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Wyświetlanie 1-10 z 174
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:
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:
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:
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
Wyświetlanie 1-10 z 174

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