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111.
Anne Philippe 《统计学通讯:模拟与计算》2013,42(1):97-119
The Monte Carlo method gives some estimators to evaluate the expectation [ILM0001] based on samples from either the true density f or from some instrumental density. In this paper, we show that the Riemann estimators introduced by Philippe (1997) can be improved by using the importance sampling method. This approach produces a class of Monte Carlo estimators such that the variance is of order O(n ?2). The choice of an optimal estimator among this class is discussed. Some simulations illustrate the improvement brought by this method. Moreover, we give a criterion to assess the convergence of our optimal estimator to the integral of interest. 相似文献
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Nonparametric functional data analysis is a field whose development started some 15 years ago and there is a very extensive literature on the topic (hundreds of papers published now). The first aim of this survey is to discuss the state of art in the field through a necessarily selected, bibliographical survey. The second aim is to present a wide scope of open questions in order to promote further discussions. Our main purpose is restricted to methodological contributions and also to emphasize on kernel functional regression analysis before extending discussions in two directions: alternative techniques to kernel methods for functional regression and other statistical problems besides regression. 相似文献
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In this paper we study a class of M -estimators in a regression model under bivariate random censoring and provide a set of sufficient conditions that ensure asymptotic n1/2-convergence. The cornerstone of our approach is a new estimator of the joint distribution function of the censored lifetimes. A copula approach is used to modelize the dependence structure between the bivariate censoring times. The resulting estimators present the advantage of being easily computable. A simulation study enlighten the finite sample behavior of this technique. 相似文献
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Yanagimoto and Okamoto (1969) introduced a stochastic ordering that generalizes a concept of monotone regression dependence introduced by Lehmann (1966). In this paper, we define and examine the properties of three new orderings which imply that of Yanagimoto and Okamoto. One of these orderings is seen to extend Shaked's (1977) notion of DTP(0, 1), and another includes Lehmann's concept of positive likelihood-ratio dependence as a special case. The proposed orderings are also compared with the TP2 positive-dependence ordering defined by Kimeldorf and Sampson (1987). 相似文献
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We study and compare equilibrium platforms in models of unidimensional electoral competition with two and four policy motivated
parties. We first analyze the plurality game, where the party getting the most votes is elected and implements its proposed
platform. Restrictions on the set of credible announcements are needed to get existence of equilibria. Comparing equilibria
with two and four parties, we obtain that moderate parties react to the introduction of extreme parties by proposing the same
or more extreme equilibrium platforms. We then study the proportional system, where the policy implemented is a weighted sum
of the proposals, with the voting shares as weights. Here, the existence of extreme parties leads moderate ones to choose
more centrist platforms. We finally test the robustness of our results with respect to, first, the enlargement of the strategy
space to entry decisions and, second, to asymmetric distributions of voters' blisspoints.
相似文献
Georges Casamatta (Corresponding author)Email: |
Philippe De DonderEmail: |
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