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1.
Yosihiko Ogata Koichi Katsura Masaharu Tanemura 《Journal of the Royal Statistical Society. Series C, Applied statistics》2003,52(4):499-509
Summary. Earthquake intensities are modelled as a function of previous activity whose specific form is based on established empirical laws in seismology, but whose parameter values can vary from place to place. This model is used for characterizing regional features of seismic activities in and around Japan, and also for exploring regions where the actual seismicity rate systematically deviates from that of the modelled rate. 相似文献
2.
Working mothers and sons’ preferences regarding female labor supply: direct evidence from stated preferences 总被引:2,自引:2,他引:0
We investigate the argument that men who are raised by working mothers develop a preference that is favorable toward working
women and, consequently, are more likely to have working wives. We test this hypothesis using the Japanese General Social
Surveys 2000–2003. We directly examine the responses to the opinion survey’s questions regarding appropriate gender roles.
The estimation results indicate that men raised by full-time working mothers are less likely to support traditional gender
roles. Those men are also less likely to believe in the negative impact of a mother’s working on her children’s development.
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In sequencing problems for mixed-model assembly line in JIT production system, the Goal Chasing method (GC) is widely used for parts used leveling goal. The difference in assembly time of each product is not taken into consideration in the Goal Chasing method. Assembly time usually varies with product types. In recent years, the Time-Based Goal Chasing method (TBGC) has been proposed. The advantage of TBGC is to consider the influence of different assembly time of each product and idle time in production period. TBGC, however, has been only applied to single work station problems. In this paper, TBGC is applied to an assembly line problem with multiple work stations. Furthermore, the sequencing method and use of Simulated Annealing (SA) or Local Search (LS) for this problem are proposed. 相似文献
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Assuming a statistical model in which the joint distribution of the unobservable errors is drawn from independent univariate Student t's that are identically and symmetrically distributed, the sampling performance of traditional robust estimators and a family of Stein-like estimators are compared and evaluated. These results suggest that under thick-tailed distributions, the relative sampling performances and risk characteristics for a range of nonconventional Stein estimators remains approximately the same as in the case of their normal counterparts. The empirical risk implications of misspecifying the error distribution are investigated. 相似文献
6.
In the analysis of variance, we often encounter situations in which we want to test the null hypothesis of homogeneity of the normal means against various partially ordered alternative hypotheses. We study likelihood ratio tests for three useful types of alternatives: d-star, bipartite and broom tree. Especially, we give computational formulas for the level probabilities of the alternative types. The results permit us to obtain critical values for practical use. 相似文献
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Summary We performed multiple-generation competition experiments betweenCallosobruchus analis andC. phaseoli with different bean sizes. In each system, we supplied 5 g of mung beans (Vigna radiata) every 10 days. We examined three types of bean conditions: 5 g of large beans, 5 g of small beans, and a mixture of 2.5
g of large and small beans. In small bean condition,C. analis dominatedC. phaseoli in all three replicates andC. phaseoli was extinct by the 260th day. On the contrary,C. phaseoli overcameC. analis within 250 days in large beans in all three replicates. In mixed beans condition the two bruchid species coexisted more than
500 days in two out of the three replicates. Even in the exceptional case, both species coexisted for 460 days. These results
were examined in the light of the predictions from short-term larval competition experiments and a game theoretical model
by Smith and Lessells (1985). The density and frequency dependent results during larval competition inside a bean was concluded
to be a main factor to produce the above long-term competition results. 相似文献
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Marc Fleurbaey Koichi Tadenuma 《Econometrica : journal of the Econometric Society》2007,75(4):1143-1174
We study how to evaluate allocations independently of individual preferences over unavailable commodities. We prove impossibility results that suggest that such evaluations encounter serious difficulties. This is related to the well known problem of performing international comparisons of standard of living across countries with different consumption goods. We show how possibility results can be retrieved with restrictions on the domain of preferences, on the application of the independence axiom, or on the set of allocations to be ranked. Such restrictions appear more plausible when the objects of evaluation are allocations of composite commodities, characteristics, or human functionings rather than ordinary commodities. 相似文献
10.
Summary Simulation model for niche shift in ecological time scale was constructed on the basis of the optimal foraging theory. In
accordance with the previous experimental study (Shimada andFujii, 1985), the model competitive system consisted of 2 parasitoid wasp species utilizing 4 host stages. Wasps were assumed to
choose host stages in the manner that they realized the maximal gain/cost values, where gain was represented by body weight
of a wasp progeny emerging from each host stage and cost was expressed by time required to search for and detect an unparasitized
host. The number of parasitized hosts in each host stage was calculated numerically by usingArditt's (1983) model for avoidance of superparasitism.
The model simulated well the experimental results ofShimada andFujii (1985) andShimada (1985). Sensitivity analysis of the model showed that the experimentally derived criterion for competitive coexistence (different
second-best host stages between competing species even with the common best) was not necessarily the indispensable condition
for niche shift and separation, but that if the criterion was not satisfied, stable competitive coexistence occurred only
in the narrow range of the parametric values. Further, niche shift in ecological time scale made the competitive coexistence
more stable than fixed niche on which the current niche theory stands. 相似文献