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Wyświetlanie 1-15 z 13604
Tytuł:
Global and local trend analysis and change-point analysis of selected financial and market indices
Autorzy:
Ballova, Dominika
Powiązania:
https://bibliotekanauki.pl/articles/384353.pdf
Data publikacji:
2019
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
trend analysis
change-point analysis
cluster analysis
Opis:
From the macroeconomic point of view, the stock index is the best indicator of the behavior of the stock market. Stock indices fulfill different functions. One of their most important functions is to observe developments of the stock market situation. Therefore, it is crucial to describe the long-term development of indices and also to find moments of abrupt changes. Another interesting aspect is to find those indices that have evolved in a similar way over time. In this article, using trend analysis, we will uncover the global evolution of selected indices. After evaluating the global trend in the series we compare the results with local trend analysis. Other goal is to detect the moments in which this development suddenly changed using the change-point analysis. By means of cluster analysis, we find those indices that are most similar in long-term development. In each analysis, we select the most appropriate methods and compare their results.
Źródło:
Journal of Automation Mobile Robotics and Intelligent Systems; 2019, 13, 3; 56-63
1897-8649
2080-2145
Pojawia się w:
Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An identification source of variation on the water quality pattern in the Malacca River basin using chemometric approach
Autorzy:
Hua, A. K.
Powiązania:
https://bibliotekanauki.pl/articles/204612.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
hierarchical cluster analysis
discriminant analysis
principal component analysis
multiple linear
regression analysis
Opis:
The Malacca River basin experienced river water pollution which caused a major deterioration to the ecosystems and environmental health. This study is carried out to assess the water quality data and identify the pattern of water pollution sources in the study area, and also to develop a predictive performance of water quality in the Malacca River basin. A chemometric approach using a combination of HCA, DA, PCA, and MLR, was applied into twenty water quality variables from nine sampling stations that were collected from January until December of 2015 in the river basin. HCA pointed out three clusters, namely Cluster 1 (C1) with low pollution source, Cluster 2 (C2) with moderate pollution source, and Cluster 3 (C3) with high pollution source. In the DA analysis, the results showed 21 variables, 12 variables, and 9 variables for standard mode, forward stepwise mode, and backward stepwise mode, respectively. Meanwhile, the PCA indicated that the main source of pollutants is detected from residential, industrial, commercial, agricultural, animal livestock, as well as forest land. Among the three models developed from MLR analysis, C3 with a high pollution source is detected to be the most suitable model to be used for the prediction of Water Quality Index in the Malacca River basin. This study proposed for an effective river water quality management by having new water quality monitoring network to be designed for more practical use in order to reduce time and effort, as well as cost saving purposes.
Źródło:
Archives of Environmental Protection; 2018, 44, 4; 111-122
2083-4772
2083-4810
Pojawia się w:
Archives of Environmental Protection
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Visualization investigation on the marine data with multivariate statistical analysis methods
Autorzy:
Li, Y.
Lu, Z.
Wang, M.
Powiązania:
https://bibliotekanauki.pl/articles/260477.pdf
Data publikacji:
2017
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
marine data
factor analysis
cluster analysis
discriminate analysis
visualization
Opis:
Marine information is an important way for us to know and study more about the ocean. Marine data makes the basic of marine information. Because of the huge quantity and diversity of marine data, and at the same time marine data is polyatomic variable, we start with statistical analysis methods to search for the regularity of the marine data. On one hand, we get the aggregate variation functions of the marine data by factor analyzing in aspect of the spatiality. Then we visually describe the marine status of the studied sea area with pre variogram function and post variogram function. On the other hand, we used cluster analysis method to get the verifying rule in time and make visible graphs of the marine data. In this way, we can also supply with the suggestions in classifying the sea seawater quality. The data processing result shows that the suggested methods in this article are both operable and effective. At the same time some reasonable suggestions are given in the article.
Źródło:
Polish Maritime Research; 2017, S 2; 89-94
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Macroeconomic Risk of Investment Portfolios at the Warsaw Stock Exchange
Ryzyko makroekonomiczne portfeli inwestycyjnych na GPW w Warszawie
Autorzy:
Jaguś, Felicjan
Powiązania:
https://bibliotekanauki.pl/articles/905058.pdf
Data publikacji:
2009
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
multidimensional statistic analysis
principal components analysis
cluster analysis
risk management
portfolio analysis
Opis:
The essay presents the attempt to examine selected macroeconomic risk factors of portfolio Investments in Polish capital market as well as to build investment portfolios sensitive to particular risk profiles. With this objective in view, quoted companies at WSE were classified in accordance lo selected macroeconomic risk factor, applying the multidimensional statistic analysis. On the basis of the classification the shares portfolios of different risk profiles were built. The principal components analysis was applied to specify the main macroeconomic risk factors. Next, for all assets individually multifactor regression models were built to describe relations between the return rates of the assets and the macroeconomic risk factors. As a result of the regression analysis the sensitivity risk measures were received. The clustering analysis was applied in order to classify the assets in accordance to the sensitivity risk measures. The result of classification was used to build the portfolios that are sensitive to specific of macroeconomic risks. Finally the influence of the specific macroeconomic risks on total investment risk was examined.
W pracy podjęto próbę oceny wybranych czynników ryzyka makroekonomicznego inwestycji portfel owej na polskim rynku kapitałowym. W tym celu przeprowadzono analizę klasyfikacji spółek ze względu na wybrane czynniki ryzyka makroekonomicznego, a następnie budowano portfele akcji o określonych profilach tego ryzyka. Badanie przeprowadzono na miesięcznych danych makroekonomicznych oraz miesięcznych stopach zwrotu spółek notowanych na GPW w Warszawie w okresie od stycznia 1999 do sierpnia 2005 r. Do specyfikacji ryzyka wykorzystano analizę głównych składowych. Wyznaczone składowe główne potraktowano jako czynniki ryzyka makroekonomicznego. Następnie oszacowano funkcje regresji opisujące stopy zwrotu akcji z wyznaczonymi czynnikami ryzyka. W wyniku analizy n presji otrzymano miary ryzyka wrażliwości stóp zwrotu spółek na poszczególne czynniki ryzyka makroekonomicznego. Następnie wykorzystano analizę skupień i dokonano klasyfikacji spółek ze względu na wyznaczone miary wrażliwości. Na podstawie wyników klasyfikacji zbudowano portfele akcji o określonych profilach makroekonomicznego ryzyka a następnie przeprowadzono analizę dywersyfikacji ryzyka portfeli. Ostatecznie zbadano wpływ poszczególnych czynników ryzyka na całkowite ryzyko inwestycji.
Źródło:
Acta Universitatis Lodziensis. Folia Oeconomica; 2009, 225
0208-6018
2353-7663
Pojawia się w:
Acta Universitatis Lodziensis. Folia Oeconomica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New lower bounds on the weighted chromatic number of a graph
Autorzy:
Caramia, Massimiliano
Fiala, Jirí
Powiązania:
https://bibliotekanauki.pl/articles/744465.pdf
Data publikacji:
2004
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
combinatorial analysis
computational analysis
optimization
Opis:
In this paper we present theoretical and algorithmic results for the computation of lower bounds on the chromatic number of a weighted graph. In particular, we study different ways of a possible improvement of the lower bound offered by a maximum weighted clique. Based on our findings we devise new algorithms and show their performance on random graphs.
Źródło:
Discussiones Mathematicae Graph Theory; 2004, 24, 2; 183-195
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Chemical composition of Dacyrodes edulis seed oil
Autorzy:
Okafor, N. A.
Ezim, O. E.
Anadebe, V. C.
Ume, C. S.
Powiązania:
https://bibliotekanauki.pl/articles/1113674.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Dacyrodis edulis seed
FTIR Analysis
GC-Analysis
Phytochemical Analysis
Opis:
Dacyrodes edulis seed were collected peeled, dried and powdered. The oil were extracted by simple method of cold extraction, the extracts were characterized by the Phytochemical analysis, Fourier transform infrared spectroscopy (FTIR) and Gas Chromatography (GC) to identify the fatty acid profile present in the seed oil. The FTIR analysis shows the variation of the peaks which indicate there is synergy among the functional groups of the extract. The phytochemical analysis revealed the presence of alkaloids, flavonoids, phenol, saponins, tannins and steroids, the study reveal the chemical constituents of Dacyrodes edulis seed oil that these constituents may be behind their medicinal values in phytomedicine.
Źródło:
World News of Natural Sciences; 2017, 14; 72-78
2543-5426
Pojawia się w:
World News of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Untypical cases and incorrect results of vibration tests
Autorzy:
Wiśniewski, W.
Powiązania:
https://bibliotekanauki.pl/articles/242412.pdf
Data publikacji:
2009
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
vibration tests
vibration analysis
resonance tests
resonance analysis
modal analysis
Opis:
The vibration analysis is the study of the behaviour and dynamic properties of mechanical structures under actuation by harmonic vibration forces. The aim of resonance tests of the structures is the experimental delimitation of frequencies and the modes of resonance vibrations. vibration analysis, or more precisely experimental vibration analysis, is the field of measuring and analyzing the dynamic response of mechanical structures when excited by a mechanical input. The broadly applied method of research relies on the harmonic actuation of vibrations and the measurement of respective parameters. Examples would include measuring the vibration of an aircraft load bearing structure when it is attached to an electromagnetic force actuator. Current vibration testing systems are composed of actuators set with their control and powering circuits, the vibration measurement transducers (typically accelerometers), an analog-to-digital converter to digitize analog instrumentation signals) and a system host computer to analyze the data and view it. The result of researcher own accumulated experiences and those experiences knownfrom the literature create the possibility for design o f a stochastic frame model describing, what type of resonances are possible to expect in the given or other type of structure. The cases submitted below became perceived and tested in the course of research of several aircraft, glider and helicopter designs in the Resonance Tests Program of the Institute of Aviation
Źródło:
Journal of KONES; 2009, 16, 1; 591-597
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wybrane rozwiązania instrumentalne w technikach analizy przepływowej
Selected instrumental solutions in flow analysis techniques
Autorzy:
Paluch, J.
Powiązania:
https://bibliotekanauki.pl/articles/134794.pdf
Data publikacji:
2016
Wydawca:
ADVSEO
Tematy:
Flow analysis
Flow injection analysis
Sequential injection analysis
FIA
SIA
Multicommutated Flow-Injection Analysis
Opis:
Modern analytical techniques are expected to fulfil high requirements in terms of both the quality of the obtained analytical results as well as caring for the environment. The methods should be developed in accordance with the rules of so-called Green Analytical Chemistry. Flow analysis techniques meet these assumptions. Their rapid development, especially in terms of instrumental solutions has been observed in recent years. Instrumental solutions employed in the flow analysis techniques allow for shortening the time of analyses, minimization of samples and reagents consumption as well as waste production, reduction of the costs of analyses and the risk of exposure of laboratory personnel on toxic substances. Their use, in many cases, has also a beneficial effect on improving the precision and accuracy of the analytical determinations. The article presents selected instrumental solutions used in various flow analysis techniques. Flow analysis techniques can be divided, inter alia, according to: the way of sample introduction into a flow system (continuous or intermittent sampling), the type of the liquid stream (segmented (with gas) or unsegmented flow) as well as the applied elements of instrumental system. In analytical practice, the techniques of flow injection analysis and sequential injection analysis are used most often. Due to constructional reasons, the use of systems containing valves of the type: Lab-on valve and various instrumental solutions of multicommutated techniques: multicommutated flow injection analysis, multi-syringe flow injection analysis and multi-pumping flow systems deserves special attention.
Źródło:
Technical Issues; 2016, 2; 45-52
2392-3954
Pojawia się w:
Technical Issues
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cluster analysis with clusterSim computer program and R environment
Zagadnienia analizy skupień z wykorzystaniem programu komputerowego clusterSim i środowiska R
Autorzy:
Walesiak, Marek
Powiązania:
https://bibliotekanauki.pl/articles/907036.pdf
Data publikacji:
2008
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
cluster analysis
R
clusterSim
data analysis
Opis:
The article presents auxiliary functions of clusterSim package (see Walesiak & Dudek (2006)) and selected functions of packages stats, cluster, and ade4, which are applied to solving clustering problems. In addition, the examples of the procedures for solving different clustering problems are presented. These procedures, which are not available in statistical packages (SPSS, Statistica, SAS), can help solving a broad range of classification problems.
W artykule scharakteryzowano funkcje pomocnicze pakietu clusterSim oraz wybrane funkcje pakietów stats, cluster i ade4 służące zagadnieniu analizy skupień. Ponadto zaprezentowano przykładowe procedury, wykorzystujące analizowane funkcje, ułatwiające potencjalnemu użytkownikowi realizację wielu zagadnień klasyfikacyjnych niedostępnych w podstawowych pakietach statystycznych (np. SPSS, Statistica, SAS).
Źródło:
Acta Universitatis Lodziensis. Folia Oeconomica; 2008, 216
0208-6018
2353-7663
Pojawia się w:
Acta Universitatis Lodziensis. Folia Oeconomica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cluster Analysis as a Tool for Strategic Analysis at the State Level
Autorzy:
Dawidczyk, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/1375052.pdf
Data publikacji:
2020
Wydawca:
Wyższa Szkoła Policji w Szczytnie
Tematy:
security methodology
strategic analysis
cluster analysis
Opis:
The article presents the evolution of the idea of approach to conducting strategic analysis of the state’s environment, used to assess its functioning in the existing and forecasted conditions, which can also be used in the analysis conducted at lower levels of administration. The author presents one of the methods of strategic analysis used in the process of strategic planning in the field of national security. This method can also be successfully used when designing a defence strategy or police development strategy, as it precedes the process of formulating objectives and action concepts. According to the author, the advantages of the proposed method called cluster analysis are its universality, transparency and simplicity of application. The proposed method was preceded by reflections on the issues of strategic analysis related to the current practice of strategic planning in Poland, as well as similar to the presented taxonomic method, to finally focus the reader’s attention on cluster analysis, a mathematical method of data grouping, which can be a proposal to conduct strategic analysis at the level of the state and its institutions.
Źródło:
Internal Security; 2020, 12(1); 97-111
2080-5268
Pojawia się w:
Internal Security
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A new mathematical model for analytical risk assessment and prediction in IT systems
Autorzy:
Fray, I. E.
Kurkowski, M.
Pejaś, J.
Maćków, W.
Powiązania:
https://bibliotekanauki.pl/articles/206238.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
risk analysis
risk analysis methods
formal model for risk analysis
Opis:
In this paper, we propose a new formal model to describe risk analysis and measurement process for IT systems. Our model complies with international standards and recommendations for non-profit organisations. The model accounts for solutions used in widely known and recommended risk analysis methods and provides for evaluation of efficacy of these solutions. A simple example illustrates the application of the proposed model for effective risk analysis of any IT system.
Źródło:
Control and Cybernetics; 2012, 41, 1; 241-268
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ocena stanu i jakości polskiego szkolnictwa wyższego z wykorzystaniem metod wap
Evaluation of state and qualityof higher education system using methodsof multivariate statistical analysis
Autorzy:
Targaszewska, Marta
Powiązania:
https://bibliotekanauki.pl/articles/425006.pdf
Data publikacji:
2013
Wydawca:
Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu
Tematy:
multivariate statistical analysis
cluster analysis
correspondence analysis
quality
higher education
Opis:
The paper presents the results of comparative analysis of quality and higher education system in Poland. The cluster analysis was used to group the voivodeships of Poland. The correspondence analysis allowed to attempt at verifying quality of higher education in each cluster and at explaining what the highest rated type of academic institution in Poland is.
Źródło:
Econometrics. Ekonometria. Advances in Applied Data Analytics; 2013, 2(40); 36-47
1507-3866
Pojawia się w:
Econometrics. Ekonometria. Advances in Applied Data Analytics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Recognition and determination of related traits importance with seed yield in chickpea (Cicer aietinum)
Autorzy:
Ghorbani, Tayebeh
Cheghamirza, Kianoosh
Bardideh, Kosar
Shoar, Parastoo Basiri
Powiązania:
https://bibliotekanauki.pl/articles/2199728.pdf
Data publikacji:
2013-12-19
Wydawca:
Instytut Hodowli i Aklimatyzacji Roślin
Tematy:
chickpea
factor analysis and cluster analysis
path analysis
yield
yield components
Opis:
To study the relationship between seed yield and its components 5 varieties and 18 different genotypes of Cicer arietinum were evaluated. This study was carried out under dryland farming during 2007 in research farm of Razi university. Path analysis showed that in the first level of yield, the highest direct effect was related to biological yield and the highest indirect effect was related to seed number per plant due to biological yield. In second level of yield due to the seed number per plant double seed pod number had the highest direct effect and the highest indirect effect was related to hundreds seed weight due to double the seed pod number. In second level of yield due to biological yield, the highest direct effect was related to high plant and the highest indirect effect was related to high plant due to second branch number. In the third level of yield due to a hundred seed weight, the highest direct effect was related to pod diameter and the highest indirect effect was related to pod length due to pod diameter. Factor analysis showed that 5 factors explained 81.65 percent of the variance. Cluster analysis based on ward method were arranged genotypes in 3 clusters.
Źródło:
Plant Breeding and Seed Science; 2013, 68; 15-24
1429-3862
2083-599X
Pojawia się w:
Plant Breeding and Seed Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Tell me where you are and I’ll tell you what you learn. Investigating hidden curricula using GIS analysis of place names in a case study of an English language textbook published in Japan
Autorzy:
Wacławik, Paulina
Gozdawa-Gołębiowski, Romuald
Powiązania:
https://bibliotekanauki.pl/articles/29433650.pdf
Data publikacji:
2023-10-26
Wydawca:
Oddział Kartograficzny Polskiego Towarzystwa Geograficznego
Tematy:
textbook analysis
digital humanities
GIS analysis
Opis:
The article aims to look for a way to geographically delineate the notion of target culture in the language textbook “The World We Live in” by Ogasawara et al. (2013) published in Japan for Japanese students and teachers. Looking at the textbooks as cultural artefacts, we identified geographical space within the scope of the sample textbook and analysed the pedagogical context the place names appeared in. By doing that we attempt to find the spatial bias of the book, which is a manifestation of values there inscribed, often called the “hidden curriculum”. The elaborated method, following a seminal study by Risager (2018), is an attempt to adapt the proposed content analysis of the textbooks into GIS tools in order to capture the geographic dimension of the content. The method serves as a stepping stone towards the creation of a model to analyse and identify the attitudes toward the cultural content of educational materials. This will not only enable a more authentic classroom experience responding to the needs of particular groups of students and teachers but also look for ways to make the textbooks more inclusive.
Źródło:
Polish Cartographical Review; 2023, 55, 1; 11-23
2450-6974
Pojawia się w:
Polish Cartographical Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of conjoint analysis in the study of the wine consumers’ preferences
Zastosowanie conjoint analysis w badaniu preferencji konsumentów wina
Autorzy:
Wasilewska, E.
Dudzinski, M.
Powiązania:
https://bibliotekanauki.pl/articles/2053351.pdf
Data publikacji:
2019
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
preferences analysis
consumer
conjoint analysis
wine
Opis:
In our paper, the results concerning the research devoted to wine consumers’ preferences, obtained with the use of method called the conjoint analysis, are presented. The basis for measurements of such the preferences is the utility function that enables to assign numerical characteristics to each of available variates. The conjoint analysis is a survey-based multivariate statistical technique where respondent has different objects at the disposal, each of which is determined by the chosen set of relevant attributes, taking the given values (levels), in order to give some information about the total preferences regarding these objects. The objective of our work is to gain the knowledge about the wine consumers’ preferences and, in particular, to establish what factors are vital for them when purchasing wine. We conduct a questionnaire survey based on a sample consisting of 248 randomly chosen respondents, declaring wine consumption. The collected sample has been divided into the female and male groups, as well as into the three age categories (18–35 years, 36–55 years and 56 years or more). In our study, we have stated that the price of wine is the most decisive factor when it comes to selection of the preferred sort of wine. The wine dryness and its color turn out to be the second and the third most signifi cant factors regarding this choice, while the sort of wine and the number of awarded prizes or accolades are the least important factors for buying the specifi c kind of wine.
Źródło:
Zeszyty Naukowe Szkoły Głównej Gospodarstwa Wiejskiego. Ekonomika i Organizacja Gospodarki Żywnościowej; 2019, 126; 53-68
2081-6979
Pojawia się w:
Zeszyty Naukowe Szkoły Głównej Gospodarstwa Wiejskiego. Ekonomika i Organizacja Gospodarki Żywnościowej
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 13604

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