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81.
Orthogonal block designs in mixture experiments have been extensively studied by various authors. Aggarwal et al. [M.L. Aggarwal, P. Singh, V. Sarin, and B. Husain, Mixture designs in orthogonal blocks using F-squares, METRON – Int. J. Statist. LXVII(2) (2009), pp. 105–128] considered the case of components assuming the same volume fractions and obtained mixture designs in orthogonal blocks using F-squares. In this paper, we have used the class of designs presented by Aggarwal et al. and have obtained D-, A- and E-optimal orthogonal block designs for four components in two blocks for Becker's mixture models and K-model, respectively. Orthogonality conditions for the considered models are also given. 相似文献
82.
Satnam Singh Deol 《Asian Ethnicity》2019,20(2):183-209
ABSTRACTThe study primarily answers the question that whether the movement of Sikh ethnonationalism had been defeated permanently during 1990s or whether it still persists? The study perceives that the movement of Sikh ethnonationalism cannot end till the core pivotal ethnic issues, the moving force of the movement are prevailing. The study eventually predicts that the movement will sooner or later rejuvenate from its previous stage, i.e. militancy, as the sociopolitical circumstances of Punjab have been nourishing microclimate for resurgence of the same. In typical political scenario, the moderate outfit of Sikhs is eager to stimulate the ethnic-regional issues of the Sikhs while the radical factions are also observant to ignite the clinkering Sikh ethnic issues once again. Contrarily, the political aspirations of the BJP controlled by the RSS are opposite to the ethno-political demands of the Sikhs. This contradiction, if aroused systematically, has the potential to rekindle the old spark of militant movement. 相似文献
83.
84.
85.
Sarjinder Singh Stephen Horn & Sadeq Chowdhury 《Australian & New Zealand Journal of Statistics》1998,40(3):291-298
This paper considers the problem of estimating the size and mean value of a stigmatized quantitative character of a hidden gang in a finite population. The proposed method may be applied to solve domestic problems in a particular country or across countries: for example, a government may be interested in estimating the average income of victims or perpetrators of domestic violence. The proposed method is based on the technique introduced by Warner (1965) to estimate the proportion of a sensitive attribute in a finite population without threatening the privacy of the respondents. Expressions for the bias and variance of the proposed estimators are given, to a first order of approximation. Circumstances in which the method can be applied are studied and illustrated using a numerical example. 相似文献
86.
Identifying design criteria for urban system ‘last-mile’ solutions – a multi-stakeholder perspective
AbstractThis study presents a novel approach to design and evaluate ‘last-mile’ solutions – encompassing the social and economic perspectives of key stakeholders. While urban system initiatives have been implemented in practice, theoretical gaps remain at the operational design level. A theoretical framework is developed, based on design criteria identified from a critical synthesis of supply chain and operations management literature, and ‘operationalised’ using an in-depth case study demonstrating implementation of a Consumer Choice Portal-Package Consolidation Centre solution, within a densely populated urban geography. Findings suggest that there is a need to re-define the role of institutional actors beyond that of the traditional governance task, to one of being able to facilitate performance outcomes. Similarly, industrial efficiency dimensions need to be reorientated to include consumer participation, social considerations and multi-stakeholder service outcomes. Finally, implications for operations theory and practising managers in city logistics are highlighted, with suggested directions for future research. 相似文献
87.
Ashish Singh 《Population research and policy review》2011,30(6):861-883
Basic services which are essential for the overall development of a child should not depend on circumstances such as caste,
religion, gender, place of birth, or other parental characteristics, which are beyond his/her control. This paper uses two
rounds of Indian National Family Health Surveys and concepts of Inequality of Opportunity and Human Opportunity Indices to
measure inequality arising out of unequal coverage of full immunization and minimum nutrition for Indian children. The results
suggest overall high level of inequality of opportunity with substantial geographical variations. Changes in inequality of
opportunity in the two services during 1992–1993 to 2005–2006 were mixed with some geographical regions outperforming others.
The findings also call for substantial policy revisions if the goal of universal full immunization and minimum nutrition has
to be achieved. 相似文献
88.
Suppose a finite population of several vertices, each connected to single or multiple edges. This constitutes a structure of graphical population of vertices and edges. As a special case, the graphical population like a binary tree having only two child vertices associated to parent vertex is taken into consideration. The entire binary tree is divided into two sub-graphs such as a group of left-nodes and a group of right-nodes. This paper takes into account a mixture of graph structured and population sampling theory together and presents a methodology for mean-edge-length estimation of left sub-graph using right edge sub-graph as an auxiliary source of information. A node-sampling procedure is developed for this purpose and a class of estimators is proposed containing several good estimators. Mathematical conditions for minimum bias and optimum mean squared error of the class are derived and theoretical results are numerically supported with a test of 99% confidence intervals. It is shown that suggested class has a sub-class of optimum estimators, and sample-based estimates are closer to the true value of the population parameter. 相似文献
89.
In this paper, we suggest regression-type estimators for estimating the Bowley's coefficient of skewness using auxiliary information. To the first degree of approximation, the bias and mean-squared error expressions of the regression-type estimators are obtained, and the regions under which these estimators are more efficient than the conventional estimator are also determined. Further, a general class of estimators of the Bowley's coefficient of skewness is defined along with its properties. A class of estimators based on estimated optimum values is also defined. It is shown to the first degree of approximations that the variance of the class of estimators based on estimated optimum values is the same as that of the minimum variance of the proposed class of estimators. A simulation study is carried out to demonstrate the performance of the proposed difference estimator over the usual estimator. 相似文献
90.
This article addresses the problem of estimating the population mean in stratified random sampling using the information of an auxiliary variable. A class of estimators for population mean is defined with its properties under large sample approximation. In particular, various classes of estimators are identified as particular member of the suggested class. It has been shown that the proposed class of estimators is better than usual unbiased estimator, usual combined ratio estimator, usual product estimator, usual regression estimator and Koyuncu and Kadilar (2009) class of estimators. The results have been illustrated through an empirical study. 相似文献