نتایج جستجو برای: principal component analyses

تعداد نتایج: 1055377  

Journal: :تحقیقات علوم رفتاری 0
جعفر حسنی jafar hasani

aim and background: the aim of the present study was to develop a short form of the persian version of the cognitive emotion regulation questionnaire (cerq-p-short) and to examine its reliability and validity. methods and materials: the cerq-p was administrated to 420 (220 male and 200 female) iranian university students in 2009-2010 academic year. following stepwise omission of the items with ...

Journal: :Physical review 2021

Principal component analysis (PCA) has been applied to analyze random fields in various scientific disciplines. However, the explainability of PCA remains elusive unless strong domain-specific knowledge is available. This paper provides a theoretical framework that builds duality between eigenmodes field and eigenstates Schr\"odinger equation. Based on we propose algorithm replace expensive sol...

Journal: :research in pharmaceutical sciences 0
m shahlaei a fassihi a nezami

in the present study, quantitative relationships between molecular structure and anti-tubercular activity of some 5-methyl/trifluoromethoxy-1 h -indole-2,3-dione-3-thiosemicarbazone derivatives were discovered. the detailed application of an efficient linear method and principal component regression (pcr) for the evaluation of quantitative structure activity relationships of the studied compound...

Journal: :علوم دامی ایران 0
محمدرضا بختیاری زاده دانشجوی دوره دکتری پردیس کشاورزی و منابع طبیعی دانشگاه تهران، محمد مرادی شهربابک استاد پردیس کشاورزی و منابع طبیعی دانشگاه تهران، حسین مرادی شهربابک استادیارپردیس کشاورزی و منابع طبیعی دانشگاه تهران، محمود وطن خواه دانشیار دانشگاه آزاد اسلامی، واحد شهرکرد

the relationship between live body weight, body length, girth circumference, animal hight, upper, middle as well as lower width of fat-tail, fat-tail length, fat-tail gap length, fat-tail depth and fat-tail circumference along with fat-tail weight were determined using records of 731 loribakhtiari sheep. principal component and least square analyses were applied to solve the collinearity instab...

1997
Michael E. Tipping Christopher M. Bishop Peter Dayan Bernhard Schölkopf Alexander Smola Klaus-Robert Müller

Your use of the JSTOR archive indicates your acceptance of JSTOR's Terms and Conditions of Use, available at http://www.jstor.org/page/info/about/policies/terms.jsp. JSTOR's Terms and Conditions of Use provides, in part, that unless you have obtained prior permission, you may not download an entire issue of a journal or multiple copies of articles, and you may use content in the JSTOR archive o...

2002
Jakob J. Verbeek Nikos A. Vlassis Ben J. A. Kröse

Mixtures of Principal Component Analyzers can be used to model high dimensional data that lie on or near a low dimensional manifold. By linearly mapping the PCA subspaces to one global low dimensional space, we obtain a ‘global’ low dimensional coordinate system for the data. As shown by Roweis et al., ensuring consistent global low-dimensional coordinates for the data can be expressed as a pen...

2005
JAN DE LEEUW

A. Two quite different forms of nonlinear principal component analysis have been proposed in the literature. The first one is associated with the names of Guttman, Burt, Hayashi, Benzécri, McDonald, De Leeuw, Hill, Nishisato. We call itmultiple correspondence analysis. The second form has been discussed by Kruskal, Shepard, Roskam, Takane, Young, De Leeuw, Winsberg, Ramsay. We call it no...

2004
Jun Liu Songcan Chen Zhi-Hua Zhou

Principal Component Analysis (PCA) is a feature extraction approach directly based on a whole vector pattern and acquires a set of projections that can realize the best reconstruction for an original data in the mean squared error sense. In this paper, the progressive PCA (PrPCA) is proposed, which could progressively extract features from a set of given data with large dimensionality and the e...

2002
Mohamed N. Nounou Bhavik R. Bakshi Prem K. Goel Xiaotong Shen

Principal component analysis (PCA) is a dimensionality reduction modeling technique that transforms a set of process variables by rotating their axes of representation. Maximum Likelihood PCA (MLPCA) is an extension that accounts for different noise contributions in each variable. Neither PCA nor its extensions utilize external information about the model or data such as the range or distributi...

2011
Wieland Brendel Ranulfo Romo Christian K. Machens

In many experiments, the data points collected live in high-dimensional observation spaces, yet can be assigned a set of labels or parameters. In electrophysiological recordings, for instance, the responses of populations of neurons generally depend on mixtures of experimentally controlled parameters. The heterogeneity and diversity of these parameter dependencies can make visualization and int...

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