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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="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">cheb</journal-id><journal-title-group><journal-title xml:lang="ru">Чебышевский сборник</journal-title><trans-title-group xml:lang="en"><trans-title>Chebyshevskii Sbornik</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2226-8383</issn><publisher><publisher-name>Tula State Lev Tolstoy  Pedagogical University</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.22405/2226-8383-2022-23-3-255-261</article-id><article-id custom-type="elpub" pub-id-type="custom">cheb-1361</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>Краткие сообщения</subject></subj-group></article-categories><title-group><article-title>О плотности распределения вероятностей агрегированной случайной величины для оценки функционирования сложных систем: трехмерный случай</article-title><trans-title-group xml:lang="en"><trans-title>On the probability distribution densities of an aggregated random variable for evaluating the functioning of complex systems: a three-dimensional case</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Жуков</surname><given-names>Роман Александрович</given-names></name><name name-style="western" xml:lang="en"><surname>Zhukov</surname><given-names>Roman Aleksandrovich</given-names></name></name-alternatives><bio xml:lang="ru"><p>кандидат физико-математических наук</p></bio><bio xml:lang="en"><p> candidate of physics and mathematics sciences</p></bio><email xlink:type="simple">pluszh@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Козлова</surname><given-names>Надежда Олеговна</given-names></name><name name-style="western" xml:lang="en"><surname>Kozlova</surname><given-names>Nadezhda Olegovna</given-names></name></name-alternatives><bio xml:lang="ru"><p>кандидат технических наук</p></bio><bio xml:lang="en"><p>candidate of technical sciences</p></bio><email xlink:type="simple">95kno@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Тульский филиал Финансового университета при Правительстве РФ</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Financial University under the Government of the Russian Federation (Tula Branch)</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2022</year></pub-date><pub-date pub-type="epub"><day>31</day><month>12</month><year>2022</year></pub-date><volume>23</volume><issue>3</issue><fpage>255</fpage><lpage>261</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Жуков Р.А., Козлова Н.О., 2022</copyright-statement><copyright-year>2022</copyright-year><copyright-holder xml:lang="ru">Жуков Р.А., Козлова Н.О.</copyright-holder><copyright-holder xml:lang="en">Zhukov R.A., Kozlova N.O.</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.chebsbornik.ru/jour/article/view/1361">https://www.chebsbornik.ru/jour/article/view/1361</self-uri><abstract><p>Построена плотность распределения вероятностей агрегированной случайной величины, используемая для оценки параметров агрегированной производственной функции, определяемой квадратичной сверткой производственных функций, характеризующих частные результаты функционирования элементов сложной системы. Получены соотношения в квадратурах для трехмерного случая.</p></abstract><trans-abstract xml:lang="en"><p>The probability distribution density of an aggregated random variable is constructed, which is used to estimate the parameters of an aggregated production function determined by a quadratic convolution of production functions characterizing the particular results of the functioning of elements of a complex system. The relations in quadratures for the threedimensionalcase are obtained.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>плотность распределения вероятностей</kwd><kwd>производственная функция</kwd><kwd>агрегирование</kwd><kwd>модель</kwd><kwd>сложная система.</kwd></kwd-group><kwd-group xml:lang="en"><kwd>probability distribution density</kwd><kwd>production function</kwd><kwd>aggregation</kwd><kwd>model</kwd><kwd>complex system.</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Исследование выполнено за счет гранта Российского научного фонда № 22-28-20061, https://rscf.ru/project/ 22-28-20061/ и Тульской области</funding-statement><funding-statement xml:lang="en">The study was carried out at the expense of a grant from the Russian science Foundation № 22-28-20061, https://rscf.ru/project/22-28-20061/ and Tula region</funding-statement></funding-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Клейнер Г. 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