A saddlepoint approximation to the distribution of the sum of independent non‐identically uniform random variables

Calculating the probability of the corresponding significance point is important for finite sample sizes. However, it is difficult to evaluate this probability when the sample sizes are moderate to large. Under these circumstances, consideration of a more accurate approximation for the distribution function is extremely important. Herein, we performed a saddlepoint approximation in the upper tails for the distribution of the sum of independent non‐identically uniform random variables under finite sample sizes. Saddlepoint approximation results were compared with those for a normal approximation. Additionally, the order of errors of the saddlepoint approximation was derived. © 2014 The Authors. Statistica Neerlandica © 2014 VVS.     

The role of schedule delays on passengers’ choice of access modes: A case study of Japan’s international hub airports

We empirically study passenger modal-choice behavior to access an international hub airport, by using stated preference (SP) data and by constructing a binomial logit model. We found that passenger modal choice is affected by the service level of the access modes: travel time, travel cost, waiting time, and delay cost. The results also indicate that if passengers choose access mode in advance they consider service frequency: departure timing from home, and the arrival timing at the airport. Moreover, our results indicate that travelers’ willingness to pay for saving time differs by time of a day. They are apt to pay more in the morning than in the afternoon. These outcomes must contribute to improve the access flight service from local to hub airports to handle the needs of passengers.     

Development and application of a new methodology of evaluating industrial R&D projects

This paper proposes a new methodology of evaluating industrial R&D projects to assess the effectiveness of future R&D in terms of financial credibility, to prioritize them efficiently by clear criteria to reduce the time and burden consumed by both project leaders and management staffs. A new methodology has been developed and applied to all Sumitomo Electric Industries (SEI) R&D projects, and is recognized as a useful system for evaluating many R&D projects in a short period, such as 150 projects per month.     

Social Network Rebuilder: A Tool to Estimate a Social Network of Financial Crisis Propagation

The objective of this paper is to find a new method to estimate real social networks based on observed data collected by questionnaire surveys. Studies on social networks have been increasing in order to analyze social phenomena from a micro viewpoint. Most social phenomena can be explained by micro-level interactions among people. Spread of rumor and pandemics are typical example of micro interaction? However, there has not been much work on an analysis of real social networks based on observed data. This study tries to establish a methodology that exploits a genetic algorithm to rebuild a social network based on the data observed indirectly from real social networks. This paper introduces our proposed method, which allows us to rebuild a social network to some extent from degree distributions of a target real social network.     

EMPIRICAL ANALYSIS OF INTER‐FIRM RIVALRY BETWEEN JAPANESE FULL‐SERVICE AND LOW‐COST CARRIERS

This paper empirically analyzes dynamic change in inter‐firm rivalry between Japanese low‐cost carriers (LCC) and full‐service carriers, and deduces the dynamic change in consumer surplus after an LCC enters a market. Our findings are that: (i) the conduct parameters of LCC and reacting full‐service carriers were extraordinarily low when competition started; (ii) the conduct parameters were restored to, or even exceeded, the pre‐entry level in the third year of LCC entry; and (iii) gains in total welfare were recognized for five of the nine markets, whereas in three markets only the airline industry benefited, and in one market, total welfare decreased.     

Peliosis of the spleen with intraperitoneal hemorrhage

We encountered a patient with steroidrelated peliosis of the spleen, a rare disease characterized by multiple blood-filled cavities in the splenic parenchyma, with spontaneous intraperitoneal hemorrhage. The ultrasonographic, computed tomographic, and angiographic images were compared with pathologic findings of the material obtained surgically.     

Recalculating the agricultural labor force in China

In this study, we use a hypothetical method to recalculate the agricultural labor force based on statistical data on the labor force in China. We confirm the revised agricultural labor force data by estimating the agricultural production function. Through comparing the marginal labor productivity with the subsistence level of wages in the agricultural sector, we find that the overstated figures of agricultural labor force not only result in the underestimation of agricultural labor productivity but also are misleading by indicating that China reaches the Lewis turning point later than in actuality. The process of labor transfer in China, a large part of which is through rural migrant workers, has been much faster than expected.     

RESOURCE ALLOCATION AND EFFICIENCY OF SHARECROPPING UNDER UNCERTAINTY*

The paper examines how efficiency of sharecropping under uncertainty can be tested empirically. It demonstrates even under uncertainty, equality of factor ratios between sharecropped land and owner-cultivated land supports the hypothesis that the terms of share contracts are effectively enforced by landlords, so as to achieve socially optimum resource allocation and risk sharing, unless the direct elasticities of substitution are identically equal to one. It also provides evidence, that the comparative yield tests conducted in different parts of South and Southeast Asia support the efficiency view of sharecropping.     

The impacts of China on economic growth: Evidence for Brazil,Chile, and Peru

This study empirically analyzes the direct impacts derived from the swift increase in exports to China (referred to as “the impact of China”) on the economic growth of three selected South American countries, Brazil, Chile, and Peru, during the commodity boom between 2001 and 2008. The results stemming from the balance-of-payments-constrained growth model suggest that the magnitude of China’s impact was less than 1 percent, although it ranged from the largest to the second largest impact among all trading partners for the three countries. The estimated balance-of-payments growth rate of domestic income is lower than the real growth rate of domestic income. This is because the growth rates of the export volumes were not sufficient even during the commodity boom, on account of the continued increasing trends of income elasticity of demand for imports. Furthermore, the income elasticities of demand for imports from China were especially high. Therefore, the three countries will continue to face further increase in the income elasticity of demand for imports as well as a stagnant growth rate of export volumes. Thus, the balance-of-payments position will continue to be the main growth constraint for these countries.     

‘Inpatriation’ for knowledge-transfer within Japanese multinational corporations

This article uses knowledge management theory and the gravity model to analyse the determinants of ‘inpatriation’ for knowledge-transfer within multinational corporations (MNCs) and the differences in their effects based on the region of the subsidiary’s host country. The empirical analysis uses data collected through a survey of the overseas subsidiaries of Japanese MNCs and finds that factors related to both the countries and the individual MNCs affect inpatriation, with the former factors having a stronger influence than the latter. With regard to the country factors, a smaller geographic distance and a larger cultural distance between the home and host countries and a lower GDP per capita in the subsidiary’s host country increase inpatriation. Regarding the individual MNC factors, a larger subsidiary R&D budget, a larger parent firm and the execution of collaborative R&D projects between a subsidiary and its parent firm increase inpatriation. Additionally, this study finds that in Asia, geographic closeness and low GDP per capita facilitate inpatriation, whereas a relatively small R&D budget and rare collaborative R&D projects with Japan decrease inpatriation. More subsidiaries in Asia send inpatriates to Japan than do subsidiaries in other regions because these positive factors are much stronger than these negative factors.