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Tytuł:
Nonparametric tests for the two-sample location problem
Autorzy:
Grzegorzewski, Przemysław
Powiązania:
https://bibliotekanauki.pl/articles/748118.pdf
Data publikacji:
1991
Wydawca:
Polskie Towarzystwo Matematyczne
Tematy:
Hypothesis testing
Opis:
.
Let X1,X2,...,Xm and Y1,Y2,...,Yn be two independent random samples from populations with continuous distribution functions F(x) and G(x)=F(x - ) respectively. In order to test H: =0 against K:A>0 several tests can be used. Thirteen such nonparametric tests are presented here. By means of a sampling study a comparison of these tests are performed. The criteria of the power and the power index was used. Related problems are discussed as well. An algorithm (in Pascal) for computation of the critical level of the Mann-Whitney- Wilcoxon test is given also.
Źródło:
Mathematica Applicanda; 1991, 20, 34
1730-2668
2299-4009
Pojawia się w:
Mathematica Applicanda
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bias of certain tests for the two-sample problem
Autorzy:
Hellmann, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/748236.pdf
Data publikacji:
1980
Wydawca:
Polskie Towarzystwo Matematyczne
Tematy:
Hypothesis testing
Opis:
.
Let X1,⋯,Xn and Y1,⋯,Yn be two independent samples from cumulative distribution functions F and G, respectively. The author discusses the problem of unbiasedness of certain rank tests in the context of verifying H0:F=G against one of the "two-sided'' alternatives H1:F≠G; H2:P(X>Y)
Źródło:
Mathematica Applicanda; 1980, 8, 16
1730-2668
2299-4009
Pojawia się w:
Mathematica Applicanda
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An accurate test for testing the Hardy-Weinberg equilibrium hypothesis
Autorzy:
Gnot, Stanisław
Matej, Henryk
Szulga, Teofil
Powiązania:
https://bibliotekanauki.pl/articles/748793.pdf
Data publikacji:
1979
Wydawca:
Polskie Towarzystwo Matematyczne
Tematy:
Genetics,Hypothesis testing
Opis:
Zbl 0465.62098; MR0549989
The paper includes uniformly most powerful unbiased test for a genetic model with two possible kinds of genes. This test is constructed on the basis of general theory of testing linear hypotheses for families of exponential distributions. An example of application for the system MN of blood-groups is given. Zbl 0465.62098; MR0549989
Źródło:
Mathematica Applicanda; 1979, 7, 15
1730-2668
2299-4009
Pojawia się w:
Mathematica Applicanda
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nonlinear homogenization of heterogeneous periodic plates of Reissner-Mindlin type
Autorzy:
Pruchnicki, Erick
Powiązania:
https://bibliotekanauki.pl/articles/1839643.pdf
Data publikacji:
2020
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
homogenization
plate
nonlinear hypothesis
Opis:
In this paper, we propose a multiscale finite-strain plate theory for a composite nonlinear plate described by a repetitive periodic heterogeneity. We consider two scales, the macroscopic scale is linked to the entire plate and the microscopic scale is linked to the size of the heterogeneity. At the macroscopic scale, we approximate the displacement field by the Reissner-Mindlin model. By considering the equivalence between variations of the macroscopic elastic energy at each point of the mid surface and the microscopic one, we deduce that the macroscopic stress resultants can be expressed in terms of the microscopic stress.
Źródło:
Journal of Theoretical and Applied Mechanics; 2020, 58, 2; 317-323
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Czy schizofrenia jest chorobą neuodegeneracyjną, czy neurorozwojową?
Is schizophrenia a neurodegenerative or neurodevelopmental disease?
Autorzy:
Rabe-Jabłońska, Jolanta
Powiązania:
https://bibliotekanauki.pl/articles/945685.pdf
Data publikacji:
2005
Wydawca:
Medical Communications
Tematy:
dowody
evidence
hipoteza neurodegeneracyjna
hipoteza neurorozwojowa
neurodegenerative hypothesis
neurodevelopmental hypothesis
schizofrenia
schizophrenia
Opis:
According to the neurodevelopmental theory, etiological and pathological factors of a disease occur long before its symptoms. Cessation of the normal course of neuronal development causes disorders in their function and neuronal network, whereas after latency it leads to clinical manifestation of symptoms. In neurodegenerative diseases the specifically pathophysiological process, usually conditioned genetically, impairs selectively the ”sensitive” population of neurons and causes neuropathological symptoms and changes. The course and nature of these dysfunctions depend on superimposing of the pathological process on the normal process of development and puberty, and on individual plasticity and compensatory processes in the central nervous system. Schizophrenia meets some of these criteria, but it does not fit into the narrow definition of neurodegenerative diseases. So far no histopathological, immunocytochemical changes have been found, which would allow to identify the disease. However as early as during the first episode, most patients exhibit some characteristics of clinical deterioration, afterwads the status of most of them gets stabilized at a certain level of cognitive and social functioning, whereas in some patients the severity of the disease and cognitive dysfunctions gradually progress. The progression of schizophrenic process is also reflected in evolution of symptoms in the course of the disease, in biochemical and anatomical changes of the central nervous system. Presently, the neurodegenerative hypothesis of schizophrenia cannot be rejected. It may appear true only in a part of the patients with specific course of the disease, and in some cases neurodegeneration may be superimposed on neurodevelopmental disorders.
Zgodnie z teorią neurorozwojową etiologiczne i patologiczne czynniki choroby występują na długo przed jej objawami. Przerwanie prawidłowego przebiegu rozwoju neuronalnego powoduje zaburzenia ich funkcji oraz sieci neuronalnej, a po okresie latencji doprowadza do klinicznej manifestacji objawów. W chorobach neurodegeneracyjnych specyficzny patofizjologiczny proces, najczęściej uwarunkowany genetycznie, uszkadza selektywnie „wrażliwą” populację neuronów i wywołuje symptomy i zmiany neuropatologiczne. Przebieg w czasie i natura tych dysfunkcji zależy od nałożenia się procesu chorobowego na normalny proces rozwojowy i dojrzewania, a także od indywidualnej plastyczności i procesów kompensacyjnych w OUN. Schizofrenia spełnia niektóre z tych kryteriów, lecz nie mieści się w wąskiej definicji chorób neurodegeneracyjnych. Nie stwierdzono do tej pory zmian histopatologicznych, immunocytochemicznych pozwalających identyfikować schorzenie. Jednak już w okresie I epizodu większość chorych ma cechy klinicznej deterioracji, po czym u wielu z nich stan stabilizuje się na pewnym poziomie funkcjonowania poznawczego i społecznego, natomiast u części pacjentów nasilenie choroby i dysfunkcje poznawcze stopniowo postępują. Progresja procesu schizofrenicznego znajduje także odbicie w ewolucji objawów w miarę przebiegu choroby, zmianach biochemicznych, anatomicznych w OUN. Obecnie nie można odrzucić hipotezy neurodegeneracyjnej schizofrenii. Może się okazać prawdziwa tylko u części chorych ze specyficznym przebiegiem choroby, a w niektórych przypadkach neurodegeneracja może nakładać się na zaburzenia neurorozwojowe.
Źródło:
Psychiatria i Psychologia Kliniczna; 2005, 5, 3; 117-125
1644-6313
2451-0645
Pojawia się w:
Psychiatria i Psychologia Kliniczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The adaptive market hypothesis and the return predictability in the cryptocurrency markets
Autorzy:
Karasiński, Jacek
Powiązania:
https://bibliotekanauki.pl/articles/2192168.pdf
Data publikacji:
2023-04-27
Wydawca:
Uniwersytet Ekonomiczny w Poznaniu
Tematy:
cryptocurrency markets
adaptive market hypothesis
efficient market hypothesis
cryptocurrency return predictability
weak-form efficiency of cryptocurrency markets
martingale difference hypothesis
Opis:
This study employs robust martingale diefrence hypothe sis tests to examine return predictability in a broad sample of the 40 most capitalized cryptocurrency markets in the context of the adaptive market hypothesis. The tests were applied to daily returns using the rolling window method in the research period from May 1, 2013 to September 30, 2022. The results of this study suggest that the returns of the majority of the examined cryptocurrencies were unpredictable most of the time. However, a great part of them also suefred some short periods of weak-form ineficien cy. The results obtained validate the adaptive market hy pothesis. Additionally, this study allowed the observation of some diefrences in return predictability between the examined cryptocurrencies. Also some historical trends in weak-form eficiency were identifed. The results suggest that the predictability of cryptocurrency returns might have decreased in recent years also no significant relation ship between market cap and predictability was observed. JEL codes: G14
Źródło:
Economics and Business Review; 2023, 9, 1; 94-118
2392-1641
Pojawia się w:
Economics and Business Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Random walks and market efficiency tests: evidence on US, Chinese and European capital markets within the context of the global Covid-19 pandemic
Autorzy:
Dias, Rui
Teixeira, Nuno
Machova, Veronika
Pardal, Pedro
Horak, Jakub
Vochozka, Marek
Powiązania:
https://bibliotekanauki.pl/articles/19233559.pdf
Data publikacji:
2020
Wydawca:
Instytut Badań Gospodarczych
Tematy:
COVID-19
capital market
random walk hypothesis
efficient market hypothesis
arbitration
portfolio diversification
Opis:
Research background: Covid-19 has affected the global economy and has had an inevitable impact on capital markets. In the week of February 24-28, 2020, stock markets crashed. The index FTSE 100 decreased 13%, while the indices DJIA and S&P 500 fell 11-12%, the biggest drop since the 2007-2008 financial and economic crisis. It is therefore of interest to test the random walk hypothesis in developed capital markets, European and also non-European, in order to understand the different predictabilities between them. Purpose of the article: The aim is to analyze capital market efficiency, in its weak form, through the stock market indices of Belgium (index BEL 20), France (index CAC 40), Germany (index DAX 30), USA (index DOW JONES), Greece (index FTSE Athex 20), Spain (index IBEX 35), Ireland (index ISEQ), Portugal (index PSI 20) and China (index SSE) for the period from December 2019 to May 2020. Methods: Panel unit root tests of Breitung (2000), Levin et al. (2002) and Hadri (2002) were used to assess the time series stationarity. The test of Clemente et al. (1998) is used to detect structural breaks. The tests for the random walk hypothesis follows the variance ratio methodology proposed by Lo and MacKinlay (1988). Findings & Value added: In general, we found mixed confirmation about the EMH (efficient market hypothesis). Taking into account the conclusions of the rank variance test, the random walk hypothesis was rejected in the case of stock indices: Dow Jones, SSE and PSI 20, partially rejected in the case indices: BEL 20, CAC 40, FTSTE Athex 20 and DEX 30, but accepted for indices: IBEX 35 and ISEQ. The results also show that prices do not fully reflect the information available and that changes in prices are not independent and identically distributed. This situation has consequences for investors, since some returns can be expected, creating opportunities for arbitrage and for abnormal returns, contrary to the assumptions of random walk and information efficiency.
Źródło:
Oeconomia Copernicana; 2020, 11, 4; 585-608
2083-1277
Pojawia się w:
Oeconomia Copernicana
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of lubricating oil improvers on performance of crankshaft seals
Autorzy:
Bzura, P.
Powiązania:
https://bibliotekanauki.pl/articles/260544.pdf
Data publikacji:
2018
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
performance
scientific hypothesis
sealing systems
Opis:
This paper presents an original method for checking influence of lubricating oil improvers on performance of crankshaft seals of combustion piston engine. Crankshaft seals were tested with the use of a modified friction node of T-02 fourball apparatus in laboratory conditions. The tests were conducted according to a worked-out algorithm. Their results confirmed usefulness of the method for determining „harmful” performance of sealing systems, which makes it possible to assess operational usability of lubricating oil improvers. On the basis of an analysis of the results a scientific hypothesis saying that lubricating oil quality affects correctness of performance of crankshaft seals of combustion piston engine, was formulated. The hypothesis was verified by means of induction inference and statistical method with taking into account Fisher statistics.
Źródło:
Polish Maritime Research; 2018, S 1; 172-177
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cięcia budżetowe. Przegląd najnowszych badań
Austerity at the Treasury. A review of the recent literature
Autorzy:
Maziarz, Mariusz
Powiązania:
https://bibliotekanauki.pl/articles/569888.pdf
Data publikacji:
2016
Wydawca:
Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu
Tematy:
public debt
economic growth
expansionary fiscal contraction hypothesis
threshold hypothesis
Reinhart-Rogoff affair
austerity
Opis:
The goal is analyzing the most recent cliometric literature on two hypotheses connected to one of the most fiercing problems of the world economy, i.e. historically highest levels of public debt. The author focuses on research published after 2009 aimed at assessing the 90% threshold hypothesis and the expansionary fiscal contraction hypothesis. The opinions among cliometricians are vastly divided. The author concludes that (1) a great dose of scepticism is needed in assessing the recent empirical findings, (2) the 90% threshold hypothesis is not proven, (3) austerity at the Treasure should take place after a recession ends due to possible contractionary influence and (4) it should be based on spending cuts rather than tax increases.
Źródło:
Ekonomia XXI Wieku; 2016, 2 (10); 9-21
2353-8929
Pojawia się w:
Ekonomia XXI Wieku
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Robustness of two-sample tests to a dependency of observations
Autorzy:
Zieliński, Ryszard
Powiązania:
https://bibliotekanauki.pl/articles/747896.pdf
Data publikacji:
1990
Wydawca:
Polskie Towarzystwo Matematyczne
Tematy:
Robustness and adaptive procedures
Hypothesis testing
Opis:
.
In the paper, a numerical analysis of robustness of Student f-test, Wilcoxon-Mann-Whitney test and a sign test to some dependencies of observations is presented. A Monte Carlo approach has been applied.
Źródło:
Mathematica Applicanda; 1990, 18, 32
1730-2668
2299-4009
Pojawia się w:
Mathematica Applicanda
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Coming Home to Paganism: Theory of Religious Conversion or a Theological Principle?
Autorzy:
Anczyk, Adam
Vencálek, Matouš
Powiązania:
https://bibliotekanauki.pl/articles/640954.pdf
Data publikacji:
2013-12-15
Wydawca:
Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego
Tematy:
Neo-Paganism
Homecoming Hypothesis
Religious Conversion
Opis:
The so-called “homecoming” is one of the most (if not the most) popular ways of depicting the process of becoming a follower of Neo-Paganism found in literature, from Margot Adler’s classical Drawing Down the Moon (1979) to contemporary authors, like Graham Harvey. It is interesting that “homecoming” simultaneously occurs in Neo-Pagan literature, as the common way of becoming Pagan, seen as opposite to the process of conversion (usually as a rapid change of religious beliefs). The critique of the “homecoming” defined in the academic field concentrates on showing that there is a possibility it may be more a theological notion, rather than a model of religious change to contemporary Paganism. The broad definition of religious conversion, understood as change in religious behaviour and beliefs, does include “homecoming” as one of the possible conversion narratives. Therefore, we may speak of a “coming home experience” as one of the main themes – but certainly not the only one – that is present in the histories of conversion to contemporary Paganism
Źródło:
Studia Religiologica; 2013, 46, 3; 161-171
0137-2432
2084-4077
Pojawia się w:
Studia Religiologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Polki w Norwegii – decyzje i plany prokreacyjne
Autorzy:
Łobodzińska, Anna
Powiązania:
https://bibliotekanauki.pl/articles/1827713.pdf
Data publikacji:
2016-06-10
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Poles in Norway
childbearing decisions
childbearing intentions
disruption hypothesis
interrelation of events hypothesis
fertility after migration
Opis:
Given the scale and pace of post-EU accession migrations from Poland, as well as age and gender structure of their participants, an increased interest in family behaviour and intentions of this group has been recently noted. The observed interrelations between migration and family building processes are multidimensional. Thus, this study aims to investigate interrelations between migration, childbearing decisions and intentions of Polish female migrants in Norway. The paper is based on a survey research conducted among Polish female migrants in 2014–2015. The results show that majority of immigrants was childless upon arrival. For those, who had a child before migration, the mobility occurred in a relatively early stage of family formation process. However, a concentration of births shortly after migration can be observed. This concerns mostly women migrating to join their husbands or partners. An opposite evidence is observed regarding respondents who had one child upon arrival to Norway – only few of them proceeded to the second birth. Almost 58% of respondents wants to give birth to their next child in Norway. More importantly, majority of women planning a long-term stay in Norway still has positive or uncertain childbearing intentions.
Źródło:
Studia Demograficzne; 2016, 169, 1; 39-63
0039-3134
Pojawia się w:
Studia Demograficzne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thinking and Morality as a Form of Cooperation in the Light of the Conception of Michael Tomasello
Autorzy:
Żuromski, Daniel
Powiązania:
https://bibliotekanauki.pl/articles/1996835.pdf
Data publikacji:
2017-06-30
Wydawca:
Wydawnictwo Adam Marszałek
Tematy:
the Interdependence Hypothesis
the Shared Intentionality Hypothesis
Michael Tomasello
the natural history of human morality
Opis:
In his work A Natural History of Human Thinking, Michael Tomasello depicts thinking as a form of cooperation. Presenting at the same time a conceptual schema enriched with empirical data, he outlines a natural history of thinking in particular, indicating how the process of socialization and new, unique manifestations of human interaction alter the forms of thinking, from the ones we share with primates, through increasingly complex forms characteristic of the primitive man, to these of the contemporary man. In A Natural History of Human Morality Tomasello presents a similar structure, showing morality as a form of human cooperation in which, according to Tomasello, Homo sapiens, seen as “ultra-social primates”, developed new and uniquely human forms of social interaction and organization which, as a result, required new and also very specific for Homo sapiens psychological mechanisms in cognitive processes, social interaction and self-control. While in A Natural History of Human Thinking Tomasello’s main hypothesis is the Shared Intentionality Hypothesis, in A Natural History of Human Morality it is the Interdependence Hypothesis. Thus, this unique structure of abilities and motivation is the feature which distinguishes us from other primates. This essay aims to extract and outline this structure, focusing more on A Natural History of Human Morality.
Źródło:
Kultura i Edukacja; 2017, 2(116); 69-81
1230-266X
Pojawia się w:
Kultura i Edukacja
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Information about dynamics of the sea surface as a means to improve safety of the unmanned vessel at sea
Autorzy:
Przyborski, M.
Powiązania:
https://bibliotekanauki.pl/articles/259934.pdf
Data publikacji:
2016
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
hypothesis testing
nonlinearity
sea dynamics
USV
Opis:
One of the fundamental states of the sea surface is its heave. Despite of years of the intense scientific inquiry, no clear understanding of the influence of this aspect on the dynamics of the sea environment has emerged. The separation of two nearby fluid elements which one may observed for example as a free floating of small objects on the sea surface (rescuers on the rough sea or small research vessels) is caused by the interaction of different components. On the other hand one may say that the heave of the sea is also a summary interaction of a few components describing the dynamics of the sea. Therefore it is the most important aspect, which influenced the dispersion phenomenon. This observation has important consequences for many different problems as for example conducting Search and Rescue missions and using unmanned ships. We would like to present results of our experiment focused on finding the answer to question about nature of the heave of the sea and its influence on safety of Unmanned Surface Vessels (USV).
Źródło:
Polish Maritime Research; 2016, 4; 3-7
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 242

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