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<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">mrisel</journal-id><journal-title-group><journal-title xml:lang="en">Magnetic Resonance in Solids</journal-title><trans-title-group xml:lang="ru"><trans-title>Magnetic Resonance in Solids</trans-title></trans-title-group></journal-title-group><issn pub-type="epub">2072-5981</issn><publisher><publisher-name>Kazan Federal University</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.26907/mrsej-19308</article-id><article-id custom-type="elpub" pub-id-type="custom">mrisel-58</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>Статьи</subject></subj-group></article-categories><title-group><article-title>New approach in correlation analysis</article-title><trans-title-group xml:lang="ru"><trans-title></trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="western" xml:lang="en"><surname>Nigmatullin</surname><given-names>R. R.</given-names></name></name-alternatives><bio xml:lang="en"><p>Kazan 420111</p></bio><email xlink:type="simple">renigmat@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff xml:lang="en" id="aff-1"><institution>Kazan National Research Technical University (KAI)</institution><country>Russian Federation</country></aff><pub-date pub-type="collection"><year>2019</year></pub-date><pub-date pub-type="epub"><day>19</day><month>04</month><year>2019</year></pub-date><volume>21</volume><issue>3</issue><issue-title>SPECIAL ISSUE dedicated to Boris I. Kochelaev's 85th birthday</issue-title><elocation-id>19308 (18 pp.)</elocation-id><permissions><copyright-statement>Copyright &amp;#x00A9; Nigmatullin R.R., 2024</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="ru">Nigmatullin R.R.</copyright-holder><copyright-holder xml:lang="en">Nigmatullin R.R.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://www.mrsej.ru/jour/article/view/58">https://www.mrsej.ru/jour/article/view/58</self-uri><abstract><p>In this paper, a new method for restoration of the desired correlations is proposed. It allows to evaluate the "content" of the external factors (l = 1, 2,..., L) setting in the form of data arrays ym(l)(x) (m = 1, 2,..., M) inside the given Ym(x) function that is supposed to be subjected by the influence of these factors. As contrasted to the conventional correlation analysis, the proposed method allows finding the "influence" functions bl(x) (l = 1, 2,..., L) and evaluating the "remnant" array Gm(x) that is remained as a "quasi-independent" part from the influence of the factors ym(l)(x). The general expression works as a specific "balance" and reproduces the wellknows cases, when bl(x) = Cl (it is reduced to the linear least square method with Gm(x) ≅ 0) and coincides with the remnant function Ym(x) ≅ Gm(x), when the influence functions becomes negligible (bl(x) ≅ 0). The available data show that the proposed method allows to extract a small signal from the "pattern" background and it conserves its stability/robustness in the presence of a random fluctuations/noise. The method is rather flexible and allows to consider the cases of strong correlations, when the external factors act successively, forming the causeand-effect chains. It can be generalized for expressions containing the bonds expressed in the form of memory functions. The proposed method adds new quantitative ties expressed in the form of the desired functions to the conventional correlation relationships expressed in the form of the correlation coefficients forming, in turn, the correlation matrices. New relationships allow to understand deeper the existing correlations and make them more informative, especially in detection of the desired deterministic and stable bonds/laws that can be hidden inside.</p></abstract><kwd-group xml:lang="en"><kwd>correlations</kwd><kwd>functional least-square method</kwd><kwd>extraction of a small signal</kwd><kwd>influence and remnant functions</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Haghighat M., Abdel-Mottaleb M., Alhalabi W. IEEE Transactions on Information Forensics and Security 11, 1984 (2016)</mixed-citation><mixed-citation xml:lang="en">Haghighat M., Abdel-Mottaleb M., Alhalabi W. IEEE Transactions on Information Forensics and Security 11, 1984 (2016)</mixed-citation></citation-alternatives></ref><ref id="cit2"><label>2</label><citation-alternatives><mixed-citation xml:lang="ru">Sen P.K. 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