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71.
In this paper we describe a simple model of individual voting behavior and present its implications for the candidate positioning problem under both vote and plurality maximization. Under our assumptions, some voters at the extremes of the ideological spectrum typically will not vote because they are alienated by the equilibrium location of candidates. There will also be some voters in the middle of the ideological spectrum who will not vote because they are indifferent between the equilibrium locations of the candidates. Both the abstention from alienation and from indifference arise explicitly from utility maximization. Once we allow for alienation and indifference, the two alternative candidate objective functions (vote maximization and plurality maximization) yield different outcomes. In particular, we show that under vote maximization the Median Voter (or Minimum Differentiation) outcome will not arise. On the other hand, under plurality maximization, the Median Voter outcome may or may not hold, depending on the distribution of voter preferences.We should like to thank Jerry Fusselman, Jon Hamilton, Mel Hinich, Charlie Holt and participants at seminars at the University of Virginia, Northwestern University and the 1989 Meetings of the Public Choice Society and the Economic Science Association for their helpful comments.  相似文献   
72.
Two classes of semiparametric and nonparametric mixture models are defined to represent general kinds of prior information. For these models the nonparametric maximum likelihood estimator (NPMLE) of an unknown probability distribution is derived and is shown to be consistent and relative efficient. Linear functionals are used for the estimation of parameters. Their consistency is proved, the gain of efficiency is derived and asymptotical distributions are given.  相似文献   
73.
Our objective in this paper is to examine majority voting in an environment where both public and private alternatives coexist. We construct a model in which households are differentiated by income and have the option of choosing between publicly provided services and private services. Publicly provided services are financed through income tax revenues and made available to all citizens at zero price. Majority voting determines the tax rate. Even though preferences over tax rates are not single peaked, we provide conditions under which a majority voting equilibrium exists. We illustrate our existence result with CES preferences and a Dagum income distribution. Received: 21 December 1993 / Accepted: 2 September 1996  相似文献   
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A method is proposed to construct simultaneous confidence intervals for multiple linear combinations of generalized linear model parameters, that uses a multivariate normal- or t-distribution together with the signed likelihood root statistic. In an application to a case study simultaneous confidence bands for logistic regression are calculated. A simulation study based on the example evaluation suggests superior performance compared to the common Wald-type approaches. The proposed methods are readily implemented in the R extension package mcprofile.  相似文献   
76.
This article investigates the impact of immigrant generation on students performance in college calculus courses and examines the extent to which the observed patterns corroborate or contradict various assimilation theories. It goes beyond past studies of the relationship between immigrant generation and mathematics achievement that focused primarily on middle and high school students and typically excluded foreign students. Our principal finding is that foreign students and the 1.25 generation earned the highest grades, on average, even after controlling for race/ethnicity and socioeconomic status. Our findings provide partial support for the immigrant advantage theory.  相似文献   
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German gambling operators are required to identify problem gamblers at an early stage and exclude them from gambling on their premises. The main aim of this pilot study was to investigate the compliance of staff in Bremen’s amusement arcades. While visiting 29 of 111 amusement arcades, covert gamblers simulated signs of problematic gambling behaviour, arranged self-exclusions, monitored observance of the exclusion list and made fieldnotes about the staff’s reactions. The application of age checks was also tested. The findings showed that only in six cases (5%) did the staff adequately respond to evident signs of problematic gambling behaviour. Although 18 of 29 cases (62%) eventually resulted in self-exclusions or ban-like agreements, in some instances it was necessary to overcome major obstacles that emanated from the staff’s behaviour. During 15 subsequent follow-up visits, 13 banned mystery gamblers (87%) had no problems gambling on amusement-with-prizes (AWP) machines. Finally, just 26% of the 20- to 25-year-old mystery gamblers had their ID checked. The results indicate the necessity of regular external evaluations regarding the implementation of gambling harm-minimization measures in order to identify any shortcomings. In addition, the level of staff compliance may be increased by amending current legislation (e.g. by introducing a nationwide self-exclusion programme).  相似文献   
80.
The risk of unemployment in Latin America is high. Unemployment insurance exists only in a few countries; coverage is small, and virtually non-existent in the informal economy. For this reason social protection policies for unemployed workers, defined in the broad sense, have addressed and strengthened the role of direct employment programmes and assistance through cash subsidies. This article describes the main features (financing and administration) of direct employment programmes in the region and their objectives, and evaluates their functioning in terms of targets and coverage, costs and impact. Available studies show that the net direct impact of such programmes on unemployment rates and on beneficiaries' incomes is in most cases relatively low. Nevertheless, in some cases they have helped to lower levels of unemployment and poverty, and have indirect positive effects that are more difficult to measure, such as incentives to economic recovery resulting from the chain effect on consumption of beneficiaries buying goods. For this reason direct employment programmes remain a fully valid mechanism, especially in social emergencies.  相似文献   
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