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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:
Change-point detection and trend analysis in monthly, seasonal and annual air temperature and precipitation series in Bartın province in the western Black Sea region of Turkey
Autorzy:
Yaman, Barbaros
Ertuğrul, Mertol
Powiązania:
https://bibliotekanauki.pl/articles/1841778.pdf
Data publikacji:
2020
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
climate change
homogeneity
precipitation
temperature
trend analysis
Opis:
Studies associated with climate change and variability are of great importance at both the global and local scale in the global climate crisis. In this study, change-point detection and trend analysis were carried out on mean, maximum, minimum air temperatures and total precipitation based on monthly, seasonal and annual scale in Bartın province located in the western Black Sea Region of Turkey. For this aim, 4-different homogeneity tests (von Neumann test, Pettitt test, Buishand range test and standard normal homogeneity test) for changepoint detection, Modified Mann–Kendall test and Şen’s innovative trend test for trend analysis, and Sen’s slope test for the magnitude estimation of trends were used. According to the test results, the summer temperatures in particular show increasing trends at the 0.001 significance level. Mean maximum temperature in August, mean minimum temperature in June and August, and mean temperature in July and August are in increasing trend at the 0.001 significance level. Over a 51 year period (1965–2015) in Bartın province, the highest rate of change per decade in air temperatures is in August (0.55°C for Tmax, 0.46°C for Tmin and 0.43°C for Tmean) based on Sen’s slope. However, the study showed that apart from October precipitation, there is no significant trend in monthly, seasonal and annual precipitation in Bartın. Increasing trends in mentioned climate variables are also visually very clear and strong in Şen’s innovative trend method, and they comply with the statistical results. As a result, the study revealed some evidence that temperatures will increase in the future in Bartın and its environs.
Źródło:
Geology, Geophysics and Environment; 2020, 46, 3; 223-237
2299-8004
2353-0790
Pojawia się w:
Geology, Geophysics and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Regression and Correlation Analysis of Labour and Resource Productivity Indicators Compared within the V4 Countries
Autorzy:
Jílková, Eva
Říhová, Veronika
Powiązania:
https://bibliotekanauki.pl/articles/1826066.pdf
Data publikacji:
2017-12-31
Wydawca:
Uniwersytet Przyrodniczo-Humanistyczny w Siedlcach
Tematy:
Labour efficiency, Productivity, Correlation, Regression analysis, Trend analysis
Opis:
The paper is focused on the evaluation of labour and resource productivity compared within the Visegrad countries in the time period 2010 - 2015. The aim of the paper is to identify certain relations and connections between the indicators of labour and material resource productivity and compare the V4 countries from the perspective of these indices. The authors use the methods of the correlation and regression analysis and development trends
Źródło:
Zeszyty Naukowe Uniwersytetu Przyrodniczo-Humanistycznego w Siedlcach; 2017, 42, 115; 171-183
2082-5501
Pojawia się w:
Zeszyty Naukowe Uniwersytetu Przyrodniczo-Humanistycznego w Siedlcach
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A comparative assessment of meteorological drought in the Tafna basin, Northwestern Algeria
Autorzy:
Bougara, Hanane
Baba-Hamed, Kamila
Borgemeister, Christian
Tischbein, Bernhard
Kumar, Navneet
Powiązania:
https://bibliotekanauki.pl/articles/2048629.pdf
Data publikacji:
2021
Wydawca:
Instytut Technologiczno-Przyrodniczy
Tematy:
drought
meteorological drought indices
Tafna basin
trend analysis
Opis:
The drought ranked first in terms the natural hazard characteristics and impacts followed by tropical cyclones, regional floods, earthquakes, and volcanoes. Drought monitoring is an important aspect of drought risk management and the assessment of drought is usually done through using various drought indices. The western region in Algeria is the most affected by the drought since the middle of the 70s.The current research focuses on the analysis and comparison of four meteorological drought indices (standardized precipitation index – SPI, percent of normal index – PN, decile index – DI, and rainfall anomaly index – RAI) in the Tafna basin for different time scales (annual, seasonal, and monthly) during 1979–2011. The results showed that the SPI and DI have similar frequencies for dry and wet categories. The RAI and PN were able to detect more drought categories. Meanwhile, all indices have strong positive correlations between each other, especially with Spearman correlation tests (0.99; 1.0), the meteorological drought indices almost showed consistent and similar results in the study area. It was determined in 1982 as the driest year and 2008 as the wettest year in the period of the study. The analysis of the trend was based on the test of Mann–Kendall (MK), a positive trend of the indices were detected on a monthly scale, this increasing of indices trend represent the increasing of the wet categories which explains the increasing trend of the rainfall in the last 2000s. These results overview of the understanding of drought trends in the region is crucial for making strategies and assist in decision making for water resources management and reducing vulnerability to drought.
Źródło:
Journal of Water and Land Development; 2021, 51; 78-93
1429-7426
2083-4535
Pojawia się w:
Journal of Water and Land Development
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of the stability of mercury concentrations in municipal waste using data science tools
Autorzy:
Jędrusiak, Radosław
Chuchro, Monika
Bielowicz, Barbara
Gielar, Agnieszka
Powiązania:
https://bibliotekanauki.pl/articles/2202857.pdf
Data publikacji:
2023
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
mercury
municipal waste
trend analysis
regression
seasonality
stability
Opis:
Mercury and its compounds are among the most dangerous and toxic substances in the environment. As part of the study, several exploratory analyses and statistical tests were conducted to demonstrate how low and stable mercury content is in municipal waste. A statistical analysis of the mercury content in waste (waste codes 19 12 12 and 20 03 01) was carried out using advanced IT tools. Based on 32 results for each waste, the maximum mercury concentration was 0.062 mg/kg dry weight (EWC code 19 12 12) and 0.052 mg/kg dry weight (EWC code 20 03 01). The analysis, data inference, and modeling were performed according to the CRISP-dm methodology. The results obtained were compared with the maximum allowable mercury concentrations for agricultural soils (2 mg/kg dry weight) and the provisions of the Minamata Convention (1 mg/kg). The average, median, and maximum observed mercury concentrations in waste are significantly lower than the assumed levels of 2 mg/kg (permissible concentrations for II-1 soils) and 1 mg/kg (Minamata Convention). The stability of mercury content in waste was examined. Descriptive statistics, statistical tests, and regression modeling were used. The tests and analyses performed showed an insignificant variation in the mercury content of the wastes with codes 19 12 12 and 20 03 01. No trend or seasonality was observed. The analyses and tests performed confirmed that the data are stable, and the values are low.
Źródło:
Geology, Geophysics and Environment; 2023, 49, 1; 71--83
2299-8004
2353-0790
Pojawia się w:
Geology, Geophysics and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Patterns and characterization of accidents and incidents reported in oil and gas industry in Norway
Autorzy:
Rahim, Y.
Kenett, R. S.
Powiązania:
https://bibliotekanauki.pl/articles/2069584.pdf
Data publikacji:
2010
Wydawca:
Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:
accident
incident
correspondence analysis
trend analysis
risk management
oil
gas
Opis:
Understanding the safety level of processes in any industry or any sector requires a situational analysis of current and future activities. This analysis includes identifying the hazards and sequence of events that can harm and lead to specific losses. Safety and risk levels are closely related to accident statistics. Accident/incident statistics and reporting systems enables enterprises and companies to identify risks, implement corrective measures’ and comply with the national requirements and standards on health safety and environment. The study describes how the accident statistics can be used as a basic tool for measuring the safety performance in oil and gas industry. The state of art in the literature in the field will be highlighted and analyzed with the summary of personal injury related statistics in Norwegian continental shelf is highlighted and analyzed.
Źródło:
Journal of Polish Safety and Reliability Association; 2010, 1, 1; 193--202
2084-5316
Pojawia się w:
Journal of Polish Safety and Reliability Association
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Trend analysis of the productivity of Nigerian seaports
Autorzy:
Nze, Obiageli N.
Okeudo, Geraldine N.
Ejem, Ejem Agwu
Powiązania:
https://bibliotekanauki.pl/articles/2141170.pdf
Data publikacji:
2021
Wydawca:
Fundacja Centrum Badań Socjologicznych
Tematy:
trend analysis
productivity
seaports
concessioning
technical efficiency
scale efficiency
Opis:
This paper assessed the trend of productivity of the existing six Nigerian ports. Secondary data was extracted from National Bureau of Statistics (NBS) Annual Reports, Nigeria Port Authority (NPA) Annual Reports, and Central Bank of Nigeria (CBN) Annual reports. Using the Data Envelopment Analysis technique, it was discovered that Calabar Port had been under-utilized towards the achievement of the required results. On the contrary, Rivers Port requires technical touches in her operations. As a liquid bulk port, the time of loading and discharging of commodities are often more than any other type of port and the turnaround time at this port are often more. Scale optimization is also required in Rivers Port. Inferentially, Lagos Port has been operating on optimal scale size but fluctuating managerial efficiency was experienced in the operation years. As a matter of findings, Tin Can Island has a similar trend to that of Onne Port with low productivities in the pre-concession period which improved consistently in the post-concession year of 2010 till the year 2015. It was also observed that Tin Can Island Port operated on under-utilization of inputs resources in the pre-concession periods till the post-concession year 2010. This reflects the element of wastefulness concerning both inputs and outputs quantities. Delta Port experienced fluctuating scale and technical efficiency trends in both pre and post concession years. Hence, it is observed that productivities' trends vary among the concessioned Nigerian Ports. These could be as a result of the influence of varied exogenous and endogenous factors on individual Port.
Źródło:
Journal of Sustainable Development of Transport and Logistics; 2021, 6, 2; 81-95
2520-2979
Pojawia się w:
Journal of Sustainable Development of Transport and Logistics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of trend changes in degree-day values of heating and cooling: broiler breeding case
Autorzy:
Yucel, A.
Atilgan, A.
Erdem, N.
Oz, H.
Powiązania:
https://bibliotekanauki.pl/articles/101664.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Infrastruktura i Ekologia Terenów Wiejskich PAN
Tematy:
broiler
linear regression analysis
spearman rank correlation test
temperature
trend analysis
Opis:
An ideal broiler house should be designed to minimize the effects of weather changes and to keep indoor conditions at the comfort temperature of the animals. In this case, this should be done with minimum cost and possible lowest operating costs. Degree-day methods are used in order to have knowledge of the energy need of any structure. With this method, the measured values or meteorological data can be used to give information about the heating and cooling energy quantities of structures. Depending on the climate change in recent years, the changes need to be examined that have taken place in order to provide optimum comfort in animal barn. Isparta province and districts were selected as the study area. The longterm average daily temperature values are used from meteorological stations of the selected region. The heating and cooling degree day values were calculated for selected balance temperatures in broiler breeding. Linear Regression Analysis and Spearman Rank Correlation Test were conducted to determine the changes of these values due to climate change. In conclusion, it was determined that there were statistically significant trends at 5% significance level in Egirdir (21°C), Isparta (31-29-25 and 23°C), Kasimlar (18°C), Senirkent (31-29-25-23 and 21°C), Sutculer (all selected balance temperature values) and Yalvac (31-29-25-23 and 21°C) in terms of heating degree-day values, and in Atabey (29-25-23-21 and 18°C), Barla (25-23 and 21°C), Isparta (23-21 and 18°C), Senirkent (29- 25-23-21 and 18°C), Sutculer (29-25-23-21 and 18°C), Sarkikaraagac (25-23-21 and 18°C), Uluborlu (25-23-21 and 18°C) and Yalvac (25-23-21 and 18°C) in terms of cooling degree-day values. As a result, it has been concluded that more energy consumption will be a concern for heating and cooling of the broiler house that will be built in the province of Isparta.
Źródło:
Infrastruktura i Ekologia Terenów Wiejskich; 2017, II/2; 645-660
1732-5587
Pojawia się w:
Infrastruktura i Ekologia Terenów Wiejskich
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Taksonomia dynamiki zmian struktury zatrudnienia w nowoczesnym przemyśle i usługach, w regionach Unii Europejskiej
The taxonomy of employment structure changes in modern industry and services in the European Union regions
Autorzy:
Markowska, Małgorzata
Strahl, Danuta
Sokołowski, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/439095.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Pedagogiczny im. Komisji Edukacji Narodowej w Krakowie
Tematy:
analiza trendu
NUTS 2
taksonomia dynamiczna
dynamic clustering
trend analysis
Opis:
Celem pracy jest analiza zmian udziału zatrudnionych w nowoczesnych, rozwiniętych technologicznie usługach i przemyśle w regionach Unii Europejskiej na poziomie NUTS 2. Wykorzystano dane z lat 1999–2008, kiedy były one w miarę kompletne i porównywalne. Dla każdej cechy osobno i dla każdego regionu oszacowano tendencję rozwojową. Współczynniki trendu potraktowano jako zmienne wejściowe do analizy taksonomicznej. Przy pomocy metody Warda zidentyfikowano liczbę grup regionów, różniących się modelem dynamiki zmian zatrudnienia w analizowanych sferach. Ostateczny podział regionów ze względu na dynamikę uzyskano przy pomocy metody k-średnich. Wyniki grupowania były weryfikowane przy pomocy jednoczynnikowej analizy wariancji. Na końcu ustalono modele dynamiki typowe dla wyróżnionych grup regionów.
The objective of the study is to analyze changes of employment share in modern, high-tech services and industry in the European Union regions at NUTS 2 level. The data covering the period of 1999–2008 were used since they are relatively complete and comparable. The growth tendency, separately for each quality/property and for each region, was estimated. Trend coefficients were used as input variables for the purposes of cluster analysis. By applying Ward’s method identified was the number of regional clusters, which differ by the model of employment changes dynamics in the analyzed spheres. The ultimate division of regions in terms of dynamics was obtained by using the k-means method. The results of clustering were verified by applying one-way analysis of variance. Finally the models of dynamics typical for the distinguished clusters of regions were specified.
Źródło:
Prace Komisji Geografii Przemysłu Polskiego Towarzystwa Geograficznego; 2014, 26; 46-64
2080-1653
Pojawia się w:
Prace Komisji Geografii Przemysłu Polskiego Towarzystwa Geograficznego
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Climate analysis as a basis for a sustainable water management at the Lusatian Neisse
Autorzy:
Pluntke, T.
Schwarzak, S.
Kuhn, K.
Lünich, K.
Adynkiewicz-Piragas, M.
Otop, I.
Miszuk, B.
Powiązania:
https://bibliotekanauki.pl/articles/108580.pdf
Data publikacji:
2016
Wydawca:
Instytut Meteorologii i Gospodarki Wodnej - Państwowy Instytut Badawczy
Tematy:
climate analysis
water availability
climate projections
trend analysis
Polish-Saxon border region
Opis:
Current and future climate conditions and their impact on water balance, ecosystems, air quality and bio and agro-climatology were investigated in the region of the Lusatian Neisse within the two EU -projects – NEYMO and KLAPS. This work focuses on the climate analysis of the region at the German-Polish border as a preliminary step for a hydrological analysis of current and future conditions. Observed climatological data were processed and analysed using the indicators air temperature, precipitation, sunshine duration, potential evapotranspiration and the climatic water balance (CWB). The latter defines the difference between precipitation and potential evapotranspiration and is a measure for the climatological water availability in the region. Observations were used to statistically downscale data from Global Circulation Models under various scenarios regarding greenhouse gas emissions (A1B, RCP 2.6, RCP 8.5) and applying the WETTREG-method for regionalization. In total, 50 climate projections for periods up until the end of the 21st century were analysed, with the application of the mentioned indicators. For the period 1971-2010, increasing trends of temperature, precipitation, sunshine duration and potential evapotranspiration were found. This leads to a reduced CWB in the summer half-year (SHY), which could be partly compensated by an increase in the winter half-year (WHY). Trends of temperature, sunshine duration and potential evapotranspiration remain positive for the far future (2071-2100), but precipitation decreases. These climatic conditions aggravate water availability, especially in the SHY. Impacts on water management are very probable and were therefore further investigated in the NEY MO project that applied hydrological models.
Źródło:
Meteorology Hydrology and Water Management. Research and Operational Applications; 2016, 4, 1; 3-11
2299-3835
2353-5652
Pojawia się w:
Meteorology Hydrology and Water Management. Research and Operational Applications
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-10 z 42

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