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The Marshall-Olkin Topp-Leone Half-Logistic-G Family of Distributions with Applications Marshall-Olkin Topp-Leone半logistic - g族分布及其应用
Pub Date : 2023-08-07 DOI: 10.19139/soic-2310-5070-1082
Whatmore Sengweni, B. Oluyede, B. Makubate
A new family of distributions called the Marshall-Olkin Topp-Leone Half-Logistic-G (MO-TLHL-G) family of distributions is proposed and studied. Structural properties of the new family of distributions including moments, incomplete moments, distribution of the order statistics, and Renyi entropy are derived. The maximum likelihood estimation technique is used to estimate the model parameters. A simulation study to examine the bias and mean square error of the maximum likelihood estimators and applications to real data sets to illustrates the usefulness of the generalized distribution are given.
提出并研究了一种新的分布族,称为Marshall-Olkin Topp-Leone半logistic - g (MO-TLHL-G)分布族。导出了新的分布族的结构性质,包括矩、不完全矩、序统计量分布和Renyi熵。采用极大似然估计技术对模型参数进行估计。通过仿真研究检验了极大似然估计的偏差和均方误差,并在实际数据集上进行了应用,以说明广义分布的有效性。
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引用次数: 0
Mean-TVaR Models for Diversified Multi-period Portfolio Optimization with Realistic Factors based on Uncertainty Theory 基于不确定性理论的具有现实因素的多元化多期投资组合优化均值- tvar模型
Pub Date : 2023-08-06 DOI: 10.19139/soic-2310-5070-1657
Khalid Belabbes, El Hachloufi Mostafa, Guennoun Zine El Abidine
The focus of any portfolio optimization problem is to imitate the stock markets and propose the optimal solutions to dealing with diverse investor expectations. In this paper, we propose new multi-period portfolio optimization problems when security returns are uncertain variables, given by experts’ estimations, and take the Tail value at risk (TVaR) as a coherent risk measure of investment in the framework of uncertainty theory. Real- constraints, in which transaction costs, liquidity of securities, and portfolio diversification, are taken into account. Equivalent deterministic forms of mean–TVaR models are proposed under the assumption that returns and liquidity of the securities obey some types of uncertainty distributions. We adapted the Delphi method in order to evaluate the expected, the standard deviation and the turnover rates values of returns of the given securities. Finally, numerical examples are given to illustrate the effectiveness of the proposed models.
任何投资组合优化问题的重点都是模仿股票市场,并提出最优解决方案来处理投资者的不同期望。本文在不确定性理论的框架下,将风险尾值(TVaR)作为投资的一致风险度量,提出了以专家估计为不确定变量的多时期投资组合优化问题。实际约束,包括交易成本、证券流动性和投资组合多样化。在证券收益率和流动性服从某种不确定性分布的假设下,提出了均值- tvar模型的等价确定性形式。本文采用德尔菲法对给定证券的收益率期望值、标准差和换手率进行了评估。最后,通过数值算例说明了所提模型的有效性。
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引用次数: 0
A Discrete New Generalized Two Parameter Lindley Distribution: Properties, Estimation and Applications 一种新的离散广义双参数Lindley分布:性质、估计及应用
Pub Date : 2023-08-06 DOI: 10.19139/soic-2310-5070-1392
Manal M. Salem, Moshira A. Ismail
In this paper, a discrete new generalized two parameter Lindley distribution is proposed. Discrete Lindley and Geometric distributions are sub-models of the proposed distribution. Its probability mass function exhibits different shapes including decreasing, unimodal and decreasing-increasing-decreasing. Our proposed distribution has only two-parameters and its hazard rate function can accommodate increasing, constant, decreasing and bathtub shapes. Moreover, this distribution can describe equi and over dispersed data. Several distributional properties are obtained and several reliability characteristics are derived such as cumulative distribution function, hazard rate function, second hazard rate  function, mean residual life function, reverse hazard rate function, accumulated hazard rate function and also its order statistics. In addition, the study of the shapes of the hazard rate function is provided analytically and also by plots. Estimation of the parameters is done using the maximum likelihood method. A simulation study is conducted to assess the performance of the maximum likelihood estimators. Finally, the flexibility of the model is illustrated using three real data sets.
提出了一种新的离散型广义双参数林德利分布。离散林德利分布和几何分布是所提出分布的子模型。其概率质量函数表现为递减型、单峰型和递减-递增-递减型。我们提出的分布只有两个参数,其危险率函数可以适应增加、恒定、减少和浴缸形状。此外,这种分布可以描述均匀和过分散的数据。得到了累积分布函数、危险率函数、二次危险率函数、平均剩余寿命函数、逆向危险率函数、累积危险率函数及其序统计量等若干可靠性特性。此外,还对危险率函数的形状进行了分析和图解研究。参数的估计是用极大似然法完成的。通过仿真研究对最大似然估计器的性能进行了评估。最后,用三个实际数据集说明了该模型的灵活性。
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引用次数: 0
Nonparametric tests of independence using copula-based Renyi and Tsallis divergence measures 使用基于copula的Renyi和Tsallis散度度量的非参数独立性检验
Pub Date : 2023-08-05 DOI: 10.19139/soic-2310-5070-1691
M. Mohammadi, Mahdi Emadi
‎We introduce new nonparametric independence tests based on R'enyi and Tsallis divergence measures and copula density function‎. ‎These tests reduce the complexity of calculations because they only depend on the copula density‎. ‎The copula density estimated using the local likelihood probit-transformation method is appropriate for the identification of independence‎. ‎Also‎, ‎we present the consistency of the copula-based R'enyi and Tsallis divergence measures estimators that are considered as test statistics‎. ‎A simulation study is provided to compare the empirical power of these new tests with the independence test based on the empirical copula‎. ‎The simulation results show that the suggested tests outperform in weak dependency‎. ‎Finally‎, ‎an application in hydrology is presented‎.
我们引入了新的基于R enyi和Tsallis散度测度和copula密度函数的非参数独立性检验。这些测试降低了计算的复杂性,因为它们只依赖于联结密度。使用局部似然概率变换方法估计的联结密度适合于独立性的识别。此外,我们提出了基于copula的R enyi和Tsallis散度度量估计量的一致性,这些估计量被认为是检验统计量。通过仿真研究,将这些新检验的经验威力与基于经验联结的独立性检验进行了比较。仿真结果表明,所提出的测试方法在弱依赖性方面表现优异。最后,介绍了在水文学中的应用。
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引用次数: 0
Strong consistency of a deconvolution estimator of cumulative distribution function 累积分布函数反褶积估计量的强相合性
Pub Date : 2023-08-05 DOI: 10.19139/soic-2310-5070-1732
Trang Bui Thuy, Cao Xuan Phuong
We study the strong consistency of a deconvolution estimator of cumulative distribution function when the distribution of error variable is assumed to be known exactly and ordinary smooth as well as supersmooth.
研究了当误差变量的分布是精确已知的、普通光滑和超光滑时,累积分布函数的反褶积估计量的强相合性。
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引用次数: 0
Sine-Cosine Weighted Circular Distributions 正弦余弦加权圆形分布
Pub Date : 2023-08-05 DOI: 10.19139/soic-2310-5070-1681
F. Shahsanaei, Rahim Chinipardaz
This paper introduces a new family of multimodal and skew-symmetric circular distributions, namely, the sine-cosine weighted circular distribution. The fundamental properties of this family are examined in the context of a general case and three specific examples. Additionally, general solutions for estimating the parameters of any sine-cosine weighted circular distribution using maximum likelihood are provided. A likelihood-ratio test is performed to check the symmetry of the data. Lastly, two examples are presented that illustrate how the proposed model may be utilized to analyze two real-world case studies with asymmetric datasets.
本文介绍了一类新的多模态偏对称圆形分布,即正弦-余弦加权圆形分布。这个家族的基本性质是在一个一般案例和三个具体例子的背景下进行检查的。此外,给出了利用极大似然估计任意正弦余弦加权圆形分布参数的一般解。进行似然比检验以检验数据的对称性。最后,给出了两个例子,说明了所提出的模型如何用于分析具有不对称数据集的两个现实世界案例研究。
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引用次数: 0
Isomorphism Check for Two-level Multi-Stage Factorial Designs with Randomization Restrictions via an R Package: IsoCheck 基于R包的具有随机化限制的两水平多阶段析因设计的同构检验:IsoCheck
Pub Date : 2023-08-05 DOI: 10.19139/soic-2310-5070-1494
Pratishtha Batra, Neil Spencer, Pritam Ranjan
Factorial designs are often used in various industrial and sociological experiments to identify significant factors and factor combinations that may affect the process re- sponse. In the statistics literature, several studies have investigated the analysis, con- struction, and isomorphism of factorial and fractional factorial designs. When there are multiple choices for a design, it is helpful to have an easy-to-use tool for identifying which are distinct, and which of those can be efficiently analyzed/has good theoretical properties. For this task, we present an R library called IsoCheck that checks the isomorphism of multi-stage 26n factorial experiments with randomization restrictions. Through representing the factors and their combinations as a finite projective geometry, IsoCheck recasts the problem of searching over all possible relabelings as a search over collineations, then exploits projective geometric properties of the space to make the search much more efficient. Furthermore, a bitstring representation of the factorial effects is used to characterize all possible rearrangements of designs, thus facilitating quick comparisons after relabeling. This paper presents several detailed examples with R codes that illustrate the usage of the main functions in IsoCheck. Besides checking equivalence and isomorphism of 2^n multi-stage factorial designs, we demonstrate how the functions of the package can be used to create a catalog of all non-isomorphic designs, and good designs as per a suitably defined ranking criterion.
析因设计常用于各种工业和社会学实验中,以确定可能影响过程反应的重要因素和因素组合。在统计文献中,一些研究调查了析因和分数析因设计的分析、构造和同构性。当设计有多种选择时,有一个易于使用的工具来识别哪些是不同的,哪些可以有效地分析/具有良好的理论属性是很有帮助的。对于这项任务,我们提出了一个名为IsoCheck的R库,用于检查具有随机化限制的多阶段26n析因实验的同构性。通过将因子及其组合表示为有限射影几何,IsoCheck将搜索所有可能重新标记的问题转换为对共线的搜索,然后利用空间的射影几何特性使搜索更加高效。此外,阶乘效应的位串表示用于描述所有可能的设计重排,从而促进重新标记后的快速比较。本文用R代码给出了几个详细的例子,说明了IsoCheck中主要函数的用法。除了检查2^n多阶段析因设计的等价性和同构性外,我们还演示了如何使用包的功能来创建所有非同构设计的目录,以及根据适当定义的排序标准的好设计。
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引用次数: 0
Copula based learning for directed acyclic graphs 有向无环图的Copula学习
Pub Date : 2023-08-03 DOI: 10.19139/soic-2310-5070-1634
Russul Mohsin, Vahid Rezaei Tabar
We provide the learning of a DAG model arising from high dimensional random variables following both normal and non-normal assumptions. To this end, the copula function utilized connecting dependent variables. Moreover to normal copula, the three most applicable copulas have been investigated modeling all three dependence structures negative, positive, and weak kinds. The copula functions, FGM, Clayton, and Gumbel are considered coving these situations and their detailed calculations are also presented. In addition, the structure function has been exactly determined due to choosing a good copula model based on statistical software R with respect to any assumed direction among all nodes. The direction with the maximum structure function has been preferred. The corresponding algorithms finding these directions and the maximization procedures are also provided. Finally, some extensive tabulations and simulation studies are provided, and in the following to have a clear thought of provided strategies, a real world application has been analyzed.
我们提供了一个由高维随机变量产生的DAG模型的学习,该模型遵循正态和非正态假设。为此,copula函数采用了连接因变量的方法。此外,本文还研究了三种最适用的联结关系,分别对负、正、弱三种依赖结构进行了建模。考虑了这些情况下的联结函数、FGM、Clayton和Gumbel,并给出了它们的详细计算。此外,在所有节点之间的任意假设方向上,基于统计软件R选择了一个良好的copula模型,从而精确地确定了结构函数。优先选择结构功能最大的方向。给出了相应的求方向算法和最大化过程。最后,提供了一些广泛的制表和模拟研究,并在以下对所提供的策略有一个清晰的想法,分析了一个现实世界的应用。
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引用次数: 0
Random forests in the zero to k inflated Power series populations 0到k膨胀幂级数种群中的随机森林
Pub Date : 2023-08-03 DOI: 10.19139/soic-2310-5070-1773
H. Saboori, Mahdi Doostparast
Tree-based algorithms are a class of useful, versatile, and popular tools in data mining and machine learning.Indeed, tree aggregation methods, such as random forests, are among the most powerful approaches to boostthe performance of predictions. In this article, we apply tree-based methods to model and predict discretedata, using a highly flexible model. Inflation may occur in discrete data at some points. Inflation can beat points as zero, one or the other. We may even have inflation at two points or more. We use models forinflated data sets based on a common discrete family (the Power series models). The Power series modelsare one of the most famous families used in such models. This family includes common discrete models suchas the Poisson, Negative Binomial, Multinomial, and Logarithmic series models.The main idea of this article is to use zero to k (k = 0, 1, . . .) inflated regression models based on the familyof power series to fit decision regression trees and random forests. An important point of these models isthat they can be used not only for inflated discrete data but also for non-inflated discrete data. Indeed thismodel can be used for a wide range of discrete data sets.
基于树的算法是数据挖掘和机器学习中一类有用的、通用的和流行的工具。事实上,树聚合方法,如随机森林,是提高预测性能的最有力的方法之一。在本文中,我们使用高度灵活的模型,应用基于树的方法来建模和预测离散数据。通货膨胀可能在某些点上出现在离散的数据中。通货膨胀可以超过零点,也可以低于零点。我们甚至可能有两个百分点甚至更高的通货膨胀。我们使用基于常见离散族(幂级数模型)的膨胀数据集模型。Power系列模型是此类模型中使用的最著名的家族之一。这个家族包括常见的离散模型,如泊松,负二项式,多项和对数系列模型。本文的主要思想是使用基于幂级数族的0到k (k = 0,1,…)膨胀回归模型来拟合决策回归树和随机森林。这些模型的一个重要特点是它们不仅可以用于膨胀的离散数据,也可以用于非膨胀的离散数据。事实上,这个模型可以用于广泛的离散数据集。
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引用次数: 0
Analysis and Applications of Quantile Approach on Residual Extropy 残差外向性的分位数法分析及应用
Pub Date : 2023-08-03 DOI: 10.19139/soic-2310-5070-1226
A. H. Khammar, Vahideh Ahrari, Seyed Mahdi Amir Jahanshahi
Extropy is a measure of the uncertainty of a random variable. Motivated with the wideapplicability of quantile functions in modeling and analyzing statistical data, in this paper, we studyquantile version of the extropy from residual lifetime variable, "residual quantile extropy" in short.Unlike the residual extropy function, the residual quantile extropy determines the quantile densityfunction uniquely through a simple relationship. Aging classes, stochastic orders and characterizationresults are derived, using proposed quantile measure of uncertainty. We also suggest some applicationsrelated to (n i + 1)-out-of-n systems and distorted random variables. Finally, a nonparametricestimator for residual quantile extropy is provided. In order to evaluate of proposed estimator, we usea simulation study.
外性是对随机变量不确定性的度量。考虑到分位数函数在统计数据建模和分析中的广泛适用性,本文从残差寿命变量出发,研究了残差寿命变量的分位数型外向性,简称残差分位数外向性。与残差外向性函数不同,残差分位数外向性通过一个简单的关系唯一地决定了分位数密度函数。使用提出的不确定性分位数度量,推导了老化类别、随机顺序和表征结果。我们还提出了与(n i + 1)- of-n系统和扭曲随机变量相关的一些应用。最后给出了残差分位数熵的非参数估计。为了对所提出的估计器进行评估,我们进行了仿真研究。
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引用次数: 0
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Statistics, Optimization & Information Computing
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