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61.
Mustapha Rachdi Ali Laksaci Zoulikha Kaid Abbassia Benchiha Fahimah A. Al‐Awadhi 《Statistica Neerlandica》2021,75(1):42-65
We combine the k‐Nearest Neighbors (kNN) method to the local linear estimation (LLE) approach to construct a new estimator (LLE‐kNN) of the regression operator when the regressor is of functional type and the response variable is a scalar but observed with some missing at random (MAR) observations. The resulting estimator inherits many of the advantages of both approaches (kNN and LLE methods). This is confirmed by the established asymptotic results, in terms of the pointwise and uniform almost complete consistencies, and the precise convergence rates. In addition, a numerical study (i) on simulated data, then (ii) on a real dataset concerning the sugar quality using fluorescence data, were conducted. This practical study clearly shows the feasibility and the superiority of the LLE‐kNN estimator compared to competitive estimators. 相似文献
62.
In this paper we consider a financial market with an insider that has, at time t = 0 , some additional information of the whole developing of the market. We use the forward integral, which is an anticipating integral, and the techniques of the Malliavin calculus so that we can take advantage of the privileged information to maximize the expected logarithmic utility from terminal wealth. 相似文献
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64.
单位多圆盘上加权Bergman空间上的紧算子 总被引:1,自引:0,他引:1
记Aφ^p(D^n)(p〉1)为单位多圆盘D^n上P次可积解析函数全体组成的加权Bergman空间.该文利用多圆盘函数论及Schur估计,研究了加权Bergman空间Aφ^p(D^n)上有界算子S满足一定可积条件时的紧性刻画,证明了S为紧的当且仅当其Berezin变换在多圆盘的边界趋于零. 相似文献
65.
目前,基于AHP法构建的供应商选择模型中,均未考虑实际决策时通常有多人参与,并且决策者会给出不同形式评价信息的情况。针对这一问题,将供应商选择视为一种不同形式偏好信息并存的群决策问题,结合AHP法,提出基于OWA算子的供应商选择模型。 相似文献
66.
During the last three decades, integer‐valued autoregressive process of order p [or INAR(p)] based on different operators have been proposed as a natural, intuitive and maybe efficient model for integer‐valued time‐series data. However, this literature is surprisingly mute on the usefulness of the standard AR(p) process, which is otherwise meant for continuous‐valued time‐series data. In this paper, we attempt to explore the usefulness of the standard AR(p) model for obtaining coherent forecasting from integer‐valued time series. First, some advantages of this standard Box–Jenkins's type AR(p) process are discussed. We then carry out our some simulation experiments, which show the adequacy of the proposed method over the available alternatives. Our simulation results indicate that even when samples are generated from INAR(p) process, Box–Jenkins's model performs as good as the INAR(p) processes especially with respect to mean forecast. Two real data sets have been employed to study the expediency of the standard AR(p) model for integer‐valued time‐series data. 相似文献
67.
基于多粒度二元语义的供应商选择方法 总被引:2,自引:1,他引:1
供应商选择是一个多属性决策问题,既包括定性的因素也包括定量的因素。把成本、质量、服务水平、供应商的能力和外部因素作为供应商选择的标准,并将基于多粒度二元语义信息处理的群决策方法应用于供应商的选择,给出了基于二元语义信息处理的群决策的步骤,最后给出了一个算例。 相似文献
68.
Voting operators map n-tuples of subsets of a given set X of candidates (the voters choices) into subsets of X (the social choice). This paper characterizes dictatorial voting operators by means of three conditions (the non-emptiness condition A1, the independence condition A2 and the resoluteness condition A3) motivated by the idea of transferring to the social choice properties common to all the voters choices. The result is used to refine Lahiris (2001) characterization and to derive dictatorial results in other three types of aggregation problems, in which choice functions are transformed into choice functions, binary relations into choices and binary relations into binary relations.Received: 20 May 2002, Accepted: 5 August 2003, JEL Classification:
D70, D71Antonio Quesada: Present address: Departament dEconomia, Facultat de Ciéncies Económiques i Empresarials, Universitat Rovira i Virgili, Avinguda de la Universitat 1, 43204 Reus (Tarragona), Spain. I would like to express my gratitude to the referees for their contribution to improve this paper.Part of this work was done at the Departament dAnálisi Económica, Facultat dEconomia, Universitat de Valéncia, Avinguda dels Tarongers s/n, 46022 Valéncia, Spain. 相似文献
69.
Nick Kontogeorgopoulos Kittinoot Chulikavit 《International Journal of Tourism Research》2010,12(5):627-641
This study provides a supply‐side perspective on ecotourism by exploring the ways in which travel agents and tour operators in Chiang Mai, Thailand conceptualise, prioritise and furnish ecotourism. Although travel agents and tour operators serve as crucial intermediaries between tourists and destinations, the ecotourism literature has largely ignored the ways in which retailers and suppliers of tourism experience approach and define ecotourism. Using quantitative data gathered from 300 travel agents and tour operators, this paper illustrates that the conceptualisation of ecotourism among agents and operators in Chiang Mai is expansive, flexible and, in some ways, internally contradictory. Copyright © 2010 John Wiley & Sons, Ltd. 相似文献
70.