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11.
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Conditional inference on 2 x 2 tables with fixed margins and unequal probabilities is based on the extended hypergeometric distribution. If the support of the distribution is large, exact calculation of the conditional mean and variance of the table entry may be computationally demanding. This paper proposes a single‐saddlepoint approximation to the mean and variance. While the approximation achieves acceptable accuracy for ordinary practical purposes, an alternative saddlepoint approximation is provided that gives much closer to exact results. It improves the accuracy of current approximations to up to more than four powers of ten. 相似文献
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This study investigates the decision-making logics used by new ventures to develop their business models. In particular, they focussed on the logics of effectuation and causation and how their dynamics shape the development of business models over time. They found that the effectual decision-making logic was used dominantly to generate a viable value proposition for a specific customer segment. Causal logic is then used dominantly to define the other business model components in relation to the value proposition and customer segment. When a shortage of resources emerges, causal logic is replaced by an increase in effectual decision-making again. They concluded that before investing significant resources in a business model it was crucial for firms to reduce, as far as possible, technological and market uncertainty through effectual strategies to avoid high re-configuration costs later. 相似文献
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This study investigates the increase in the labour force participation rate of women. We estimate a binary age–period–cohort
model for a sample of Dutch women born between 1925 and 1986. The results indicate that the increasing level of education
and the diminishing negative effect of children have played an important role. Moreover, we find important unobserved cohort
effects for pre-1955 generations, which is in line with results of studies on social norms. It is shown that the growth in
female participation is likely to slow down in the near future, as such cohort effects are not relevant for younger generations. 相似文献
17.
We analyze the impact of leniency programs on the behavior of firms participating in illegal cartel agreements in a two-stage
repeated game model. Our approach takes into account asymmetric punishment effect and allows to discuss the design of leniency
programs in the setting with asymmetries. The main contribution of the paper is that we consider heterogeneous firms. This
heterogeneity results in additional costs in case of disclosure of the cartel, which are caused by asymmetric punishments.
Next, following current antitrust rules, we analyze effects of the strictness of leniency programs, which reflects the likelihood
of getting a complete exemption from fine even in case many firms self-report simultaneously. Our main conclusion is that
leniency programs work better for small companies, since a lower rate of law enforcement is needed in order to induce self-reporting
by smaller firms, while big firms are less likely to start a cartel in the first place given the possibility of self-reporting
in future. Finally, we analyze optimal enforcement strategies of the antitrust authority and conclude that the authority with
limited resources should implement more generous leniency rules the more cartelized the economy is. 相似文献
18.
The multiple effects of carbon values on optimal rotation 总被引:2,自引:0,他引:2
Non-consumptive benefits which increase with crop age, like keeping carbon sequestered, lengthen optimal rotation compared with rotation for timber alone. High proposed carbon prices may extend rotation indefinitely. Carbon storage in wood products reduces this tendency. Biomass as an energy source displacing fossil fuels favours rotations near those of maximum biomass productivity. Use of sawn timber to displace structural materials with high embodied carbon favours somewhat longer rotations. Effects of rotation on soil carbon, and fossil carbon volatilised in harvesting operations, are further complications. Including all carbon effects results in optimal rotations somewhat longer than those based only on timber value, but shorter than those based on timber plus forest carbon. To include all factors intuitively is not possible: balanced appraisal needs economic calculations. 相似文献
19.
Ever since the introduction of Internet technology to general business, websites have played an important role in the business and promotional efforts of hotels. However, the existing tourism and hospitality literature contains only a limited number of articles that examine the perceived importance of the different attributes of a hotel website. This paper reports a study that analyzed the different perceptions of specific hotel website attributes between online purchasers and browsers and between Western and Asian users. The empirical findings reveal a set of attributes that are the most important in developing effective hotel websites. The findings also indicate the necessity of designing English- and Chinese-language hotel websites differently, based on the significant differences in the responses obtained from these two groups of online users. 相似文献
20.
This paper considers the implementation of a non-stationary, heterogeneous Markov model for the analysis of binary dependent variables in a time series of repeated cross-sectional (RCS) surveys. The model offers the opportunity to estimate entry and exit transition probabilities and to examine the effects of time-constant and time-varying covariates on the hazards. We show how maximum likelihood estimates of the parameters can be obtained by Fishers method-of-scoring and how to estimate both fixed and time-varying covariate effects. The model is exemplified with an analysis of the labor force participation decision of Dutch and West German women using ISSP (and other) data from 10 annual Dutch surveys conducted between 1987 and 1996 and 7 annual West German surveys conducted between 1988 and 1994. Some open problems concerning the application of the model are discussed. 相似文献