Management und Marketing ferngesteuerter Dienstleistungen: Konzeptionelle Verortung, betriebswirtschaftliche Herausforderungen und k??nftige Forschungsaufgaben

The possibilities of service delivery have expanded vastly over the last years, mainly due to the rapid development of information and communication technologies. Modern forms of data transmission enable a technologically mediated delivery of a broad spectrum of services over great distances. These ??remote services?? gain more and more importance in business, yet have only attracted little attention in academic research so far. This overview article captures the state-of-the-art of research in this field and starts laying the groundwork for a thorough discussion of economically relevant aspects of remote services. Based on a definition and conceptualization of this new service type that considers current service typology, this article identifies specific challenges for management and marketing of remote services and deduces an agenda for future research.     

Jakarta: Environmental problems and sustainability

Jakarta is on the way to become a “world city”, but to classify in this regard, it needs to be more than the size of the metropolis but it should be enlightened management, the kind of services the city offers to ensure a balanced economic, social, political and environmental development; thus, criteria which would indicate its social, economic and environmental “sustainability” and quality of life. The recent years have shown Jakarta's current management to evolve as promoter of centennial projects like the modernization of the center, the establishment of an integrated public transport system, the redevelopment of the waterfront and a new harbor, the conservation of the Old City, and creation of a few gentrified public parks. While these grand projects are still in the making, many infrastructure and environmental problems still continue to prevail, and there is substantial concern about the pro-rich and anti-poor policies which are being pursued, while Jakarta pretends to make the quantum jump to a modern city.     

Realisierung von Cross-Selling Potenzialen durch das Management von kundeninitiierten Kontakten

Existing research has not sufficiently addressed the question of how to cross-sell additional products and services to customers and what the behavioral consequences of cross-selling are. Moreover, these cross-selling-related questions have not been investigated in the context of customer-initiated contacts.The contribution of the paper is the empirical analysis of metrics which can be used to predict cross-selling success, e.g., in a call-center. The results show that two metrics, namely first contact resolution and reason for contact, significantly predict cross-selling success. Another contribution is the analysis of behavioral consequences. Here the results show that usage intensity significantly increases the time directly after the cross-selling took place but relapses to the original level within a few weeks.The results of the study can be used to derive managerial implications for managing and controlling cross-selling initiatives and for increasing and stabilizing cash-flows.     

Testing for intercept‐scale switch in linear autoregression

Autoregressive models with switching regime are a frequently used class of nonlinear time series models, which are popular in finance, engineering, and other fields. We consider linear switching autoregressions in which the intercept and variance possibly switch simultaneously, while the autoregressive parameters are structural and hence the same in all states, and we propose quasi‐likelihood‐based tests for a regime switch in this class of models. Our motivation is from financial time series, where one expects states with high volatility and low mean together with states with low volatility and higher mean. We investigate the performance of our tests in a simulation study, and give an application to a series of IBM monthly stock returns. The Canadian Journal of Statistics 40: 427–446; 2012 © 2012 Statistical Society of Canada     

多层Logit结构多模式变量需求网络平衡模型

探讨了多类别多模式变量需求网络平衡模型,模式选择模型采用多层ｌｏｇｉｔ结构,终点选择特定为一个多比例熵出行分配模型,公交车辆的出行时间与同一路网的其他车辆另行时间密切相关,采用变分不等式方法将模型的全部组元集合于一个模型中,并运用基于ＢｌｏｃｋＧａｕｓｓ－Ｓｅｉｄｅｌ分解算法有效地解决了固定需求和多维出行分布网络平衡模型的计算,论文给出了根据智利圣地亚哥市数据由ＥＭＭＥ／２软件包所得到的数值结果。     

Adaptive graph‐based multiple testing procedures

Multiple testing procedures defined by directed, weighted graphs have recently been proposed as an intuitive visual tool for constructing multiple testing strategies that reflect the often complex contextual relations between hypotheses in clinical trials. Many well‐known sequentially rejective tests, such as (parallel) gatekeeping tests or hierarchical testing procedures are special cases of the graph based tests. We generalize these graph‐based multiple testing procedures to adaptive trial designs with an interim analysis. These designs permit mid‐trial design modifications based on unblinded interim data as well as external information, while providing strong family wise error rate control. To maintain the familywise error rate, it is not required to prespecify the adaption rule in detail. Because the adaptive test does not require knowledge of the multivariate distribution of test statistics, it is applicable in a wide range of scenarios including trials with multiple treatment comparisons, endpoints or subgroups, or combinations thereof. Examples of adaptations are dropping of treatment arms, selection of subpopulations, and sample size reassessment. If, in the interim analysis, it is decided to continue the trial as planned, the adaptive test reduces to the originally planned multiple testing procedure. Only if adaptations are actually implemented, an adjusted test needs to be applied. The procedure is illustrated with a case study and its operating characteristics are investigated by simulations. Copyright © 2014 John Wiley & Sons, Ltd.     

The transition to tertiary education and parental background over time

We analyze the role of parental background for transitions to tertiary education in Germany and answer three questions: (a) does the relevance of parental background shift from short-term (contemporary income) to long factors (ability, parental education) at higher levels of education? (b) Did the impact of parental background on participation in tertiary education change over time? (c) Are there different patterns by sex and region? Parental income significantly affects transitions to tertiary education. Its impact seems to have lost magnitude over time. We find no clear differences by sex and larger parental income effects in West than in East Germany.     

Informed sub-sampling MCMC: approximate Bayesian inference for large datasets

Statistics and Computing - This paper introduces a framework for speeding up Bayesian inference conducted in presence of large datasets. We design a Markov chain whose transition kernel uses an...