięć poligonów. Analizę przeprowadzono metodą regresji, korelacji i metodą analizy wariancji. Z przeprowadzonych analiz wynika, że pomierzone różnice wysokości mają zróżnicowaną dokładność (analiza wariancji) oraz że błędy systematyczne są różne co do wartości i znaku. Istnienie błędów systematycznych powoduje, że kolejne sąsiednie odcinki niektórych linii niwelacyjnych są skorelowane. Korelacja w większości linii nie jest statystycznie istotna.
    Źródło:
    Technical Sciences / University of Warmia and Mazury in Olsztyn; 2011, 14(2); 263-278
    1505-4675
    2083-4527
    Pojawia się w:
    Technical Sciences / University of Warmia and Mazury in Olsztyn
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Estimators of the relations of equivalence, tolerance and preference based on pairwise comparisons with random errors
    Autorzy:
    Klukowski, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/406298.pdf
    Data publikacji:
    2012
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    estimation of relations
    pairwise comparisons with random errors
    nearest adjoining order
    Opis:
    This paper presents a review of results of the author in the area of estimation of the relations of equivalence, tolerance and preference within a finite set based on multiple, independent (in a stochastic way) pairwise comparisons with random errors, in binary and multivalent forms. These estimators require weaker assumptions than those used in the literature on the subject. Estimates of the relations are obtained based on solutions to problems from discrete optimization. They allow application of both types of comparisons – binary and multivalent (this fact relates to the tolerance and preference relations). The estimates can be verified in a statistical way; in particular, it is possible to verify the type of the relation. The estimates have been applied by the author to problems regarding forecasting, financial engineering and bio-cybernetics.
    Źródło:
    Operations Research and Decisions; 2012, 22, 2; 15-34
    2081-8858
    2391-6060
    Pojawia się w:
    Operations Research and Decisions
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Estimation of the partial order on the basis of pairwise comparisons
    Autorzy:
    Klukowski, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/205797.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    estimation of partial order
    multiple pairwise comparisons with random errors
    binary and multivalent comparisons
    Opis:
    The problem of estimation of the partial order on the basis of multiple pairwise comparisons in binary and multivalent form, with random errors, is investigated. The estimators are based on the idea of the nearest adjoining order (see Slater, 1961; Klukowski 2011). Two approaches are examined: comparisons indicating the direction of preference (binary) and comparisons indicating the difference of ranks (multivalent) - both with possibility of existence of incomparable elements. The properties of estimators and the optimization problems formulated in order to obtain them are similar to those for the case of complete relation. However, the assumptions about the distributions of comparison errors are different – they comprise the case of incomparable elements.
    Źródło:
    Control and Cybernetics; 2014, 43, 4; 577-588
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determining an estimate of an equivalence relation for moderate and large sized sets
    Autorzy:
    Klukowski, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/406538.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    estimation
    equivalence relation
    pairwise comparisons
    random errors
    nearest adjoining order
    oszacowanie
    relacja równoważności
    błędy losowe
    najbliższe sąsiedztwo
    Opis:
    This paper presents two approaches to determining estimates of an equivalence relation on the basis of pairwise comparisons with random errors. Obtaining such an estimate requires the solution of a discrete programming problem which minimizes the sum of the differences between the form of the relation and the comparisons. The problem is NP hard and can be solved with the use of exact algorithms for sets of moderate size, i.e. about 50 elements. In the case of larger sets, i.e. at least 200 comparisons for each element, it is necessary to apply heuristic algorithms. The paper presents results (a statistical preprocessing), which enable us to determine the optimal or a near-optimal solution with acceptable computational cost. They include: the development of a statistical procedure producing comparisons with low probabilities of errors and a heuristic algorithm based on such comparisons. The proposed approach guarantees the applicability of such estimators for any size of set.
    Źródło:
    Operations Research and Decisions; 2017, 27, 2; 45-58
    2081-8858
    2391-6060
    Pojawia się w:
    Operations Research and Decisions
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Estimating and testing relations and trees on the basis of pairwise comparisons
    Autorzy:
    Klukowski, Leszek
    Powiązania:
    https://bibliotekanauki.pl/articles/31342752.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    pairwise comparisons with random errors
    estimation of relations
    testing of relations
    estimation of trees
    testing of trees
    nearest adjoining order idea
    Opis:
    The paper presents an ample account on author’s results, concerning the methods of estimating and testing of relations (equivalence, tolerance, preference) and trees on the basis of multiple pairwise comparisons with random errors, which are presented in a new book, Klukowski (2021c). The book contains also main results presented earlier in Klukowski (2011). The new content pertains mainly to: the preference relation with incomparable elements, trees and tests for verification of estimates of the relations. The estimators and tests have good statistical properties; estimators - consistency with good convergence, tests - known distributions of test statistics (exact, limiting or approximate). Some properties of estimates (precision and convergence) have been determined using the simulation approach. The results here reported gain in significance in view of the renewed interest in practical application of pairwise comparisons in various application domains, which give rise to various concrete data analysis problems.
    Źródło:
    Control and Cybernetics; 2022, 51, 4; 501--522
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Implicit random iteration process with errors for asymptotically quasi-nonexpansive in the intermediate sense random operators
    Autorzy:
    Saluja, G. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/952767.pdf
    Data publikacji:
    2012
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    asymptotically quasi-nonexpansive in the intermediate sense random operator
    implicit random iteration process with errors
    common random fixed point
    strong convergence
    separable uniformly convex Banach space
    Opis:
    In this paper, we give a necessary and sufficient condition for the strong convergence of an implicit random iteration process with errors to a common fixed point for a finite family of asymptotically quasi-nonexpansive in the intermediate sense random operators and also prove some strong convergence theorems using condition (C) and the semi-compact condition for said iteration scheme and operators. The results presented in this paper extend and improve the recent ones obtained by S. Plubtieng, P. Kumam and R. Wangkeeree, and also by the author.
    Źródło:
    Opuscula Mathematica; 2012, 32, 2; 327-340
    1232-9274
    2300-6919
    Pojawia się w:
    Opuscula Mathematica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Implicit random iteration process with errors for asymptotically quasi-nonexpansive in the intermediate sense random operators
    Autorzy:
    Saluja, G. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/952775.pdf
    Data publikacji:
    2012
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    asymptotically quasi-nonexpansive in the intermediate sense random operator
    implicit random iteration process with errors
    common random fixed point
    strong convergence
    separable uniformly convex Banach space
    Opis:
    In this paper, we give a necessary and sufficient condition for the strong convergence of an implicit random iteration process with errors to a common fixed point for a finite family of asymptotically quasi-nonexpansive in the intermediate sense random operators and also prove some strong convergence theorems using condition (C) and the semi-compact condition for said iteration scheme and operators. The results presented in this paper extend and improve the recent ones obtained by S. Plubtieng, P. Kumam and R. Wangkeeree, and also by the author.
    Źródło:
    Opuscula Mathematica; 2012, 32, 2; 327-340
    1232-9274
    2300-6919
    Pojawia się w:
    Opuscula Mathematica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of selected data mining techniques in unintentional accounting error detection
    Autorzy:
    Papík, Mário
    Papíková, Lenka
    Powiązania:
    https://bibliotekanauki.pl/articles/22444352.pdf
    Data publikacji:
    2021
    Wydawca:
    Instytut Badań Gospodarczych
    Tematy:
    financial fraud
    unintentional accounting errors
    financial restatements
    decision tree
    classification and regression tree
    random forest
    Opis:
    Research background: Even though unintentional accounting errors leading to financial restatements look like less serious distortion of publicly available information, it has been shown that financial restatements impacts on financial markets are similar to intentional fraudulent activities. Unintentional accounting errors leading to financial restatements then affect value of company shares in the short run which negatively impacts all shareholders. Purpose of the article: The aim of this manuscript is to predict unintentional accounting errors leading to financial restatements based on information from financial statements of companies. The manuscript analysis if financial statements include sufficient information which would allow detection of unintentional accounting errors. Methods: Method of classification and regression trees (decision tree) and random forest have been used in this manuscript to fulfill the aim of this manuscript. Data sample has consisted of 400 items from financial statements of 80 selected international companies. The results of developed prediction models have been compared and explained based on their accuracy, sensitivity, specificity, precision and F1 score. Statistical relationship among variables has been tested by correlation analysis. Differences between the group of companies with and without unintentional accounting error have been tested by means of Kruskal-Wallis test. Differences among the models have been tested by Levene and T-tests. Findings & value added: The results of the analysis have provided evidence that it is possible to detect unintentional accounting errors with high levels of accuracy based on financial ratios (rather than the Beneish variables) and by application of random forest method (rather than classification and regression tree method).
    Źródło:
    Equilibrium. Quarterly Journal of Economics and Economic Policy; 2021, 16, 1; 185-201
    1689-765X
    2353-3293
    Pojawia się w:
    Equilibrium. Quarterly Journal of Economics and Economic Policy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An experimental identification of multipath effect in GPS positioning error
    Autorzy:
    Rumora, I.
    Sikirica, N.
    Filjar, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/116056.pdf
    Data publikacji:
    2018
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    Pseudo Random Noise (PRN)
    accuracy
    GPS positioning errors
    multipath effect
    Base-band Processing Domain (BPD)
    Navigation Processing Domain
    Global Positioning System (GPS)
    Global Navigation Satellite System (GNSS)
    Opis:
    The analysis of the GPS multipath effects in maritime environment is constrained with the practice of traditional GPS receiver design, that prevents access to GPS signals in Base-band Processing Domain. Here we propose and validate a simple method for experimental identification of multipath effect in Navigation Processing Domain, based on spectral characterisation of time series of GPS positioning errors.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2018, 12, 1; 29-32
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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