Temat: Mann-Whitney U test - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Efficiency of indirect ways of investing in commodities in conditions of polish capital market
Autorzy:: Krawiec, Monika
Powiązania:: https://bibliotekanauki.pl/articles/452871.pdf
Data publikacji:: 2011
Wydawca:: Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Katedra Ekonometrii i Statystyki
Tematy:: investing in commodities
indirect ways
Mann-Whitney U test
Opis:: Within last couple of years one could observe record levels of commodity prices and now commodity investments grow in popularity. Although there are possible direct and indirect ways of investing in commodities, the paper focuses on indirect investing through commodityrelated stocks and commodity funds. The research aims at assessing their efficiency in comparison to stock market, so the main index of Warsaw Stock Exchange (WIG) is a benchmark. There were calculated basic characteristics of considered assets and there were tested hypotheses of normality of their logarithmic returns and equality of their means and deviations from mean in relation to the benchmark. As no time series followed normal distribution, Mann-Whitney U test was applied.
Źródło:: Metody Ilościowe w Badaniach Ekonomicznych; 2011, 12, 1; 105-118
2082-792X
Pojawia się w:: Metody Ilościowe w Badaniach Ekonomicznych
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: A concept explanation on the development of wheel over point mathematical model for efficient course alteration
Autorzy:: Kamis, A. S.
Ahmad Fuad, A. F.
Powiązania:: https://bibliotekanauki.pl/articles/2063988.pdf
Data publikacji:: 2021
Wydawca:: Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:: wheel over point
IBM SPSS
ECDIS
efficient course alteration
mathematical model
altering of the course
Mann-Whitney U Test
Opis:: This concept paper described the process of bridging the gaps in one of the methods for determining wheel over point (WOP). WOP is a marking made on charted courses to indicate a point at which a ship should change course. Identifying WOP is vital to avoid the vessel overshooting the planned track. One method for determining WOP is the advanced transfer technique. However, two issues were identified while reviewing this technique. Therefore, an improved mathematical model could be developed to overcome these problems. A manoeuvring analysis using a ship simulator will be performed to test the developed mathematical model's efficacy. The data obtained from the simulation study can be validated further by its adherence to the cross track limit, reduction in percentage change, and using IBM SPSS for the Mann-Whitney U test. The developed mathematical model is expectantly capable of producing a better track-keeping function and suitable for use onboard a cargo ship. The mathematical model also could be implemented as an algorithm in the Electronic Chart Display and Information System to help navigators make more efficient course changes.
Źródło:: TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2021, 15, 3; 795--798
2083-6473
2083-6481
Pojawia się w:: TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Stopień i uwarunkowania internacjonalizacji polskich małych i średnich przedsiębiorstw
The Level and Determinants of Internationalization in Poland’s Small and Medium-Sized Enterprises
Autorzy:: Nowiński, Witold
Nowara, Wanda
Powiązania:: https://bibliotekanauki.pl/articles/574431.pdf
Data publikacji:: 2011-03-31
Wydawca:: Szkoła Główna Handlowa w Warszawie. Kolegium Analiz Ekonomicznych
Tematy:: internationalization
small and medium-sized enterprises (SMEs)
export intensity
geographical diversification
non-parametric Spearman correlation analysis
Mann-Whitney U test
multiple regression analysis
Opis:: The article deals with the determinants of the process of internationalization among small and medium-sized enterprises in Poland. In particular, Nowiński and Nowara set out to determine the relationship between the intensity of exports and the geographical diversification of exports, on the one hand, and variables such as the experience of companies on foreign markets, their size and the use of niche strategies, on the other. The analysis is based on empirical data obtained through a survey. Research methods used by the authors include non-parametric Spearman correlation analysis, Mann-Whitney U test, and multiple regression analysis. The results obtained show that the level of internationalization is related to factors such as company resources and skills as well as experience gained abroad-including both the experience of a company on export markets and experience brought to the company by international executives. The authors found a significant relationship between imports of intermediate goods and the level of internationalization of enterprises. On the other hand, there is no significant relationship between the level of internationalization and the size of a company, the authors say. Nowiński and Nowara conclude that the intensity of exports depends on factors such as a company’s export experience and the level of global integration in a sector, while the number of foreign markets targeted is less significant. Generally, the analyzed variables better reflect the intensity rather than geographical diversification of exports, the authors say.
Źródło:: Gospodarka Narodowa. The Polish Journal of Economics; 2011, 246, 3; 29-45
2300-5238
Pojawia się w:: Gospodarka Narodowa. The Polish Journal of Economics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: The Mann-Whltney test. Some problems concerning approximation of critical values and tied ranks
Test Manna-Whitneya. Problemy związane z aproksymacją wartości krytycznych i rangami wiązanymi
Autorzy:: Guraj-Kaczmarek, Kazimiera
Parys, Dariusz
Tomaszewicz, Andrzej S
Powiązania:: https://bibliotekanauki.pl/articles/905014.pdf
Data publikacji:: 1993
Wydawca:: Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:: Mann-Whitney test
approximation of critical values of Mann-Whitney
unconditional distribution of U-statistics
Opis:: The nonparametric Mann-Whitney test [Mann-Whitneу (1947)] is one of commonly used two sample tests. The problem of tied ranks exists in the case of discrete distributions. It makes the analysis of distribution of Mann-Whitney test quite complicated. There is continuing interest in the properties of this test's statistics. It can be seen from many of papers concerning the distribution of this statistic according to the assumption of equality of distributions about the critical values tables and test s power. In this paper we shall present an approximation of Mann-Whitney statistics, critical values, compared with the most often used approximation by normal distribution. We will determine the unconditional distribution of U-statistics for P=1/2 in the case of tied ranks. We will compare the interpolated quantiles of these distributions with the case of continuous distribution without the tied ranks.
Nieparametryczny test Manna-Whitneya (1947) należy do najczęściej stosowanych testów dla dwóch prób. W tym artykule prezentujemy dokładny aproksymację wartości krytycznych statystyki Manna-Whitneya w porównaniu z aproksymacją za pomocą rozkładu normalnego. Tablice 2 i 3 zawierają błędy aproksymacji dla 14 poziomów istotności. Obliczone kwantyle interpolowane, ich aproksymację za pomocą rozkładu normalnego oraz błędy aproksymacji dla czterech poziomów istotności prezentujemy w tablicach 4-7.
Źródło:: Acta Universitatis Lodziensis. Folia Oeconomica; 1993, 132
0208-6018
2353-7663
Pojawia się w:: Acta Universitatis Lodziensis. Folia Oeconomica
Dostawca treści:: Biblioteka Nauki

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