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81.
This article presents a proposal for customer segmentation through Support Vector Clustering, a technique that has been gaining attention in the academic literature due to the good results usually obtained. An application of this method to a sample from consumers in Brazil about mobile TV service is performed; we compare this approach with the classical hierarchical methods of cluster analysis. It is concluded that this methodology is effective in reducing the heterogeneity often present in customers’ data, improving the cluster segmentation analysis for managers. 相似文献
82.
Five tests for the hypothesis of no treatment effects in complete blocks designs are compared with respect to asymptotic relative efficiency: the ordinary two-way analysis of variance, the analysis of variance of ranks (Friedman, 1937), the method of ranking after alignment (Hodges and Lehmann, 1962), and a method of weighted rankings proposed by Quade (1972, 1979). This comparison required devising a procedure for estimating the asymptotic relative efficiencies of test statistics with asymp-totic chi-squared distributions. 相似文献
83.
Claudio Cruz-Cázares Cristina Bayona-Sáez Teresa García-Marco 《Journal of Engineering and Technology Management》2013,30(3):227-245
The aim of this paper is to increase our knowledge of a firm's innovative behaviour by jointly analysing its internal resources, industry characteristics and appropriability conditions as drivers of its R&D strategy selection: make, buy and make-buy. Based on panel data (1992–2005) covering 1539 Spanish manufacturing firms, results show that firms lacking organisational resources and competing in stable markets prefer the buy strategy. Firms with a high level of technological resources that are immersed in high-tech industries are prone to selecting the make-buy strategy. Internationalised firms with high levels of appropriability prefer the make strategy. 相似文献
84.
Corazon Pe Benito Claudio 《Risk analysis》1988,8(4):475-478
In summary, risk analysis is not yet well practiced in developing countries, although there are numerous, diverse environmental and other risk-related issues and concerns that need attention. A few initiatives have been taken, but, so far, they have created only relatively small impact in a few areas. Many risk issues may not be addressed, partly as a result of lack of resources and inadequate knowledge by policy makers. Risk analysis is an essential tool for the planning and implementation of development projects. To enhance its use, however, risk analysis approaches and methods must be adapted to developing countries, and this requires research. Unfortunately, funds for research, in general, are hard to find. There are other problems in the implementation of risk analysis. Trained professionals on risk analysis are few. Existing institutions that are tasked with resolving environmental and other risk issues are overburdened. Risk-related data are sorely lacking. Resources are very limited for addressing numerous natural and technological hazards. In most developing countries, political and economic stability is still threatened by both internal and external forces, hence, that is what receives priority attention. Activities like risk analysis, which generally lead to long-term results and benefits, do not get enough interest. In addition, there is still little public awareness of risks even among those who have passed the stage of survival; thus, there is little public concern about them. We cannot afford this lack of concern for long. In the Philippines, the government was the first to recognize after our peaceful revolution in 1986 that “the environmental issues can add fuel to the insurgency; they can also hamper efforts towards national recovery”.(4) To this point, I have added that risk management (including risk assessment and risk communication), like attainment of peace and freedom, is a social imperative because risk issues affect our health, safety, and both our physical and economic well-being.(7) Many of such issues in developing countries have not only local, but also global origin and impacts. They thus deserve the interest of each of us. 相似文献
85.
A method for estimating the dependence of intrinsic intervention benefits on time elapsed since the intervention took place is proposed. The method is aimed at intervention programs against diseases where one or all of the following components of hazard intensity may undergo important and unknown variations: 1) the intervention benefits to a subject are a function of the time elapsed since the intervention took place, or since inception for a continuing treatment, 2) the subjects vulnerability is an unknown function of their age, 3) the exogenous or environmental baseline intensity, to which all are assumed subjected, fluctuates arbitrarily with calendar time. During the time span of a study, these variables interact in a complex way, possibly masking the real contribution of the intervention. However, with very general assumptions about how hazard components interact, the cumulative hazards of subpopulations treated at different times in the past are shown to be described mathematically by a convolution of the time elapsed dependent intervention benefit function with the age and calendar time dependent baseline intensity. Starting from the cumulative hazards of untreated and treated subpopulations that had the intervention at different times in the past, a method of deconvolution through regularization is proposed to reconstruct the time elapsed dependence of the intervention benefit function. The regularization technique used is of the penalized least square smoothing type, it is applied to the solution of Volterra integral equations of the first kind under noisy inputs. Simulations, to test for the reconstruction of different modes of time elapsed variation of the intervention benefits, are carried out on realistically noisy data sets taken to be available at a limited number of time points. The stability of the estimated reconstructions, to measurement errors, is examined through repeated simulations with random noise added to inputs. The method is applied to a Brazilian data set where BCG vaccination resulted in a small reduction in the cumulated risk of leprosy infection. 相似文献
86.
The authors revise some of the concepts presented in their previous publications (Andolfi & Angelo, 1981; Andolfi, Nicolò-Corigliano & Menghi, 1983) and develop them further in light of their recent clinical experience. They emphasize that the therapist is not an outside neutral observer, but an active participant in the construction of the therapeutic system. The therapist can, at different times, be caring, detached, supportive, or provocative. In the fantasy of his clients he is a person who knows how to enter into a relationship and how to move out. By entering as the third pole in various triangles and activating new dimensions of rapport, he constructs complex relationships within the evolving therapeutic process. The authors also reevaluate the importance of the individual in the family as an agent of change and as a mediator of triangular relational messages. 相似文献
87.
Srikanta Chatterjee & Claudio Michelini 《Australian & New Zealand Journal of Statistics》1998,40(2):141-150
This paper uses data on expenditures and incomes of New Zealand households of different demographic profiles to construct equivalence scales. The scales are useful in estimating the relative levels of spending required by the households to attain a given level of utility. Preference consistent 'complete demand systems' are analyzed to test for the demographic effects on the consumption patterns of households. Equivalence scales for respect to specific items of consumption as well as total consumption are worked out from the observed consumption behaviour of households. The results are largely in line with those found in existing similar studies both in Australia and New Zealand. To the best of our knowledge, this is the first attempt at constructing equivalence scales with New Zealand household budget data in the framework of hypothesized utility maximizing behaviour of households. 相似文献
88.
Claudio Durastanti 《Statistical Methods and Applications》2016,25(4):651-673
The aim of this paper is to establish rates of convergence to Gaussianity for wavelet coefficients on circular Poisson random fields. This result is established by using the Stein–Malliavin techniques introduced by Peccati and Zheng (Electron J Probab 15(48):1487–1527, 2010) and the concentration properties of so-called Mexican needlets on the circle. 相似文献
89.
A classic argument in economic theory is that in a world of zero transaction costs the free bargaining among parties spontaneously leads to an efficient allocation of resources. Attempts have been made by many economists to apply such an argument to the field of politics. In contrast to market exchanges, political exchanges have been widely criticized on ethical grounds. Going beyond the well-known moral criticism regarding the exchange of votes, the paper attempts to demonstrate how in politics, ethics and economics can go hand in hand. Specifically, it proposes an unusual perspective on transaction costs, by arguing that the enhancement of such costs can be required to achieve efficient results in specific circumstances, where the free bargaining among parties conflicts with the public issue to be addressed. This suggests the basic idea that, while in markets transaction costs should be reduced, in politics, they may require to be enhanced. 相似文献
90.