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Göran Kauermann Christian Schellhase David Ruppert 《Scandinavian Journal of Statistics》2013,40(4):685-705
The paper introduces a new method for flexible spline fitting for copula density estimation. Spline coefficients are penalized to achieve a smooth fit. To weaken the curse of dimensionality, instead of a full tensor spline basis, a reduced tensor product based on so called sparse grids (Notes Numer. Fluid Mech. Multidiscip. Des., 31, 1991, 241‐251) is used. To achieve uniform margins of the copula density, linear constraints are placed on the spline coefficients, and quadratic programming is used to fit the model. Simulations and practical examples accompany the presentation. 相似文献
65.
This paper studies the implementation of the coupling from the past (CFTP) method of Propp and Wilson (1996) in the set-up of two and three component mixtures with known components and unknown weights. We show that monotonicity structures can be exhibited in both cases, but that CFTP can still be costly for three component mixtures. We conclude with a simulation experiment exhibiting an almost perfect sampling scheme where we only consider a subset of the exhaustive set of starting values. 相似文献
66.
PD Dr. Christian Lüdemann 《KZfSS K?lner Zeitschrift für Soziologie und Sozialpsychologie》2001,53(3):547-568
In this study the attitude towards the new nationality law in Germany is explained by a value/expectancy theory of attitude. 215 standardized face-to-face-interviews were performed with a quota sample. The results of this survey show that the value and expectancy theory of attitude is extremely successful in explaining the attitude towards the new nationality law. Models explaining the predictor variable of the attitude theory and a feedback-model were tested. 相似文献
67.
Dr. Gerald Eisenkopf Prof. Dr. Christian Lukas 《Zeitschrift für Betriebswirtschaft》2010,80(7-8):821-839
The paper analyzes different selection policies in education and business. We show that incorrect self-perceptions combined with imperfect performance measurement may cause significant welfare losses in selective educational systems, in particular if selection starts too early. Of course, these welfare losses can be mitigated by an investment in better ability assessment. However, an affirmative action policy could serve the same purpose as such an investment. We apply our analysis also to diversity management in firms. Based on positive discrimination we establish an efficiency argument for diversity management. 相似文献
68.
This paper presents a review of empirical research on the impact of acquisitions on firm performance. The evidence suggests that, in the short run, acquisitions have at best an insignificant impact on shareholder wealth. Long‐run performance analysis reveals overwhelmingly negative returns, while the evidence using accounting performance measures is mixed. The review also examines the impact of bid characteristics on performance. The acquisition of hostile targets, transactions that are paid for with cash and acquisitions of larger targets are associated with superior (or at least less negative) performance, while there is mixed evidence on the benefits of related acquisitions. A number of recent studies find that acquirers with superior pre‐bid performance tend to experience significant underperformance in the post‐bid period. 相似文献
69.
Time series of counts occur in many fields of practice, with the Poisson distribution as a popular choice for the marginal process distribution. A great variety of serial dependence structures of stationary count processes can be modelled by the INARMA family. In this article, we propose a new approach to the INMA(q) family in general, including previously known results as special cases. In the particular case of Poisson marginals, we will derive new results concerning regression properties and the serial dependence structure of INAR(1) and INMA(q) models. Finally, we present explicit expressions for the distribution of jumps in such processes. 相似文献
70.
Judgment aggregation without full rationality 总被引:1,自引:1,他引:0
Several recent results on the aggregation of judgments over logically connected propositions show that, under certain conditions,
dictatorships are the only propositionwise aggregation functions generating fully rational (i.e., complete and consistent)
collective judgments. A frequently mentioned route to avoid dictatorships is to allow incomplete collective judgments. We
show that this route does not lead very far: we obtain oligarchies rather than dictatorships if instead of full rationality
we merely require that collective judgments be deductively closed, arguably a minimal condition of rationality, compatible
even with empty judgment sets. We derive several characterizations of oligarchies and provide illustrative applications to
Arrowian preference aggregation and Kasher and Rubinstein’s group identification problem.
This paper was circulated in August 2006 and presented at the Yale workshop on Aggregation of Opinions, September 2006, at
the Centre interuniversitaire de rechere en économie quantitative, Montreal, October 2006, and at the 1st International Workshop
on Computational Social Choice, Amsterdam, December 2006. We are grateful to the participants at these occasions and the anonymous
referees for comments. We also thank Ton Storcken for discussion. Elad Dokow and Ron Holzman have independently proved closely
related results, which were also presented at the Yale workshop in September 2006, and circulated in the December 2006 paper
(Dokow and Holzman 2006). 相似文献