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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">donstu</journal-id><journal-title-group><journal-title xml:lang="en">Advanced Engineering Research (Rostov-on-Don)</journal-title><trans-title-group xml:lang="ru"><trans-title>Advanced Engineering Research (Rostov-on-Don)</trans-title></trans-title-group></journal-title-group><issn pub-type="epub">2687-1653</issn><publisher><publisher-name>Don State Technical University</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.12737/2014</article-id><article-id custom-type="elpub" pub-id-type="custom">donstu-435</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="en"><subject>PHYSICAL AND MATHEMATICAL SCIENCES</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>ФИЗИКО-МАТЕМАТИЧЕСКИЕ НАУКИ</subject></subj-group></article-categories><title-group><article-title>STOCK MARKET FLUCTUATIONS SIMULATION WITHIN LOWLY VOLATILE AND HIGHLY VOLATILE PERIODS</article-title><trans-title-group xml:lang="ru"><trans-title>Моделирование биржевых колебаний в низковолатильные и высоковолатильные периоды</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>Кириллов</surname><given-names>Кирилл Валерьевич</given-names></name><name name-style="western" xml:lang="en"><surname>Kirillov</surname><given-names>Kirill Valeryevich</given-names></name></name-alternatives><email xlink:type="simple">k.kirillov@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Кубанский государственный университет.</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Kuban State University</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2013</year></pub-date><pub-date pub-type="epub"><day>30</day><month>12</month><year>2013</year></pub-date><volume>13</volume><issue>7-8</issue><fpage>5</fpage><lpage>14</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Kirillov K.V., 2013</copyright-statement><copyright-year>2013</copyright-year><copyright-holder xml:lang="ru">Кириллов К.В.</copyright-holder><copyright-holder xml:lang="en">Kirillov K.V.</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.vestnik-donstu.ru/jour/article/view/435">https://www.vestnik-donstu.ru/jour/article/view/435</self-uri><abstract><p>The simulation of stock price fluctuations is analyzed. The statistical criteria application allows drawing the conclusion on the investigated models’ validity. Alongside with well-known Kolmogorov-Smirnov and Anderson-Darling criteria, comparatively new Christoffersen and Berkowitz criteria are used to assess interval predictions. Berkowitz criterion is particularly effective when used to assess extreme price leaps within highly volatile periods, since it gives good results also for a small number of observations. It is shown that the customarily used time-series models with normal distribution and with Student distribution are applicable exclusively during relatively stable periods. Under the unstable conditions at the financial markets, models by means of which it is possible to describe a high probability of great price leaps are required. The time-series model with the heavy tailed distribution is studied. The recommendations on the portfolio management under the crisis time are provided on the basis of the performed calculations.</p></abstract><trans-abstract xml:lang="ru"><p>Анализируется моделирование колебаний цен на акции. Применение статистических критериев позволяет сделать выводы о пригодности исследуемых моделей. Наряду с широко известными критериями Колмогорова-Смирнова и Андерсона-Дарлинга применяются критерии Кристофферсона и Берковича, которые были сравнительно недавно разработаны для оценки интервальных прогнозов. Критерий Берковича особенно ценен для оценки экстремальных скачков цен в высоковолатильные периоды, так как он даёт хорошие результаты и в том случае, когда количество наблюдений невелико. Показано, что традиционно применяемые модели временных рядов с нормальным распределением и распределением Стьюдента применимы только в относительно стабильные периоды. В условиях нестабильности на финансовых рынках необходимы модели, с помощью которых можно описать высокую вероятность больших скачков цен. Анализируется модель временного ряда с распределением «с тяжёлыми концами». На основе проведённых расчётов формулируются рекомендации по управлению фондовым портфелем в кризисные периоды.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>ARMA-GARCH модель</kwd><kwd>Value-at-Risk (VaR)</kwd><kwd>Average Value-at-Risk (AVaR)</kwd><kwd>временные ряды</kwd><kwd>распределения «с тяжёлыми хвостами».</kwd></kwd-group><kwd-group xml:lang="en"><kwd>ARMA-GARCH model</kwd><kwd>Value-at-Risk (VaR)</kwd><kwd>Average Value-at-Risk (AVaR)</kwd><kwd>time series</kwd><kwd>heavy-tailed distributions.</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Работа выполнена при поддержке стипендии Президента России (2011—2012 гг.).</funding-statement><funding-statement xml:lang="en">The research is done with the support of the Russian Presidential Scholarship (2011—2012).</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">Engle, R. 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