Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

English (EN)·Polski (PL)·Yкраїнський (UK)
Przejdź do strony domowej biblioteki Centralna Biblioteka Wojskowa Link otwiera się w nowym oknie Logo biblioteki Prolib Integro - strona głównaCentralna Biblioteka Wojskowa

Wyszukujesz frazę "correlation coefficient" wg kryterium: Temat

  Lista filtrów

Dostawca treści

Wyrównaj
Wyświetlanie 1-25 z 86
Tytuł:
A note on correlation coefficient between random events
Autorzy:
Stępniak, Czesław
Powiązania:
https://bibliotekanauki.pl/articles/729754.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
correlation coefficient between random events
correlation coefficient for random variables
synergy phenomenon
Opis:
Correlation coefficient is a well known measure of (linear) dependence between random variables. In his textbook published in 1980 L.T. Kubik introduced an analogue of such measure for random events A and B and studied its basic properties. We reveal that this measure reduces to the usual correlation coefficient between the indicator functions of A and B. In consequence the resuts by Kubik are obtained and strenghted directly. This is essential because the textbook is recommended by many universities in Poland.
Źródło:
Discussiones Mathematicae Probability and Statistics; 2015, 35, 1-2; 57-60
1509-9423
Pojawia się w:
Discussiones Mathematicae Probability and Statistics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On two confidence intervals for the correlation coefficient
O dwóch przedziałach ufności dla współczynnika korelacji
Autorzy:
Tarasinska, J.
Powiązania:
https://bibliotekanauki.pl/articles/9709.pdf
Data publikacji:
2008
Wydawca:
Uniwersytet Przyrodniczy w Lublinie. Katedra Zastosowań Matematyki i Informatyki
Tematy:
correlation coefficient
interval estimation
coverage probability
confidence interval length
Źródło:
Colloquium Biometricum; 2008, 38
1896-7701
Pojawia się w:
Colloquium Biometricum
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
K voprosu planirovanija ehksperimenta na baze prikladnogo paketa
The question of planning experiment on the basis of application package excel
Autorzy:
Sinjaeva, O.
Zavgorodnijj, A.
Obykhvost, A.
Powiązania:
https://bibliotekanauki.pl/articles/77975.pdf
Data publikacji:
2013
Wydawca:
Komisja Motoryzacji i Energetyki Rolnictwa
Tematy:
mathematical model
autocorrelation
computer programme
correlation coefficient
planning experiment
Źródło:
Motrol. Motoryzacja i Energetyka Rolnictwa; 2013, 15, 7
1730-8658
Pojawia się w:
Motrol. Motoryzacja i Energetyka Rolnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Weighting in the template matching
Wagi dopasowywania szablonów
Autorzy:
Kalina, Jan
Powiązania:
https://bibliotekanauki.pl/articles/907031.pdf
Data publikacji:
2008
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
Image analysis
locating landmarks
correlation coefficient
robust nonparametric discrimination
Opis:
In the area of image analysis of templates, we have proposed and implemented a method for locating landmarks in 2D-images of faces. It uses the weighted correlation coefficient as a similarity measure between the template and the image. The weights are selected in the optimal way to improve the discrimination of parts of the image which correspond to the template from those which do not. The method does not use specific properties of faces.
Zaproponowaliśmy i zastosowaliśmy metodę lokalizacji punktów orientacyjnych obrazów dwuwymiarowych. Podstawą jej jest użycie ważonego współczynnika korelacji pomiędzy szablonem a obrazem. Wagi są wybierane w sposób optymalny dla poprawy rozróżnienia części obrazu, które odpowiadają szablonowi od tych które nie odpowiadają. Metoda nie odwołuje się do specyficznych własności twarzy.
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:
Podatkowy kontekst długu sektora general government
Autorzy:
Ziółkowska, Wiesława
Powiązania:
https://bibliotekanauki.pl/articles/630068.pdf
Data publikacji:
2015
Wydawca:
Szkoła Główna Handlowa w Warszawie
Tematy:
taxes, deficit, general government sector debt, Laffer curve, correlation,Pearson correlation coefficient
Opis:
The purpose of the paper is to present a retrospective analysis of taxation in thecontext of public debt in the years 1995–2013. The author attempts to verify thehypothesis according to which there is correlation of various degrees of significanceand various directions between taxes and the debt of the general government sectorof the EU Member States. The study of those correlations was preceded by ananalysis that indicated tendencies to diminish tax burdens which was a result of„copying” tax policy and simultaneously increase sources and change character ofthe causes of increasing public debt. Out of 25 states where the correlation betweentwo major groups of taxes in GDP and public debt was proved, in 15 states thedimension of the interdependence was positive, while in the remaining 10 – negative.In the first group the lower (higher) tax burdens were, the lower (higher) thepublic debt was. Therefore it might be inferred that the tax rate below or abovewhich the budget income moves was not exceeded. As far as the remaining 10countries are concerned (those with negative correlation), it might be suggestedthat the critical point of decreasing (increasing) taxes below (above) which theincome drops was exceeded. Both the descriptive analysis of the indices and statisticalexamination make it possible to verify the adopted hypothesis positively,indicating simultaneously the necessity for further examination.
Źródło:
Kwartalnik Kolegium Ekonomiczno-Społecznego Studia i Prace; 2015, 3, 4; 27-41
2082-0976
Pojawia się w:
Kwartalnik Kolegium Ekonomiczno-Społecznego Studia i Prace
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ wydajności pracy na zatrudnienie w polskim przemyśle przetwórczym
Labor Productivity and Its Impact on Employment in Poland’s Manufacturing Sector
Autorzy:
Bartosik, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/574491.pdf
Data publikacji:
2010-08-31
Wydawca:
Szkoła Główna Handlowa w Warszawie. Kolegium Analiz Ekonomicznych
Tematy:
labor productivity
employment
industry
Pearson correlation coefficient
total factor productivity
Opis:
The paper analyzes the influence of labor productivity on employment in various branches of Poland’s manufacturing sector in 1993-2007. The author attempts to determine if changes in labor productivity and employment were substitutive or complementary in nature and whether the relationship between these processes was stable or liable to change. The analysis, using the Pearsoncorrelation coefficient (which measures the strength of the linear relationship between two variables), shows that the relationship between labor productivity and employment turned from substitutive to complementary and that an improvement in labor productivity had no distinct impact on employment in the short term, while in the long term it promoted an increase in employment. The relationship between labor productivity and employment varied because the ways in which labor productivity improved tended to change. In the 1990s institutional changes led to an improvement in labor productivity, including the introduction of market economy mechanisms, privatization and greater competition in the wake of opening the economy. At the time the simplest method was used: employment reductions. With time this option petered out and companies began to improve labor productivity (and competitiveness) by investing, modernizing their fixed assets, and introducing product rather than process innovations. This had a favorable influence on employment, the author says.
Źródło:
Gospodarka Narodowa. The Polish Journal of Economics; 2010, 241, 7-8; 1-19
2300-5238
Pojawia się w:
Gospodarka Narodowa. The Polish Journal of Economics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A novel fault diagnosis method for marine blower with vibration signals
Autorzy:
Yan, Guohua
Hu, Yihuai
Jiang, Jiawei
Powiązania:
https://bibliotekanauki.pl/articles/32899234.pdf
Data publikacji:
2022
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
fault diagnosis
marine blower
EEMD
correlation coefficient
AR spectrum
BPNN
Opis:
The vibration signals on marine blowers are non-linear and non-stationary. In addition, the equipment in marine engine room is numerous and affects each other, which makes it difficult to extract fault features of vibration signals in the time domain. This paper proposes a fault diagnosis method based on the combination of Ensemble Empirical Mode Decomposition (EEMD), an Autoregressive model (AR model) and the correlation coefficient method. Firstly, a series of Intrinsic Mode Function (IMF) components were obtained after the vibration signal was decomposed by EEMD. Secondly, effective IMF components were selected by the correlation coefficient method. AR models were established and the power spectrum was analysed. It was verified that blower failure can be accurately diagnosed. In addition, an intelligent diagnosis method was proposed based on the combination of EEMD energy and a Back Propagation Neural Network (BPNN), with a correlation coefficient method to get effective IMF components, and the energy components were calculated, normalised as a feature vector. Finally, the feature vector was sent to the BPNN for training and state recognition. The results indicated that the EEMD-BPNN intelligent fault diagnosis method is suitable for higly accurate fault diagnosis of marine blowers.
Źródło:
Polish Maritime Research; 2022, 2; 77-86
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Efficient Phantom Source Widening
Autorzy:
Zotter, F.
Frank, M.
Powiązania:
https://bibliotekanauki.pl/articles/177701.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
source widening
phantom source
decorrelation
IACC
inter-aural cross correlation coefficient
Opis:
We present a highly efficient filter structure to create power-complementary filter pairs for phantom source widening. It either introduces frequency-dependent phase or amplitude differences in a pair of loudspeaker signals. We evaluate how the perceptual effect is influenced by off-center listening positions in a standard ±30o loudspeaker setup. The evaluation of the phantom source widening effect is based on measurements of the inter-aural cross-correlation coefficient (IACC), which is justified by its pronounced correlation to the perceived phantom source width in prior listening test results.
Źródło:
Archives of Acoustics; 2013, 38, 1; 27-37
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of surface soil moisture from SMOS satellite and ground measurements
Autorzy:
Usowicz, B.
Marczewski, W.
Usowicz, J.B.
Lukowski, M.I.
Lipiec, J.
Powiązania:
https://bibliotekanauki.pl/articles/25959.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
comparison
soil surface
soil moisture
SMOS satellite
ground
measurement
correlation coefficient
Opis:
Soil moisture datasets at various scales are needed for sustainable land use and water management. The aim of this study was to compare soil moisture ocean salinity satellite and in situ soil moisture data for the Podlasie and Polesie regions in Eastern Poland. Both regions have similar climatic and topo- graphic conditions but are different in land use, vegetation, and soil cover. The test sites were located on agricultural fields on sandy soils and natural vegetation on marshy soils that prevail in the Podlasie and Polesie regions, respectively. The soil moisture ocean salinity soil moisture data were obtained from radiometric measurements (1.4 GHz) and the ground soil moisture from sensors at a depth of 5 cm during the years 2010-2011. In general, temporal patterns of soil moisture from both satellite and ground measurements followed the rainfall trend. The regression coeffi- cients, Bland-Altman analysis, concordance correlation coefficient, and total deviation index showed that the agreement between ground and soil moisture ocean salinity derived soil moisture data is better for the Podlasie than the Polesie region. The lower agre- ement in Polesie was attributed mostly to the presence of the widespread natural vegetation on the wetter marsh soil along with minor contribution of agriculturally used drier coarse-textured soils.
Źródło:
International Agrophysics; 2014, 28, 3
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Correlations among morphological traits of sweet chestnut (Castanea sativa Miller) from Bosnia and Herzegovina
Autorzy:
Tug, A.
Hodzic, M.M.
Ballian, D.
Powiązania:
https://bibliotekanauki.pl/articles/2106657.pdf
Data publikacji:
2022
Wydawca:
Instytut Badawczy Leśnictwa
Tematy:
correlation coefficient
morphological trait
sweet chestnut
Castanea sativa
Bosnia and Herzegovina
Opis:
Sweet chestnut forests in Bosnia and Herzegovina are underrepresented in the total forest fund, and their area is declining today. The research aims to determine the correlation relations of morphological traits of chestnut leaves, fruit and cupule in the population of Bosnian Krajina (northwestern Bosnia and Herzegovina) to undertake selection and breeding activities. Eleven traits of fruits, leaves and cupules were measured, seven assessed and six calculated. A mutual correlation for the researched traits was calculated using the Pearson correlation coefficient r. When the fruit traits and cupule traits were compared, the needle length showed a statistically significant correlation with most of the fruit traits. The traits of the number of fruits in the cupule and needle length had a statistically significant correlation coefficient with leaf blade width and leaf petiole length. The correlated traits can be distinguished as important for further selection and breeding of sweet chestnuts. The research results indicate that the genetic material of sweet chestnut is a rich source of genetic diversity and can be used in selection to obtain new varieties and cultivars in Bosnia and Herzegovina and for the protection of the indigenous gene pool.
Źródło:
Folia Forestalia Polonica. Series A . Forestry; 2022, 64, 1; 49-57
0071-6677
Pojawia się w:
Folia Forestalia Polonica. Series A . Forestry
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Elimination of characteristics concerning the performance of open-ended equity funds using PCA
Autorzy:
Żebrowska-Suchodolska, Dorota
Powiązania:
https://bibliotekanauki.pl/articles/19931878.pdf
Data publikacji:
2023-09-08
Wydawca:
Główny Urząd Statystyczny
Tematy:
PCA
investment funds
decision-making
tau-Kendall correlation coefficient
investment efficiency
Opis:
From an investor's point of view, the appropriate selection of a fund is an important issue. When making such a choice, many elements should be considered. These include not only the fund's rate of return or its risk, but also the comparison of the fund's results with an appropriate benchmark. The aim of the research was to apply principal component analysis (PCA) to reduce the dimension of the indicators that help the investor in selecting a fund. The subject of the study was 15 equity funds that had been on the Polish market for many years. The research showed that it is possible to reduce the primary variables to two dimensions.
Źródło:
Statistics in Transition new series; 2023, 24, 4; 153-168
1234-7655
Pojawia się w:
Statistics in Transition new series
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
CZYNNIKI RÓŻNICUJĄCE SPOŻYCIE WYROBÓW SPIRYTUSOWYCH W POLSKICH GOSPODARSTWACH DOMOWYCH W LATACH 1999 - 2008
FACTORS INFLUENCING ALCOHOL CONSUMPTION IN POLISH HOUSEHOLDS IN 1999-2008
Autorzy:
Zmarzłowski, Krzysztof
Koszela, Grzegorz
Powiązania:
https://bibliotekanauki.pl/articles/453762.pdf
Data publikacji:
2013
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Katedra Ekonometrii i Statystyki
Tematy:
konsumpcja wyrobów spirytusowych
gradacyjna analiza danych
polskie gospodarstwa domowe
współczynnik Pearsona
współczynnik Spearmana
Alcohol consumption
Grade data analysis
Polish households
Pearson correlation coefficient
Spearman rank correlation coefficient
Opis:
Celem niniejszej pracy było wyodrębnienie czynników różnicujących spożycie wyrobów spirytusowych w polskich gospodarstwach domowych w latach 1999-2008. W pracy użyto metod gradacyjnej analizy danych oraz klasycznych metod badania siły zależności zjawisk.
The main objective of this research was to determine factors that influenced consumption of alcoholic beverage in Polish households in 1999-2008. During the course of study authors applied classic methods of correlation and modern methods of grade data analysis.
Źródło:
Metody Ilościowe w Badaniach Ekonomicznych; 2013, 14, 3; 101-112
2082-792X
Pojawia się w:
Metody Ilościowe w Badaniach Ekonomicznych
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of laser priming on canola yield and its components under salt stress
Autorzy:
Mohammadi, S.K.
Shekari, F.
Fotovat, R.
Darudi, A.
Powiązania:
https://bibliotekanauki.pl/articles/26380.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
laser irradiation
canola
yield
yield component
salt stress
salinity
seed
correlation coefficient
Opis:
The effect of laser priming at different irradiation times on canola yield and its components under saline conditions were investigated. The results showed that laser priming had a positive effect on yield and its components and caused yield increase under saline conditions. Increase in salt levels had a negative and significant effect on seed yield, number of seeds per pod, number of pod per plant, pod length and plant height. The results showed that 45-min laser priming had the strongest effect on yield and yield components and reduced significantly the adverse effects of salinity.By contrast, laser radiation applied for 60 and 75 min, resulted in a dramatic decrease in yield and its components. Correlation coefficients between the attributes showed that canola yield had a positive and significant correlation with plant height, number of seeds, pod per main branch and lateral branches, length of pod and number of lateral branches. Effects of laser and salinity were significant on lateral branch pod length but not on main branch pods.
Źródło:
International Agrophysics; 2012, 26, 1
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamic stability and spatial heterogeneity in the individual-based modelling of a Lotka-Volterra gas
Autorzy:
Waniewski, J.
Jędruch, W.
Żołek, N. S.
Powiązania:
https://bibliotekanauki.pl/articles/907374.pdf
Data publikacji:
2004
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
równanie Lotka-Volterra
entropia
współczynnik korelacji
predator-prey system
entropy
correlation coefficient
Opis:
Computer simulation of a few thousands of particles moving (approximately) according to the energy and momentum conservation laws on a tessellation of 800 x 800 squares in discrete time steps and interacting according to the predator-prey scheme is analyzed. The population dynamics are described by the basic Lotka-Volterra interactions (multiplication of preys, predation and multiplication of predators, death of predators), but the spatial effects result in differences between the system evolution and the mathematical description by the Lotka-Volterra equations. The spatial patterns were evaluated using entropy and a cross correlation coefficient for the spatial distribution of both populations. In some simulations the system oscillated with variable amplitude but rather stable period, but the particle distribution departed from the (quasi) homogeneous state and did not return to it. The distribution entropy oscillated in the same rhythm as the population, but its value was smaller than in the initial homogeneous state. The cross correlation coefficient oscillated between positive and negative values. Its average value depended on the space scale applied for its evaluation with the negative values on the small scale (separation of preys from predators) and the positive values on the large scale (aggregation of both populations). The stability of such oscillation patterns was based on a balance of the population parameters and particle mobility. The increased mobility (particle mixing) resulted in unstable oscillations with high amplitude, sustained homogeneity of the particle distribution, and final extinction of one or both populations.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2004, 14, 2; 139-147
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of the influence of infrastructural and economic factors on the volume of freight transport on railway lines in Poland
Autorzy:
Kamiński, Wojciech
Powiązania:
https://bibliotekanauki.pl/articles/1841155.pdf
Data publikacji:
2020
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
freight transport
correlation coefficient
railway transport
transport kolejowy
transport towarowy
współczynnik korelacji
Opis:
This article assesses the effect of factors, such as the number of sidings, the number of station holds, and the occurrence of transit traffic on the volume of freight transport on railway lines in Poland. The volume of freight transport on a railway lin as expressed by the operational work done by freight trains running on this line and the transported freight mass by them. Most often the effect of factors affecting on the volume of transport is assessed by a team of experts. In this analysis, calculations of partial correlation coefficients were performed. The calculations showed that there is a clear relationship between the volume of freight transport and the number of sidings on the line and the occurrence of transit traffic. Based on the obtained partial correlation coefficients, weights corresponding to the effects of individual factors on the volume of freight transport were calculated. The use of these weights for further analysis will avoid the subjective expert assessments that have been used in this type of analysis so far.
Źródło:
Transport Problems; 2020, 15, 4, cz. 2; 167-178
1896-0596
2300-861X
Pojawia się w:
Transport Problems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Prospects of electrosleep therapy devices for long-distance drivers
Autorzy:
Kernytskyy, Ivan
Storchun, Yevhen
Yakovenko, Yevheniia
Horbay, Orest
Humenuyk, Ruslan
Sholudko, Yaroslav
Powiązania:
https://bibliotekanauki.pl/articles/1064797.pdf
Data publikacji:
2020
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
encephalogram
biorhythm
correlation coefficient
impulse signal
electrosleep therapy devices
long-distance driver
Opis:
Accomulated exhaustion is a fairly common problem for long-distance truck and bus drivers on international routes. In case of uncompensated exhaustion, the driver is unable to overcome the resulting attention violations with will effort, which increases the probability of errors and accidents. The last claim is confirmed by the increase in the number of incidents after 7 h and especially 10 h of work. To overcome this problem, it is necessary to stop and fall asleep for a short time. Recovery comes in about 10–15 min of relaxation. The source of stimulation of the brain is weak impulse current, which causes sleep of varying depth and duration. Clinical studies have shown that the strongest impact is on pulses with a duration of approximately 0.3– –0.5 ms and a frequency of repetition ranging from 0.5–2 to 80–100 Hz. Current levels are typically between 50 and 5 mA. Transcranial electrotherapy is considered to stimulate endorphin production and affect the hypothalamus, causing changes in neurohormonal regulatory mechanisms and reticular formation of the brain stem. The reticular formation is involved in many behavioral reactions and has a significant impact on body functioning and thought processes. The aim of this work was to determine correlation between human brain biorhythms and electrosleep device signal by calculating mutual correlation. For this purpose, the model in MATLAB Simulink environment was developed. The encephalogram was processed using the EEGLAB tool to remove artifacts. A model in the MATLAB Simulink environment was developed to evaluate the effect of the signal characteristics of electrosleep therapy devices on brain biorhythms, with the help of which correlation coefficients were calculated.
Źródło:
Scientific Review Engineering and Environmental Sciences; 2020, 29, 4; 454-460
1732-9353
Pojawia się w:
Scientific Review Engineering and Environmental Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Acidity and electrical conductivity of selected muscles in lamb carcass
Kwasowość i przewodność elektryczna wybranych mięśni tuszy jagnięcej
Autorzy:
Stanisz, M.
Pietrzak, M.
Ślósarz, P.
Steppa, R.
Powiązania:
https://bibliotekanauki.pl/articles/2197638.pdf
Data publikacji:
2007
Wydawca:
Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
Tematy:
lamb
muscle
lamb meat
acidity
electrical conductivity
slaughter
carcass
correlation coefficient
pH
Źródło:
Annales Universitatis Mariae Curie-Skłodowska. Sectio EE: Zootechnica; 2007, 25, 1; 1-6
0239-4243
2083-7399
Pojawia się w:
Annales Universitatis Mariae Curie-Skłodowska. Sectio EE: Zootechnica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Correlation between the main diagnostic features of rail vehicles’ wheel profiles in the operational period
Autorzy:
Brzeźny, Andrzej
Potępa, Piotr
Sowa, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/215283.pdf
Data publikacji:
2019
Wydawca:
Instytut Kolejnictwa
Tematy:
operational tests
rail vehicles
diagnostic features
wheel profile
Pearson’s correlation coefficient
Opis:
The paper is dedicated to correlations between the main diagnostic features utilised for assessing the wear of wheel tyre running treads and the wear of wheel flanges. The paper focuses on analysis of the correlations between these features in the period between the mounting of new wheel tyres or new monoblock wheels in a given wheelset up to their replacement. The wheels of Electric Multiple Units and shunting locomotives were the objects of the research. The measurement data obtained from a domestic railway undertaking contain, however, many errors. It was noted that in some cases the measured values were put in the wrong places on the measurement cards. It is also possible that in some cases the wheel surfaces were not prepared properly for measurements. For those reasons, only some data, for which there were no doubts regarding credibility, were chosen. Those data were appropriate for determining the trend line equations, which depict an overview of how the values of the diagnostic features are correlated with each other. The obtained functions of the characteristics of the changes in the diagnostic features as well as calculated Pearson correlation coefficients show that there is a significant correlation between those features. This is not dependent on the significantly different operational conditions of the groups of tested rail vehicles. Conclusions on the existence of significant correlations between the tested features can be used for the creation of innovative solutions dedicated for wheel diagnostics of rail vehicles. This especially applies to the design of analytical functions, which could be used for real time verification of the correctness of the measurement results.
Źródło:
Problemy Kolejnictwa; 2019, 183; 99-105
0552-2145
2544-9451
Pojawia się w:
Problemy Kolejnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Studies on some physico-chemical parameters of cyanophycean members and correlation coefficient of eutrophic ponds in Chidambaram, Tamil Nadu, India
Autorzy:
Elayaraj, B.
Selvaraju, M.
Powiązania:
https://bibliotekanauki.pl/articles/10938.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
physicochemical parameter
phytoplankton
correlation coefficient
eutrophic pond
pond
Chidambaram town
Tamil Nadu
India
Opis:
The present study deals with the statistical analysis of physico-chemical parameters and cyanophycean members of two pond water quality of Chidambaram, Cuddalore district (Tamil Nadu). The qualities of pond water were analyzed for six months. Eleven important parameters were included in statistical analysis. The qualities of pond water have been assessed by calculating mean, standard deviation and correlation coefficient. Correlation studies of hydrobiology with physico-chemical parameters revealed that the relationship between phytoplankton density in general and that of the specific groups are highly complex and often controlled by interactions of different factors. In the both pond water the correlation coefficient test revealed that cyanophycean members positively correlated with temperature, pH, CO2, alkalinity, hardness, nitrate, BOD and COD at 1 % and 5 % level significant, where as it is negatively correlated with acidity and dissolved oxygen. In the present study it can be concluded that the cyanophycean members are highly tolerant organisms. They prefer to grow at higher temperatures and in highly alkaline, BOD and COD waters. Hence they can with stand high levels of contaminated waters of Thillai Kali Kovil pond, when compared to Ilamiyakkinar Kovil pond.
Źródło:
International Letters of Natural Sciences; 2014, 11, 2
2300-9675
Pojawia się w:
International Letters of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ground reaction force analysed with correlation coefficient matrix in group of stroke patients
Autorzy:
Szczerbik, E.
Krawczyk, M.
Syczewska, M.
Powiązania:
https://bibliotekanauki.pl/articles/307491.pdf
Data publikacji:
2014
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
ground reaction force
correlation coefficient
stroke
siła reakcji podłoża
współczynnik korelacji
udar mózgu
Opis:
Stroke is the third cause of death in contemporary society and causes many disorders. Clinical scales, ground reaction force (GRF) and objective gait analysis are used for assessment of patient’s rehabilitation progress during treatment. The goal of this paper is to assess whether signal correlation coefficient matrix applied to GRF can be used for evaluation of post-stroke patients status. Group of patients underwent clinical assessment and instrumented gait analysis simultaneously three times. The difference between components of patient’s GRF (vertical, fore/aft, med/lat) and normal ones (reference GRF of healthy subjects) was calculated as correlation coefficient. Patients were divided into two groups (“worse and better”) based on the clinical functional scales tests done at the beginning of rehabilitation process. The results obtained by these two groups were compared using statistical analysis. Increase of median value of correlation coefficient is observed in all components of GRF, but only in non-paretic leg. Analysis of GRF signal can be helpful in assessment of post-stroke patients during rehabilitation. Improvement in stroke patients was observed in non-paretic leg of the “worse” group. GRF analysis should not be the only tool for objective validation of patient’s improvement, but could be used as additional source of information.
Źródło:
Acta of Bioengineering and Biomechanics; 2014, 16, 2; 3-9
1509-409X
2450-6303
Pojawia się w:
Acta of Bioengineering and Biomechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza korelacji w stosunkach międzynarodowych na przykładzie wybranych aspektów stosunków polsko-niemieckich
Correlation analysis in international relations on the example of selected aspects of German-Polish relations
Autorzy:
Chaim, Arkadiusz
Łukasik, Norbert
Powiązania:
https://bibliotekanauki.pl/articles/51821914.pdf
Data publikacji:
2024-09-30
Wydawca:
Wydawnictwo Adam Marszałek
Tematy:
correlation analysis
variables
Spearman’s rank correlation coefficient
chi-squared test of independence
relationships and influences
spurious correlation
Opis:
Correlation analysis is one of the tools that can be used when examining the relationship between quantitative and qualitative variables in international relations. To carry it out, it is important to meet the necessary assumptions regarding a given correlation coefficient. Several of the most used coefficients are presented, broken down into quantitative, ordinal, and nominal variables. The aim of the study was to present the use of correlation analysis on the example of selected economic and non-economic aspects of Polish-German relations. Trade and the structures of the two countries’ European trade partners were shown to be strongly correlated using Spearman’s rank correlation coefficient. In turn, using the chi-square test of independence, it was also found that there is no statistically significant relationship between Germans residing in one of the former German states and maintaining contacts with Poland. A model for subjective analysis of relationships and influences was also proposed. Consequently, it is suggested that statistical methods should be used more frequently in the study of international relations as a complement to classical descriptive methods.
Źródło:
Krakowskie Studia Małopolskie; 2024, 3(43); 83-110
1643-6911
Pojawia się w:
Krakowskie Studia Małopolskie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of the chemical composition of spring durum wheat grain (triticum durum)and common wheat grain(triticum aestivum ssp. Vulgare)
Porównanie składu chemicznego ziarna pszenicy jarej twardej (Triticum durum) z pszenicą zwyczajną (Triticum aestivum ssp. vulgare)
Autorzy:
Rachon, L.
Palys, E.
Szumilo, G.
Powiązania:
https://bibliotekanauki.pl/articles/1188056.pdf
Data publikacji:
2012
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
Tematy:
durum wheat
common wheat
pasta
grain quality
chemical composition
macroelements
microelements
coefficient of variation
correlation coefficient.
Opis:
Badania przeprowadzono w latach 2007-2009 na terenie Gospodarstwa Doświadczalnego w Felinie, należącego do Uniwersytetu Przyrodniczego w Lublinie. Doświadczenie zlokalizowano na glebie zaliczanej do kompleksu pszennego dobrego. Badaniami objęto formę jarą pszenicy twardej (Triticum durum Desf.): linia hodowlana LGR 896/23 (wyselekcjonowana w UP w Lublinie) i odmiany Lloyd (amerykańska), Chado i Kharkivska 27 (ukraińskie), którą porównano z pszenicą jarą zwyczajną (Triticum aestivum ssp. vulgare) odmiany Torka. w pracy analizowano skład chemiczny ziarna pszenicy twardej i pszenicy zwyczajnej. Określono zawartość białka ogólnego, włókna, tłuszczu, popiołu, bezazotowych substancji wyciągowych, makroelementów (fosforu, potasu, wapnia, magnezu) i mikroelementów (miedzi, żelaza, manganu, cynku). obliczono także współczynniki zmienności oraz współczynniki korelacji. wszystkie badane linie i odmiany pszenicy jarej twardej zawierały więcej białka ogólnego oraz cynku w porównaniu z pszenicą zwyczajną. Pszenica zwyczajna miała wyższą zawartośc miedzi i manganu w ziarnie w porównaniu z pszenicą twardą. Spośród cech jakościowych ziarna badanych pszenic, niezależnie od gatunku, zawartość substancji bezazotowych wyciągowych okazała się cechą najmniej zmienną (cv=1,5%), największą zaś zmienność (cv=37,2%) stwierdzono w przypadku zawartości manganu. W ziarnie pszenicy wykazano istotne korelacje dla następujących par cech jakościowych: białko-substancje bezazotowe wyciągowe, białko-popiół, oraz popiół-substancje bezazotowe wyciagowe. wykazano, że zarówno linia i odmiany pszenicy twardej, jak też odmiana pszenicy zwyczajnej spełniają normy surowca do produkcji makaronu pod względem zawartości białka. Podwyższona popiołowośc mąki może stwarzać niebezpieczeństwo uzyskania makaronu o ciemniejszej barwie.
Źródło:
Journal of Elementology; 2012, 17, 1; 105-114
1644-2296
Pojawia się w:
Journal of Elementology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Genetic and environmental correlation and path coefficient analysis of fruit yield per bush and other traits in black currants [Ribes nigrum L.]
Autorzy:
Madry, W
Pluta, S.
Zurawicz, E.
Powiązania:
https://bibliotekanauki.pl/articles/2042171.pdf
Data publikacji:
2000
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
F1 hybrid
fruit yield
correlation coefficient
bush
Ribes nigrum
diallel cross
black currant
Źródło:
Journal of Applied Genetics; 2000, 41, 4; 221-236
1234-1983
Pojawia się w:
Journal of Applied Genetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Adsorpcja chromu z wód o różnym składzie chemicznym
Chromium adsorption from waters of different chemical composition
Autorzy:
Lach, J.
Powiązania:
https://bibliotekanauki.pl/articles/297144.pdf
Data publikacji:
2016
Wydawca:
Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Tematy:
chromium
adsorption
activated carbon
Pearson correlation coefficient
chrom
adsorpcja
węgiel aktywny
współczynnik korelacji Pearsona
Opis:
The effectiveness of the Cr(VI) anions or Cr(III) cations adsorption depends, among others, on the chemical composition of the solution. The study analyzed the impact of the composition of 8 natural waters (spring, low-, medium-, and highly mineralised) on the effectiveness of the adsorption of Cr(VI) and Cr(III) on WG-12 carbon. The adsorption capacity of carbon against the hexavalent chromium from a single-component solution of 1 mg/dm3 concentration (the carbon mass to the weight of the solution 1:250) was 240 mg/kg, while from the medium-carbonized water - 195 mg/kg. In the case of trivalent chromium, under similar conditions, the effect of the presence of competing ions was much more pronounced (the capacity for a monovalent solution was 140 mg/kg, and for medium-carbonized water only 30 mg/kg). There was a negative correlation observed between the adsorption efficiency of Cr(III) and Cr(VI) (average, or at maximum concentration), and the amount of anions, cations and general mineralization. Analysing the adsorption of solutions of different composition and degree of mineralization, but of similar solution pH values, very high correlations are observed (by the Pearson correlation coefficient).
Skuteczność adsorpcji anionów Cr(VI) lub kationów Cr(III) zależy m.in. od składu chemicznego roztworu. W pracy przeanalizowano wpływ składu 8 naturalnych wód (źródlanych, nisko-, średnio- i wysokozmineralizowanych) na skuteczność adsorpcji Cr(VI) i Cr(III) na węglu WG-12. Pojemność adsorpcyjna węgla wobec chromu sześciowartościowego z roztworu jednoskładnikowego o stężeniu 1 mg/dm3 (masa węgla do masy roztworu 1:250) wynosiła 240 mg/kg, podczas gdy z wody średniozmineralizowanej 195 mg/kg. W przypadku chromu trójwartościowego w analogicznych warunkach wpływ obecności konkurencyjnych jonów był znacznie bardziej widoczny (pojemność dla roztworu jednowartościowego wynosiła 140 mg/kg, a dla wody średniozmineralizowanej tylko 30 mg/kg). Między skutecznością adsorpcji Cr(III) i Cr(VI) (średnią lub przy maksymalnym stężeniu) a ilością anionów, kationów i mineralizacją ogólną zachodzi ujemna korelacja. Jeśli analizuje się adsorpcję z roztworów o różnym składzie (stopniu mineralizacji), ale o podobnych wartościach pH roztworu, otrzymuje się bardzo wysokie zależności (wg współczynnika korelacji Pearsona).
Źródło:
Inżynieria i Ochrona Środowiska; 2016, 19, 3; 353-362
1505-3695
2391-7253
Pojawia się w:
Inżynieria i Ochrona Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reformy bankowe a wzrost gospodarczy. Przykład krajów transformujących się
Banking reform and economic growth. Example countries in transition
Autorzy:
Baszyński, Adam
Powiązania:
https://bibliotekanauki.pl/articles/509736.pdf
Data publikacji:
2016-03-30
Wydawca:
Polskie Towarzystwo Ekonomiczne
Tematy:
dobrobyt społeczny
metodologia nauk ekonomicznych
teoria ekonomii
banking reforms
transition
economic growth
correlation coefficient
Opis:
Celem artykułu jest szukanie współzależności między postępem reform bankowych a wzrostem gospodarczym w krajach transformujących się w latach 1989-2010. Badanie przeprowadzone na postawie panelu danych dowodzi umiarkowanej ujemnej współzależności pomiędzy postępem reform bankowych a tempem wzrostu gospodarczego. Natomiast korelacja wskaźnika określającego stan zaawansowania reform bankowych z poziomem PKB per capita jest umiarkowanie dodatnia. Z punktu widzenia polityki oznacza to brak wspierania procesu wzrostu gospodarczego przez reformy bankowe dokonujące się w krajach transformujących się. Jednak stan zaawansowania reform bankowych jest tym większy im wyższy poziom PKB per capita.
This article aims to look for correlation between progress in banking reforms and economic growth in transition countries in the period 1989-2010. Study carried out on the basis of panel data shows a moderate negative correlation between the development of banking reforms and economic growth. In contrast, the correlation indicator describing the progress of banking reforms with GDP per capita is moderately positive. From a policy perspective, this means the lack of supporting the process of economic growth by the banking reforms taking place in the transition countries. However, the progress of banking reforms is the greater the higher the level of GDP per capita.
Źródło:
Zeszyty Naukowe Polskiego Towarzystwa Ekonomicznego w Zielonej Górze; 2016, 3, 4; 4-16
2391-7830
2545-3661
Pojawia się w:
Zeszyty Naukowe Polskiego Towarzystwa Ekonomicznego w Zielonej Górze
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-25 z 86

Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies