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Wyświetlanie 1-15 z 175
Tytuł:
An Extension of the Classical Distance Correlation Coefficient for Multivariate Functional Data with Applications
Autorzy:
Górecki, Tomasz
Krzyśko, Mirosław
Ratajczak, Waldemar
Wołyński, Waldemar
Powiązania:
https://bibliotekanauki.pl/articles/465741.pdf
Data publikacji:
2016
Wydawca:
Główny Urząd Statystyczny
Tematy:
multivariate functional data
functional data analysis
correlation analysis
Opis:
The relationship between two sets of real variables defined for the same individuals can be evaluated by a few different correlation coefficients. For the functional data we have one important tool: canonical correlations. It is not immediately straightforward to extend other similar measures to the context of functional data analysis. In this work we show how to use the distance correlation coefficient for a multivariate functional case. The approaches discussed are illustrated with an application to some socio-economic data.
Źródło:
Statistics in Transition new series; 2016, 17, 3; 449-466
1234-7655
Pojawia się w:
Statistics in Transition new series
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of cascading two-dimensional canonical correlation analysis to image matching
Autorzy:
Forczmański, P.
Kukharev, G.
Kamenskaya, E.
Powiązania:
https://bibliotekanauki.pl/articles/206165.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
canonical correlation analysis
image matching
face recognition
Opis:
The paper presents a novel approach to Canonical Correlation Analysis (CCA) applied to visible and thermal infrared spectrum facial images. In the typical CCA framework biometrical information is transformed from original feature space into the space of canonical variates, and further processing takes place in this space. Extracted features are maximally correlated in canonical variates space, making it possible to expose, investigate and model latent relationships between measured variables. In the paper the CCA is implemented along two directions (along rows and columns of pixel matrix of dimension M x N) using a cascade scheme. The first stage of transformation proceeds along rows of data matrices. Its results are reorganized by transposition. These reorganized matrices are inputs to the second processing stage, namely basic CCA procedure performed along the rows of reorganized matrices, resulting in fact in proceeding along the columns of input data matrix. The so called cascading 2DCCA method also solves the Small Sample Size problem, because instead of the images of size MxN pixels in fact we are using N images of size M x 1 pixels and M images of size 1 x N pixels. In the paper several numerical experiments performed on FERET and Equinox databases are presented.
Źródło:
Control and Cybernetics; 2011, 40, 3; 833-848
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of correlation based dimension reduction methods
Autorzy:
Shin, Y. J.
Park, C. H.
Powiązania:
https://bibliotekanauki.pl/articles/907508.pdf
Data publikacji:
2011
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
analiza korelacyjna
redukcja wymiaru
liniowa analiza dyskryminacji
canonical correlation analysis
dimension reduction
discriminative canonical correlation analysis
linear discriminant analysis
Opis:
Dimension reduction is an important topic in data mining and machine learning. Especially dimension reduction combined with feature fusion is an effective preprocessing step when the data are described by multiple feature sets. Canonical Correlation Analysis (CCA) and Discriminative Canonical Correlation Analysis (DCCA) are feature fusion methods based on correlation. However, they are different in that DCCA is a supervised method utilizing class label information, while CCA is an unsupervised method. It has been shown that the classification performance of DCCA is superior to that of CCA due to the discriminative power using class label information. On the other hand, Linear Discriminant Analysis (LDA) is a supervised dimension reduction method and it is known as a special case of CCA. In this paper, we analyze the relationship between DCCA and LDA, showing that the projective directions by DCCA are equal to the ones obtained from LDA with respect to an orthogonal transformation. Using the relation with LDA, we propose a new method that can enhance the performance of DCCA. The experimental results show that the proposed method exhibits better classification performance than the original DCCA.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2011, 21, 3; 549-558
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spatial variation of air temperature in the Arctic in 1951-1990
Autorzy:
Przybylak, Rajmund
Powiązania:
https://bibliotekanauki.pl/articles/2052494.pdf
Data publikacji:
1997
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Arctic
air temperature changes
spatial relations
correlation analysis
Źródło:
Polish Polar Research; 1997, 18, 1; 41-63
0138-0338
2081-8262
Pojawia się w:
Polish Polar Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of substituent effects on β-naphthyl based isoxazoles by IR and NMR spectra
Autorzy:
Thirunarayanan, G.
Sathiyendiran, V.
Arulkumarn, R.
Sundararrajan, R.
Manikandan, R.
Vanangamud, G.
Powiązania:
https://bibliotekanauki.pl/articles/1194022.pdf
Data publikacji:
2015
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Correlation analysis
IR spectra
NMR spectra
β-naphthyl dihydroisoxazoles
Opis:
A series containing thirteen 3-(2-naphthyl)-5-(substituted phenyl)-4,5-dihydroisoxazole have been synthesized and examined their purities by their data reported earlier. The characteristic infrared νC=N (cm-1) stretches, NMR chemical shifts (δ, ppm) of H4,4׳, H5 protons, C3-5 carbons were assigned and correlated with Hammett substituent constants and Swain-Lupton’s parameters using single and multi- regression analysis. From the results of regression analysis the effect of substituents on the spectral data have been studied.
Źródło:
World Scientific News; 2015, 9; 35-58
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Relationship between yield components and seed yield obtained from oil crops of the family Brassicaceae
Związek pomiędzy komponentami plonu a plonem nasion roślin oleistych z rodziny Brassicaceae
Autorzy:
Jankowski, K.J.
Budzynski, W.S.
Hulanicki, P.
Powiązania:
https://bibliotekanauki.pl/articles/1201121.pdf
Data publikacji:
2015
Wydawca:
Instytut Hodowli i Aklimatyzacji Roślin
Tematy:
oil crop
yield component
seed yield
Brassicaceae
correlation analysis
Źródło:
Rośliny Oleiste - Oilseed Crops; 2015, 36
1233-8273
Pojawia się w:
Rośliny Oleiste - Oilseed Crops
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis, spectral correlation analysis and evaluation of biological activities of some substituted hydrazones
Autorzy:
Vijayakumar, Renganathan
Senbagam, Rajamohan
Rajarajan, Murugan
Balaji, Selvaraj
Manikandan, Venkatesan
Vanangamudi, Ganesan
Thirunarayanan, Ganesamoorthy
Powiązania:
https://bibliotekanauki.pl/articles/764124.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
Tematy:
Hydrazones
UV
IR & NMR spectra
Correlation analysis
Antimicrobial activities
Opis:
Some novel substituted hydrazone derivatives of amino guanidine have been synthesized with different substituted benzaldehydes by condensation method. The synthesized hydrazones were characterized by their physical constants, UV, IR and NMR spectra. The spectral data have been correlated with Hammett substituent constants and Swain–Lupton parameters. From the result of statistical analysis, the effects of substituents on the spectral data have been predicted. The antimicrobial activities of these synthesized hydrazone compounds have been screened by Bauer-Kirby method using human pathogenic bacteria and fungal species. The antimicrobial activities of all synthesized hydrazone compounds have shown significant activity.
Źródło:
Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia; 2015, 70, 2
2083-358X
Pojawia się w:
Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Methods of Representation for Kernel Canonical Correlation Analysis
Autorzy:
Krzyśko, Mirosław
Waszak, Łukasz
Powiązania:
https://bibliotekanauki.pl/articles/465909.pdf
Data publikacji:
2012
Wydawca:
Główny Urząd Statystyczny
Tematy:
Canonical correlation analysis generalized eigenvalue problem reproducing kernel Hilbert space
Opis:
Classical canonical correlation analysis seeks the associations between two data sets, i.e. it searches for linear combinations of the original variables having maximal correlation. Our task is to maximize this correlation. This problem is equivalent to solving the generalized eigenvalue problem. The maximal correlation coefficient (being a solution of this problem) is the first canonical correlation coefficient. In this paper we construct nonlinear canonical correlation analysis in reproducing kernel Hilbert spaces. The new kernel generalized eigenvalue problem always has the solution equal to one, and this is a typical case of over-fitting. We present methods to solve this problem and compare the results obtained by classical and kernel canonical correlation analysis.
Źródło:
Statistics in Transition new series; 2012, 13, 2; 301-310
1234-7655
Pojawia się w:
Statistics in Transition new series
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Opredelenie korreljacionnojj svjazi mezhdu otdel'nymi geometricheskimi parametrami zeren razlichnykh kul'tur
Determination of correlation relationship between individual geometrical parameters of grains of different cultures
Autorzy:
Kuzminskijj, R.
Sokolovskijj, O.
Sheremeta, R.
Powiązania:
https://bibliotekanauki.pl/articles/77786.pdf
Data publikacji:
2015
Wydawca:
Komisja Motoryzacji i Energetyki Rolnictwa
Tematy:
grain crop
wheat
rye
geometrical parameter
random variable
correlation analysis
Źródło:
Motrol. Motoryzacja i Energetyka Rolnictwa; 2015, 17, 4
1730-8658
Pojawia się w:
Motrol. Motoryzacja i Energetyka Rolnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Using Permutation Tests in Multiple Correlation Investigation
Wykorzystanie testu permutacyjnego w badaniach korelacji wielowymiarowej
Autorzy:
Stelmach, Jacek
Powiązania:
https://bibliotekanauki.pl/articles/906864.pdf
Data publikacji:
2012
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
permutation tests
Data Mining
correlation analysis
batch process
Monte Carlo
Opis:
An indication of correlation between dependent variable and predictors is a crucial point in building statistical regression model. The test of Pearson correlation coefficient – with relatively good power – needs to fulfill the assumption about normal distribution. In other cases only non-parametric tests can be used. This article presents a possibility and advantages of permutation tests with the discussion about proposed test statistics. The power of proposed tests was estimated on the basis of Monte Carlo experiments. The investigations were carried out for real data – a sample of refinery process parameters, where the indication of changes in correlation, even for sample with small size is very important. It creates an opportunity to react to changes and update statistical models quickly and keep acceptable quality of prediction
Źródło:
Acta Universitatis Lodziensis. Folia Oeconomica; 2012, 269
0208-6018
2353-7663
Pojawia się w:
Acta Universitatis Lodziensis. Folia Oeconomica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza korelacji pomiędzy wybranymi wskaźnikami finansowymi na przykładzie spółek publicznych
The Correlation Analysis Between the Chosen Financial Ratios on Example of Public Companies
Autorzy:
Węgrzyn, Tomasz
Powiązania:
https://bibliotekanauki.pl/articles/592497.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Ekonomiczny w Katowicach
Tematy:
Analiza korelacji
Spółki
Wskaźniki finansowe
Companies
Correlation analysis
Financial indicators
Opis:
W artykule zbadano korelację pomiędzy wybranymi wskaźnikami finansowymi. Przeanalizowano 46 wskaźników wyznaczonych dla 219 firm notowanych na GPW w Warszawie oraz na rynku New Connect. Każdy ze wskaźników wyznaczono na podstawie raportów finansowych za lata 2008 i 2009. Na podstawie uzyskanych wyników można stwierdzić, że większość z badanych wskaźników wykazuje pewien stopień skorelowania. Jedynie 8 spośród badanych wskaźników nie jest skorelowana z pozostałymi. Ponadto analizowana jest zgodność uporządkowania przedsiębiorstw, gdy do budowy rankingu wykorzystuje się wskaźniki o różnym poziomie skorelowania
The author studies the correlation between the chosen financial ratios. The 46 ratios are calculated for 219 companies listed on the Warsaw Stock Exchange or on the alternative trading system New Connect. Each ratio is computed on the base of the annual financial statement for the year 2008 and 2009. As a result, it can be stated that many of the chosen financial ratios are correlated. There are 8 of them, which are not correlated with others. Moreover the ordering compliance of companies in the rankings is analysed, when rankings are created on the base of financial ratios with different level of correlation.
Źródło:
Studia Ekonomiczne; 2014, 207; 255-268
2083-8611
Pojawia się w:
Studia Ekonomiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Biological Absorption of Chemical Elements in Topinambur Plants by Separation of Wastewater in Podzol Soil
Autorzy:
Lopushnyak, Vasyl
Hrytsuliak, Halyna
Kozova, Iryna
Jakubowski, Tomasz
Kotsyubynska, Yulia
Polutrenko, Miroslava
Kozan, Natalia
Powiązania:
https://bibliotekanauki.pl/articles/2173361.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
Jerusalem artichoke
Helianthus tuberosus
sewage sludge
biological uptake
correlation analysis
regression analysis
Opis:
The application of sewage sludge as a fertilizer in podzols soil ambiguously affects the peculiarities of the accumulation of certain chemical elements in various organs of the Jerusalem artichoke plants. Experimental factors in the study were different doses of sewage sludge from sludge maps of wastewater treatment plants and its compost with cereal straw, included together with the compensatory dose of mineral fertilizers to the norm N90P90K90 in the Jerusalem artichoke plantation. Determination of the content of chemical elements in soil and plants was carried out by X-ray fluorescence analysis. According to the results of research, it was established that the change of mineral nutrition conditions of Jerusalem artichoke causes significant changes in the chemical composition of its tubers and vegetative mass. Studies have shown a clear positive effect of increasing doses of SS on increasing the content in tubers: K – to 7.9%, Ca – to 1.9, Fe – to 1.9, in green mass: O – to 31.8%, K – to 31.6, Ca – to 24.9, Mg – to 5.9, Mn – to 0.7, Fe – to 0.4 and K – to 34.5%. The coefficients of biological absorption for most chemical elements are more than 1, but for O, Al, Si, Fe, these figures were less than 1. Regression models of phosphorus, potassium, calcium and magnesium content in the vegetative mass of Jerusalem artichoke indicate a high and moderate dependence of these indicators on their content in Jerusalem artichoke tubers and soil.
Źródło:
Journal of Ecological Engineering; 2022, 23, 9; 18--24
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spatiotemporal analysis of air quality and its relationship with meteorological factors in the Yangtze River Delta
Autorzy:
Li, Y.
Chen, Y.
Karimian, H.
Tao, T.
Powiązania:
https://bibliotekanauki.pl/articles/1192096.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
Tematy:
YRD
air quality index
meteorological elements
correlation analysis
air pollution
spatial analysis
Opis:
Air quality is closely related to people’s health and life. In addition to being directly affected by social activities and atmospheric emissions, the impacts of meteorological factors are also significant. Based on daily Air Quality Index (AQI) data and various meteorological parameters in the Yangtze River Delta (YRD), this paper summarized the spatiotemporal evolution characteristics of AQI over YRD, and quantitatively analyzed the contribution of different meteorological elements to air quality. We also evaluated different spatial interpolation methods to produce surface distribution of AQI, and noted that the Ordinary Kriging outperformed other methods. The spatial distribution of AQI in YRD showed seasonal and annual variations. However, the days with AQI over 100 (level ii) were mostly observed in winter. Generally, more severe air pollution was observed in the northern part of YRD than in the southern ones, for example the air quality of the Ningbo metropolitan area was the best, while in Hefei it was the worst. It was found that meteorological parameters have spatially varying effects on AQI. For instance, pressure has a significant positive effect on AQI, and others showed negative correlations. We also predicted AQI by exploiting different machine learning-based models. Through model comparison, it was found that the Autoregressive Integrated Moving Average Model – ARIMA (0,1,2) has higher prediction accuracy for AQI than Multiple Linear Regression (MLR). The findings of this research can be used in future forecasting of air pollution, and also in air pollution controlling programs.
Źródło:
Journal of Elementology; 2020, 25, 3; 1059-1075
1644-2296
Pojawia się w:
Journal of Elementology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Canonical Correlation Analysis in Panel Vector Error Correction Model. Performance Comparison
Autorzy:
Kębłowski, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/2076457.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
canonical correlation analysis
cointegration
panel VEC model
LCCA
Box-Tiao approach
Opis:
Small sample properties of unrestricted and restricted canonical correlation estimators of cointegrating vectors for panel vector autoregressive process are considered when the cross-sectional dependencies occur in the process generating nonstationary panel data. It is shown that the unrestricted Box-Tiao estimator is slightly outperformed by the unrestricted Johansen estimator if the dynamic properties of the underlying process are correctly specified. The comparison of performance of the restricted canonical correlation estimator of cointegrating vectors for the panel VAR and for the classical VAR applied independently for each cross-section reveals that the latter performs better in small samples when the cross-sectional dependence is limited to the error terms correlations, even though it is inefficient in the limit, but it falls short in comparison to the former when there are cross-sectional dependencies in the short-run dynamics and/or in the long-run adjustments
Źródło:
Central European Journal of Economic Modelling and Econometrics; 2016, 4; 203-217
2080-0886
2080-119X
Pojawia się w:
Central European Journal of Economic Modelling and Econometrics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
IR and NMR spectral LFER study on 3-benzoicacid based sulfonamides
Autorzy:
Dineshkumar, Selvakumar
Thirunarayanan, Ganesamoorthy
Powiązania:
https://bibliotekanauki.pl/articles/1182898.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
3-(substituted phenylsulfonamido)benzoic acids
ir and nmr spectra
correlation analysis
Opis:
A series containing nine 3-(substituted phenylsulfonamido)benzoicacids) have been synthesized and examined their purities by their data reported earlier. The characteristic infrared (NH, SO(as), SO(sym) and CO(as) cm-1) stretches, NMR chemical shifts (δ, ppm) of NH protons, CO carbons were assigned and correlated with Hammett substituent constants and Swain-Lupton’s parameters using single and multi-regression analysis. From
Źródło:
World Scientific News; 2016, 53, 3; 367-384
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 175

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