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71.
Ridge regression solves multicollinearity problems by introducing a biasing parameter that is called ridge parameter; it shrinks the estimates as well as their standard errors in order to reach acceptable results. Many methods are available for estimating a ridge parameter. This article has considered some of these methods and also proposed a combined nonlinear programming model and Kibria method. A simulation study has been made to evaluate the performance of the proposed estimators based on the minimum mean squared error criterion. The simulation study indicates that under certain conditions the proposed estimators outperform the least squares (LS) estimators and other popular existing estimators. Moreover, the new proposed model is applied on dataset that suffers also from the presence of heteroscedastic errors. 相似文献
72.
Thomas R. Willemain Ali Allahverdi Philip Desautels Janine ldredge Ozden Gur Gregory Panos 《统计学通讯:模拟与计算》2013,42(4):1043-1075
We compare the performance of seven robust estimators for the parameter of an exponential distribution. These include the debiased median and two optimally-weighted one-sided trimmed means. We also introduce four new estimators: the Transform, Bayes, Scaled and Bicube estimators. We make the Monte Carlo comparisons for three sample sizes and six situations. We evaluate the comparisons in terms of a new performance measure, Mean Absolute Differential Error (MADE), and a premium/protection interpretation of MADE. We organize the comparisons to enhance statistical power by making maximal use of common random deviates. The Transform estimator provides the best performance as judged by MADE. The singly-trimmed mean and Transform method define the efficient frontier of premium/protection. 相似文献
73.
Ali Meghji 《Identities: Global Studies in Culture and Power》2020,27(5):595-613
ABSTRACT Drawing on interviews with thirty-two black British professionals, and ethnographic work in middle-class cultural spaces across London, this paper asks ‘How do the black middle-class use cultural consumption for anti-racism?’ I argue that the black middle-class contest the racial hierarchy at three levels through their cultural consumption: the material, the ideological, and the symbolic. At the material level, black middle-class people consume cultural forms they decode as ‘white’ in order to establish an equity with whites in levels of cultural capital. At the ideological level, black middle-class people consume cultural forms that uplift meanings and representations of blackness, thus challenging controlling images of blackness. Lastly, at the symbolic level, black middle-class folks create and sustain cultural spaces where black people’s cultural and symbolic knowledge is given proper recognition and authority. 相似文献
74.
Hatef Fotuhi Ali Reza Taheriyoun 《Journal of Statistical Computation and Simulation》2019,89(16):3137-3164
In in most cases, the distribution of communications is unknown and one may summarize social network communications with categorical attributes in a contingency table. Due to the categorical nature of the data and a large number of features, there are many parameters to be considered and estimated in the model. Hence, the accuracy of estimators decreases. To overcome the problem of high dimensionality and unknown communications distribution, multiple correspondence analysis is used to reduce the number of parameters. Then the rescaled data are studied in a Dirichlet model in which the parameters should be estimated. Moreover, two control charts, Hotelling’s T2 and multivariate exponentially weighted moving average (MEWMA), are developed to monitor the parameters of the Dirichlet distribution. The performance of the proposed method is evaluated through simulation studies in terms of average run length criterion. Finally, the proposed method is applied to a real case. 相似文献
75.
The winner determination problem (WDP) arises in combinatorial auctions. It is known to be NP-hard. In this paper, we propose a discrete dynamic convexized method for solving this problem. We first propose an adaptive penalty function to convert the WDP into an equivalent unconstrained integer programming problem. Based on the structure of the WDP, we construct an unconstrained auxiliary function, which is maximized iteratively using a local search and is updated whenever a better maximizer is found. By increasing the value of a parameter in the auxiliary function, the maximization of the auxiliary function can escape from previously converged local maximizers. To evaluate the performance of the dynamic convexized method, extensive experiments were carried out on realistic test sets from the literature. Computational results and comparisons show that the proposed algorithm improved the best known solutions on a number of benchmark instances. 相似文献
76.
This paper discusses the role of public sector institutions in the delivery of urban services, with a particular focus on waste management in the Indian Sub-Continent. Public sector institutions are the major stakeholders in the delivery of urban sevices. They hold the major responsibilities, funds and employ a large number of staff. The public sector institutions are also exposed to political influence and the institutional changes are often politically or donors driven. However, since new institutions such as non-government organisations and private sector are taking important roles in the actual delivery of services, there is a greater need to understand the existing linkages to promote integration. The informal sector also provides services to a large number of population. In order to promote efficient and effective delivery of urban services, it is important to work on the integrated approaches involving key stakeholders. 相似文献
77.
Ali Durham Greey 《Revue canadienne de sociologie》2023,60(1):154-164
Increasingly, bills and policies prohibit the participation of trans women in competitive sport. The current sociopolitical moment begs the following question: how do interpersonal interactional moments function alongside formal policies and rules to shape trans athletes’ experiences of belonging in sport? Although formal institutional rules govern trans athletes’ ability to compete in sport, informal social sanctioning also denies these athletes equitable, or even de facto, membership in sport. I draw upon two case studies to explore trans athletes’ experiences of membership in elite “women's” sport. I apply Evelyn Nakano Glenn's work on citizenship to consider how trans athletes’ experiences of belonging are influenced by both formal rules imposed by organizations as well as informal social interactions with members of their sporting communities. Inclusion is not synonymous with membership. Trans athletes render visible the ways in which this system functions to contain the diversity of humanity's gender expression. 相似文献
78.
Ali İ. Genç 《Statistical Papers》2014,55(3):785-803
In this work we derive closed form expressions for the probability density functions and moments of the quotient and product of the components of the bivariate generalized exponential distribution introduced by Kundu and Gupta (J Multivariate Anal, 100:581–593, 2009) and compute the percentage points. The derivations will be useful for practitioners of this bivariate model. We then give a real data application of the product. 相似文献
79.
Over the last few decades several countries have turned to inflation targeting as a policy choice for instilling stability into their economies. Prior studies have shown that inflation targeting has reduced inflation in those countries without significantly impacting GDP. This study seeks to improve upon these results by identifying the impact of timing on the policy decision as well as its impact as related to specific regions of the world. The focus is on developing countries across six regions. We find significant regional variation in developing countries in our sample in terms of the direction of changes in inflation following a switch to the inflation targeting policy. Moreover, although the impact of inflation targeting on real GDP is minimal overall, there is a statistically significant increase in real GDP among developing countries in certain regions only, namely, Europe, Latin America, and the Middle East. 相似文献
80.
Process capability (PC) indices measure the ability of a process of interest to meet the desired specifications under certain restrictions. There are a variety of capability indices available in literature for different interest variables such as weights, lengths, thickness, and the life time of items among many others. The goal of this article is to study the generalized capability indices from the Bayesian view point under different symmetric and asymmetric loss functions for the simple and mixture of generalized lifetime models. For our study purposes, we have covered a simple and two component mixture of Maxwell distribution as a special case of the generalized class of models. A comparative discussion of the PC with the mixture models under Laplace and inverse Rayleigh are also included. Bayesian point estimation of maintenance performance of the system is also part of the study (considering the Maxwell failure lifetime model and the repair time model). A real-life example is also included to illustrate the procedural details of the proposed method. 相似文献