The evaluation of general non-centred orthant probabilities

Summary. The evaluation of the cumulative distribution function of a multivariate normal distribution is considered. The multivariate normal distribution can have any positive definite correlation matrix and any mean vector. The approach taken has two stages. In the first stage, it is shown how non-centred orthoscheme probabilities can be evaluated by using a recursive integration method. In the second stage, some ideas of Schläfli and Abrahamson are extended to show that any non-centred orthant probability can be expressed as differences between at most ( m −1)! non-centred orthoscheme probabilities. This approach allows an accurate evaluation of many multivariate normal probabilities which have important applications in statistical practice.     

Multi-platform experiment to cross a boundary between laboratory and real situational studies: experimental discussion of cross-situational consistency of driving behaviors

We constructed an innovative experimental platform to study cross-situational consistency in driving behavior, conducted behavioral experiments, and reported the data obtained in the experiment. To discuss cross-situational consistency, we separated situations in which people use some systems to conduct tasks into three independent conceptual factors: environment, context, and system. We report the experimental results with the following systems: a laboratory system with a gaming controller and steering/pedal controllers and a real system, COMS an instrumented vehicle. The results are summarized as follows. 1) The individual behaviors in each system were stable, and consistency was retained. 2) The consistency of the behaviors was also confirmed when the participants drove using different interfaces in identical systems. 3) However, only slight correlation was observed across different systems in a specific situation where a strong high-order cognitive constraint (i.e., rapid driving) and a weak low-order cognitive constraint (driving with easy handling toward a straight-line course) were given.     

TRADE IN POLARIZED AMERICA: THE BORDER EFFECT BETWEEN RED STATES AND BLUE STATES

Political and cultural polarization in the United States is widely discussed, but does it relate to any economic disconnection among states? We estimate the “border” effect between Red and Blue states using the gravity equation with a nonlinear generalized method of moments estimator to simultaneously overcome the problems associated with endogeneity, cross‐state price differences, and zero‐trade flow. The border effect is robustly confirmed for the 2000s, while not so robustly detected for the 1990s. Notably, in 2007, the border reduces trade between Red and Blue states to approximately 75% of the trade within each set of states. This estimated border effect is much smaller than the United States–Canada national border effect estimated by Anderson and van Wincoop (2003), and by Feenstra (2002), yet is comparable to the border effect that Nitsch and Wolf (2009) find for the former West and East Germanies approximately 10 years after reunification. While the border effect in Germany after reunification is decreasing, the border effect between the Red and Blue states is emerging. We also find the border effect is more significant for consumption, rather than intermediate, goods. The border effect is an important indicator for a potential dismantling of the economic connectivity in the United States. (JEL D72, F10, F15, R1)     

Race–Ethnicity and Culture in the Family and Youth Outcomes: Test of a Path Model with Korean American Youth and Parents

This study examined the interplay of parental racial–ethnic socialization and youth multidimensional cultural orientations to investigate how they indirectly and directly influence youth depressive symptoms and antisocial behaviors. Using data from the Korean American Families Project (220 youths, 272 mothers, and 164 fathers, N = 656), this study tested the relationships concurrently, longitudinally, and accounting for earlier youth outcomes. The main findings include that racial–ethnic socialization is significantly associated with mainstream and ethnic cultural orientation among youth, which in turn influences depressive symptoms (but not antisocial behaviors). More specifically, parental racial–ethnic identity and pride discourage youth mainstream orientation, whereas cultural socialization in the family, as perceived by youth, increases ethnic orientation. These findings suggest a varying impact of racial–ethnic socialization on the multidimensional cultural orientations of youth. Korean language proficiency of youth was most notably predictive of a decrease in the number of depressive symptoms concurrently, longitudinally, and after controlling for previous levels of depressive symptoms. English language proficiency was also associated with a decrease in depressive symptoms, implying a benefit of bilingualism.     

Impact of introduced honeybees, Apis mellifera , upon native bee communities in the Bonin (Ogasawara) Islands

The Bonin (Ogasawara) Islands are oceanic islands located in the northwest Pacific, and have ten native (nine endemic) bee species, all of which are nonsocial. The European honeybee (Apis mellifera), which was introduced to the islands for apiculture in the 1880s, became naturalized in a few islands shortly after introduction. To detect the impact of the honeybees upon native bee diversity, we analyzed pollen harvest by honeybees and surveyed the relative abundance of honeybees and native bees on flowers on several islands. Both hived and feral honeybee colonies were active throughout the year, harvesting pollen of both native and alien flowers and from both entomophilous and anemophilous flowers. Honeybees strongly depended on the alien plants, especially during winter to spring when native melittophilous flowers were rare. From June to November, honeybees exhaustively utilized native flowers, which had originally been utilized and pollinated by native bees. On Chichi and Haha Islands, where human disturbance of forests has been severe, both native and alien flowers were dominated by honeybees, and native bees were rare or extinct even in well-conserved forests. In contrast, on Ani Island and Haha's satellite islands where primary forests were well conserved and honeybees were still uncommon or absent, native bees remained dominant. These results suggest that competition for nectar and pollen of the native flowers between honeybees and native bees favors honeybees on the disturbed islands, which are thoroughly invaded by alien nectariferous, sometimes aggressive, weedy plants. Received: May 8, 1998 / Accepted: May 6, 1999