رحیم محمودوند
گروه آمار، دانشگاه بوعلی سینا
[ 1 ] - مقایسه‌ی تجربی مدل‌های باکس- جنکینز، شبکههای عصبی مصنوعی و تحلیل مجموعهی مقادیر تکین در پیش‌بینی سری‌های زمانی
مدل باکس- جنکینز به‌عنوان یک روش پارامتری برای تحلیل سری‌های زمانی و برازش مدل‌های اتورگرسیو و میانگین متحرک فصلی و غیر فصلی بهکار میرود؛ اما این روش برای سری‌های کوتاه مدت و نامانا مناسب نیست. در چنین شرایطی میتوان از روشهای ناپارامتری مانند شبکههای عصبی مصنوعی و تحلیل مجموعهی مقادیر تکین استفاده کرد. هر دو روش از این امتیاز برخوردارند که نیازمند نرمال بودن توزیع خطاها و زیاد بودن تعداد...
[ 2 ] - Grouping Objects to Homogeneous Classes Satisfying Requisite Mass
Grouping datasets plays an important role in many scientific researches. Depending on data features and applications, different constrains are imposed on groups, while having groups with similar members is always a main criterion. In this paper, we propose an algorithm for grouping the objects with random labels, nominal features having too many nominal attributes. In addition, the size constra...
[ 3 ] - Asymmetric Uniform-Laplace Distribution: Properties and Applications
‎The goal of this study is to introduce an Asymmetric Uniform-Laplace (AUL) distribution‎. ‎We present a detailed theoretical description of this distribution‎. ‎We try to estimate the parameters of AUL distribution using the maximum likelihood method‎. ‎Since the likelihood approach results in complicated forms‎, ‎we suggest a bootstrap-based approach for es...
[ 4 ] - A New Modification in the Classical Laplace Distribution
‎Several modifications of the Laplace distribution have been introduced and applied in various fields up to this day‎. ‎In this paper‎, ‎we introduce a modified symmetric version of the classical Laplace distribution‎. ‎We provide a comprehensive theoretical description of this distribution‎. ‎In particular‎, ‎we derive the formulas for th...
[ 5 ] - Predicting the Brexit outcome using singular spectrum analysis
In a referendum conducted in the United Kingdom (UK) on June 23, 2016, $51.6\%$ of the participants voted to leave the European Union (EU). The outcome of this referendum had major policy and financial impact for both UK and EU, and was seen as a surprise because the predictions consistently indicate that the ``Remain'''' would get a majority. In this paper, we investigate whether the outcome o...
[ 6 ] - Descriptive Study of Population Changes in Hamedan Province During Five Years Period 1390-1395
Population changes have undoubtedly impact on policymaking for governmental and private organizations. According to census 1395, North Khorasan province and Hamedan province have experienced a negative population growth rate. Hamedan province with population growth rate -0.23% annually has the lowest rate among all provinces in Iran. Population growth as consequences of several components is c...
Co-Authors