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Wyświetlanie 1-15 z 94
Tytuł:
On Some Estimator of Finite Population Skewness Under Nonresponse
O pewnym estymatorze współczynnika skośności przy brakach odpowiedzi
Autorzy:
Gamrot, Wojciech
Powiązania:
https://bibliotekanauki.pl/articles/906275.pdf
Data publikacji:
2009
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
finite population skewness
incomplete data
estimation
Opis:
Jedną z najpopularniejszych miar asymetrii rozkładu cechy w populacji jest współczynnik skośności wyznaczany poprzez standaryzację trzeciego momentu centralnego względem średniej. W niniejszej pracy rozważono wykorzystanie powszechnie znanej procedury losowania dwufazowego do szacowania współczynnika skośności w populacji skończonej przy brakach odpowiedzi. Zaproponowano estymator tego współczynnika będący funkcją znanych nieobciążonych estymatorów wartości globalnych cechy w populacji. Własności skonstruowanego estymatora zbadano w drodze symulacji komputerowych. W eksperymentach wykorzystano dane uzyskane podczas spisu rolnego w wybranych gminach powiatu Dąbrowa Tarnowska.
One of the most popular measures for the assymetry o f distribution is the coefficient of skewness computed by standarizing the third central moment about the mean. In this paper the well-known two-phase sampling procedure is applied to estimate the finite population skewness under nonresponse. An estimator of this parameter is constructed as a function of well-known unbiased estimators of population totals. The properties of proposed estimator are investigated by the simulation study. The data obtained from agricultural census in boroughs of the Dąbrowa Tarnowska district is used in simulations.
Źródło:
Acta Universitatis Lodziensis. Folia Oeconomica; 2009, 228
0208-6018
2353-7663
Pojawia się w:
Acta Universitatis Lodziensis. Folia Oeconomica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On a characterization of symmetric balanced incomplete block designs
Autorzy:
Mohan, R.
Kageyama, Sanpei
Nair, M.
Powiązania:
https://bibliotekanauki.pl/articles/729802.pdf
Data publikacji:
2004
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
symmetric balanced incomplete block (SBIB) design
Opis:
All the symmetric balanced incomplete block (SBIB) designs have been characterized and a new generalized expression on parameters of SBIB designs has been obtained. The parameter b has been formulated in a different way which is denoted by bi, i = 1, 2, 3, associating with the types of the SBIB design Di. The parameters of all the designs obtained through this representation have been tabulated while corresponding them with the suitable formulae for the number ofblocks bi and the expression Si for the convenience of practical users for constructional methods of certain designs, which is the main theme of this paper.
Źródło:
Discussiones Mathematicae Probability and Statistics; 2004, 24, 1; 41-58
1509-9423
Pojawia się w:
Discussiones Mathematicae Probability and Statistics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An improved comparison of three rough set approaches to missing attribute values
Autorzy:
Grzymala-Busse, J. W.
Grzymala-Busse, W. J.
Hippe, Z. S.
Rząsa, W.
Powiązania:
https://bibliotekanauki.pl/articles/969797.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
incomplete data sets
missing attribute values
approximations for incomplete data
LERS data mining system
MLEM2 algorithm
Opis:
In a previous paper three types of missing attribute values: lost values, attribute-concept values and "do not care" conditions were compared using six data sets. Since previous experimental results were affected by large variances due to conducting experiments on different versions of a given data set, we conducted new experiments, using the same pattern of missing attribute values for all three types of missing attribute values and for both certain and possible rules. Additionally, in our new experiments, the process of incremental replacing specified values by missing attribute values was terminated when entire rows of the data sets were full of missing attribute values. Finally, we created new, incomplete data sets by replacing the specified values starting from 5% of all attribute values, instead of 10% as in the previous experiments, with an increment of 5% instead of the previous increment of 10%. As a result, it is becoming more clear that the best approach to missing attribute values is based on lost values, with small difference between certain and possible rules, and that the worst approach is based on "do not care" conditions, certain rules. With our improved experimental setup it is also more clear that for a given data set the type of the missing attribute values should be selected individually.
Źródło:
Control and Cybernetics; 2010, 39, 2; 469-486
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Some notes about singular two pan design
Autorzy:
Ceranka, Bronisław
Graczyk, Małgorzata
Powiązania:
https://bibliotekanauki.pl/articles/658361.pdf
Data publikacji:
2011
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
balanced incomplete block design
two pan design
Opis:
W literaturze dotyczącej optymalnej estymacji nieznanych miar obiektów w modelu chemicznego układu wagowego przyjmuje się założenie, że układ jest nieosobliwy. Autorzy w pracy odpowiadają na pytanie co zrobić, gdy macierz układu nie jest macierzą pełnego rzędu kolumnowego.
Źródło:
Acta Universitatis Lodziensis. Folia Oeconomica; 2011, 255
0208-6018
2353-7663
Pojawia się w:
Acta Universitatis Lodziensis. Folia Oeconomica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelling Recovery Rate for Incomplete Defaults Using Time Varying Predictors
Autorzy:
Starosta, Wojciech
Powiązania:
https://bibliotekanauki.pl/articles/2075502.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
LGD
workout approach
incomplete defaults
partial recovery rates
Opis:
The Internal Rating Based (IRB) approach requires that financial institutions estimate the Loss Given Default (LGD) parameter not only based on closed defaults but also considering partial recoveries from incomplete workouts. This is one of the key issues in preparing bias-free samples, as there is a need to estimate the remaining part of the recovery for incomplete defaults before including them in the modeling process. In this paper, a new approach is proposed, where parametric and non-parametric methods are presented to estimate the remaining part of the recovery for incomplete defaults, in pre- defined intervals concerning sample selection bias. Additionally it is shown that recoveries are driven by different set of characteristics when default is aging. As an example, a study of major Polish bank is presented, where regression tree outperforms other methods in the secured products segment, and fractional regression provides the best results for non-secured ones.
Źródło:
Central European Journal of Economic Modelling and Econometrics; 2020, 2; 195-225
2080-0886
2080-119X
Pojawia się w:
Central European Journal of Economic Modelling and Econometrics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Efectiveness of Chinas Foreign Trade Liberalization
Autorzy:
Cieślik, Andrzej
Tseyang, Tenzin
Powiązania:
https://bibliotekanauki.pl/articles/1955006.pdf
Data publikacji:
2021-12-10
Wydawca:
Uniwersytet Warszawski. Wydział Geografii i Studiów Regionalnych
Tematy:
China
trade liberalization
incomplete specialization
gravity model
WTO
Opis:
This paper studies the ex-post trade efects of China's multilateral, regional and bilateral trade liberalization using augmented gravity and panel data estimation methods for the period 1995-2016. China's accession to the WTO was revealed to have had a significant impact on the volume of trade as well as on bilateral exports and imports. Regional trade agreements and the majority of bilateral trade agreements were found not to be efective in increasing China's foreign trade. Only the agreements with Chile, Costa Rica and Switzerland were efective in increasing China's trade volume. Moreover, the results for Chile were driven by increases in both exports and imports, while for Costa Rica and Switzerland only by increased imports from these countries.
Źródło:
Miscellanea Geographica. Regional Studies on Development; 2021, 25, 4; 238-245
0867-6046
2084-6118
Pojawia się w:
Miscellanea Geographica. Regional Studies on Development
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Heaping Effect in the Survey Data on the Number of Friends
Autorzy:
Nawojczyk, M.
Stojkow, M.
Żuchowska-Skiba, D.
Krawczyk, M.
Kułakowski, K.
Powiązania:
https://bibliotekanauki.pl/articles/1029538.pdf
Data publikacji:
2018-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
social systems
random walk
exit time
incomplete knowledge
Opis:
The number of acquaintances is relevant for modeling social networks. Here we consider the data on the declared number of friends, as collected in 2000, 2007 and 2015 from Polish respondents above the age of 50. We demonstrate that the answers on the number of friends show sharp maxima at 10, 15, 20 and sometimes 30, which accompany a broader peak between 0 and 8. These results do not change qualitatively with sex and age of the respondents. The effect, known as data heaping, can be detected as a deviation from the Benford law.
Źródło:
Acta Physica Polonica A; 2018, 133, 6; 1417-1420
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modele hierarchiczne w prognozowaniu zmiennych o wysokiej częstotliwości obserwowania w warunkach braku pełnej informacji
Hierarchical models in forecasting of the high-frequency variables in the conditions of lack of full information
Autorzy:
Szmuksta-Zawadzka, Maria
Zawadzki, Jan
Powiązania:
https://bibliotekanauki.pl/articles/425235.pdf
Data publikacji:
2014
Wydawca:
Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu
Tematy:
high-frequency data
hierarchical models
incomplete time series
Opis:
The paper presents a procedure of application of regular hierarchical models in forecasting missing data in high-frequency time series with cyclical fluctuations. Annual, weekly and daily cycles of seasonal fluctuation have additive character. Separately regular hierarchical models have been built for even length cycles.Theoretical considerations are illustrated with an empirical example.
Źródło:
Econometrics. Ekonometria. Advances in Applied Data Analytics; 2014, 4(46); 72-84
1507-3866
Pojawia się w:
Econometrics. Ekonometria. Advances in Applied Data Analytics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Some Remarks About Variance Balanced Block Design
Uwagi o zrównoważonych w sensie wariancji układach bloków
Autorzy:
Ceranka, Bronisław
Graczyk, Małgorzata
Powiązania:
https://bibliotekanauki.pl/articles/906290.pdf
Data publikacji:
2009
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
balanced incomplete block design
variance balanced block design
Opis:
W pracy zostały przedstawione metody konstrukcji zrównoważonych w sensie wariancji układów bloków dla v oraz v + 1 obiektów. Metody te są oparte na macierzach incydencji układów zrównoważonych o blokach niekompletnych.
Some construction methods of the variance balanced block designs for v and v + 1 treatments are given. They are based on the incidence matrices o f the balanced incomplete block designs.
Źródło:
Acta Universitatis Lodziensis. Folia Oeconomica; 2009, 228
0208-6018
2353-7663
Pojawia się w:
Acta Universitatis Lodziensis. Folia Oeconomica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Congenital incomplete bowel rotation: an exceptionally rare case of incomplete bowel rotation in an adult patient presenting with symptoms of gastrointestinal obstruction
Autorzy:
Rachel, Franciszek
Łapiński, Andrzej
Szczerba, Dariusz
Gutterch, Krystian
Powiązania:
https://bibliotekanauki.pl/articles/1393568.pdf
Data publikacji:
2017
Wydawca:
Index Copernicus International
Tematy:
Congenital incomplete bowel rotation
obstruction
Ladd’s procedure
Opis:
The authors report a case of a 21-year-old patient with incomplete bowel rotation presenting with symptoms of chronic obstruction of the upper gastrointestinal tract and the diagnostic difficulties posed by the presented case. The decisive diagnostic examination consisted in an abdominal CT scan with contrast administration. The patient was successfully treated by means of Ladd's procedure.
Źródło:
Polish Journal of Surgery; 2017, 89, 3; 44-47
0032-373X
2299-2847
Pojawia się w:
Polish Journal of Surgery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A new method for decision making problems with redundant and incomplete information based on incomplete soft sets: From crisp to fuzzy
Autorzy:
Xia, Sisi
Chen, Lin
Liu, Siya
Yang, Haoran
Powiązania:
https://bibliotekanauki.pl/articles/2172131.pdf
Data publikacji:
2022
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
decision-making
soft set
incomplete fuzzy soft set
incomplete information
redundant information
podejmowanie decyzji
zbiór miękki
informacja niepełna
informacja zbędna
Opis:
This research is focused on decision-making problems with redundant and incomplete information under a fuzzy environment. Firstly, we present the definition of incomplete fuzzy soft sets and analyze their data structures. Based on that, binary relationships between each pair of objects and the “restricted/relaxed AND” operations in the incomplete fuzzy soft set are discussed. After that, the definition of incomplete fuzzy soft decision systems is proposed. To reduce the inconsistency caused by the redundant information in decision making, the significance of the attribute subset, the reduct attribute set, the optimal reduct attribute set and the core attribute in incomplete fuzzy soft decision systems is also discussed. These definitions can be applied in an incomplete fuzzy soft set directly, so there is no need to convert incomplete data into complete one in the process of reduction. Then a new decision-making algorithm based on the above definitions can be developed, which can deal with redundant information and incomplete information simultaneously, and is independent of some unreliable assumptions about the data generating mechanism to forecast the incomplete information. Lastly, the algorithm is applied in the problem of regional food safety evaluation in Chongqing, China, and the corresponding comparison analysis demonstrates the effectiveness of the proposed method.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2022, 32, 4; 657--669
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An incomplete soft set and its application in MCDM problems with redundant and incomplete information
Autorzy:
Xia, Sisi
Yang, Haoran
Chen, Lin
Powiązania:
https://bibliotekanauki.pl/articles/2055164.pdf
Data publikacji:
2021
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
soft set
incomplete soft set
incomplete information
redundant information
multiple criteria decision making
zbiór miękki
informacja niepełna
informacja zbędna
decyzja wielokryterialna
Opis:
Multiple criteria decision making (MCDM) problems in practice may simultaneously contain both redundant and incomplete information and are difficult to solve. This paper proposes a new decision-making approach based on soft set theory to solve MCDM problems with redundant and incomplete information. Firstly, we give an incomplete soft set a precise definition. After that, the binary relationships of objects in an incomplete soft set are analyzed and some operations on it are provided. Next, some definitions regarding the incomplete soft decision system are also given. Based on that, an algorithm to solve MCDM problems with redundant and incomplete information based on an incomplete soft set is presented and illustrated with a numerical example. The results show that our newly developed method can be directly used on the original redundant and incomplete data set. There is no need to transform an incomplete information system into a complete one, which may lead to bad decision-making due to information loss or some unreliable assumptions about the data generating mechanism. To demonstrate its practical applications, the proposed method is applied to a problem of regional food safety evaluation in Chongqing, China.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2021, 31, 3; 417--430
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Kazimierza Ajdukiewicza analiza syntaktyczna a problem wyrażeń niepełnych
Kazimierz Ajdukiewicz’s Syntactic Analysis and the Problem of Incomplete Expressions
Autorzy:
Popławski, Patryk
Powiązania:
https://bibliotekanauki.pl/articles/2083450.pdf
Data publikacji:
2020-12-31
Wydawca:
Uniwersytet Warszawski. Wydział Filozofii
Tematy:
Kazimierz Ajdukiewicz
syntactic analysis
incomplete expressions
natural language
ellipsis
Opis:
This paper discusses the problem of applying Kazimierz Ajdukiewicz’s method of syntactic analysis to incomplete expressions that occur in natural languages. The author defends the claim that it is impossible effectively to apply syntactic analysis to any expressions of natural languages, due to the presence of incomplete expressions. First, the author outlines the basic concepts and describes Ajdukiewicz’s selected views on incomplete expressions, as well as his method of syntactic analysis. Second, using the example of various types of incomplete expressions, the author presents problems that arise when syntactic analysis is applied to expressions of natural languages.
Źródło:
Filozofia Nauki; 2020, 28, 4; 39-60
1230-6894
2657-5868
Pojawia się w:
Filozofia Nauki
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Properties and pre-processing strategies to enhance the discovery of functional dependency with degree of satisfaction
Autorzy:
Wei, Q.
Chen, G.
Zhou, X.
Powiązania:
https://bibliotekanauki.pl/articles/970954.pdf
Data publikacji:
2009
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
functional dependency
incomplete data
degree of distinctness
data mining
Opis:
Functional dependency with degree of satisfaction (FDd) is an extended notion in data modeling, and reflects a type of integrity constraints and business rules on attributes, mainly for massive databases, in which incomplete data such as noise, null and imprecision may exist. While existing approaches are considered effective in general, attempts for further improvement in efficiency are deemed meaningful and desirable as far as knowledge discovery is concerned. This paper focuses on discovering (FDd)s as a form of useful semantic knowledge, aiming at providing an enhancement to the FDd mining process in a more efficient manner. In doing so, properties of FDd are in-depth investigated along with a measure for degree of distinctness. Subsequently, a number of optimization strategies are developed for pre-processing, which are then incorporated into the mining process, giving rise to an enhanced approach for mining functional dependency with degree of satisfaction, namely e-MFDD. Finally, data experiments revealed that e-MFDD significantly outperformed the original approach without pre-processing.
Źródło:
Control and Cybernetics; 2009, 38, 2; 367-394
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A note on incomplete regular tournaments with handicap two of order n ≡8 (mod 16)
Autorzy:
Froncek, D.
Powiązania:
https://bibliotekanauki.pl/articles/255455.pdf
Data publikacji:
2017
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
incomplete tournaments
handicap tournaments
distance magic labeling
handicap labeling
Opis:
A d-handicap distance antimagic labeling of a graph G = (V, E) with n vertices is a bijection ƒ : V → 1, 2,..., n } with the property that ƒ(xi) = i and the sequence of weights w(x1), w(x2),... , w(xn) (where [formula] ) forms an increasing arithmetic progression with common difference d. A graph G is a d-handicap distance antimagic graph if it allows a d-handicap distance antimagic labeling. We construct a class of k-regular 2-handicap distance antimagic graphs for every order n ≡8 (mod 16), n ≥56 and 6 ≥ k ≥ n — 50.
Źródło:
Opuscula Mathematica; 2017, 37, 4; 557-566
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 94

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