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Harry Joe 《Revue canadienne de statistique》1990,18(3):233-244
In lotto games, the distribution of k-tuples chosen by participants is not uniform, but the chance of any k-tuple being the winner is the same. The winning categories consist of matching exactly k — i numbers from the winning k-tuple for i = 0, 1, …, m for some m. The total prize pool for a category is divided equally among all the winning tickets in the category. Therefore the strategy of buying a ticket with a k-tuple consisting of unpopular numbers will increase the expected amount of the prize if this k-tuple is a winner in some category, because the prize pool is shared among fewer tickets. By modelling the distribution of 6-tuples chosen by participants of Lotto 6/49 in Canada, the expected return and standard deviation of return can be computed. It is shown that the expected return can be more than the amount spent when the carryover is large, but the large standard deviation means that it would take tens of thousands of years to millions of years for the strategy to have a high probability of yielding a profit. 相似文献
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Both earlier and current analytical perspectives on appropriate modes of delivering retirement provision have tended to underestimate both the inherent adaptability and the developmental potentialities of the national provident fund (NPF) model. The essence of this model is found in the welfare salience of the possibility of synergy between the NPF's direct (retirement provision) and indirect (development finance institution) roles in developing political economies. Diffusion is found to be important in the development of the NPF model from Asian origins and in its subsequent retention in a limited number of states. NPF "success stories" are few in number but potentially significant given their regional concentration and impact, the latter currently underlined by further expansion and development of existing NPFs and by recently renewed prospects for regional diffusion of the model. Further examination of the significantly enhanced welfare outcomes achieved through the creative utilization of existing NPFs underlines the potentiality for NPF-led development within "pillarized" retirement provision. 相似文献
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We propose semiparametric procedures for estimation and testing of base-independent equivalence scales. The partial linear index specification permits simultaneous estimation across multiple household types and multiple goods and also the incorporation of continuous and discrete household attributes. Furthermore, asymptotic properties of estimated equivalence scales and tests of base independence are readily obtained. The efficiency gains from the proposed models and estimators are particularly helpful for developing country data where there is often much greater variation in household size and composition. We apply the techniques to South African data and find the results to be broadly consistent with base independence. 相似文献