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排序方式： 共有966条查询结果，搜索用时 15 毫秒
31.
François-Éric Racicot 《Applied economics》2013,45(10):981-989
Econometricians have long recognized the need to account in some way for measurement errors, specification errors and endogeneity to ensure that the ordinary least squares estimator is consistent. This article introduces a new generalized method of moments estimator that relies on robust instruments to estimate panel data regression models containing errors in variables. We show how this GMM approach can be generalized for the panel data framework using higher moments and cumulants as instruments. The new instruments, engineered for greater robustness, are proposed to tackle the pervasive problem of weak instruments. 相似文献
32.
In this paper the authors introduce a novel approach to stochastic image processing, denoted as Differential Markov Random Field (DMRF), which has been applied to gravity anomaly separation problems. The advantages of the method are that it introduces only little distortion into the shape of the original image and that it is not affected significantly by factors such as the overlap power spectra of regional and residual fields. Testing of the proposed meth using synthetic examples gave excellent results. 相似文献
33.
In past years, beekeeping as an agricultural sector has become more organized, but there is still a gap in knowledge in considering consumer preferences for honey. The aim of the research was to determine consumer preferences for honey and their attitudes towards the Protected Designation of Origin (PDO) label. Also, in the article is presented the current situation regarding the honey market and legislation of the PDO label at the EU and national levels. The result of the empirical research carried out on a sample of 1008 respondents showed that they mostly prefer a mild flavour and brighter colour of honey. According to the type, most of the respondents prefer acacia rather than floral and meadow honeys or other types of honey. The most common method of honey purchase is directly from the producers (75%). The results of the Principle Component Analysis (PCA) showed that the most important attributes are the intrinsic attributes of the honey and that the most common reasons for purchasing and consuming honey are for its health and medical benefits. The obtained results fill the gap in knowledge regarding consumer preferences for honey in the Croatian market and can be useful for the creation of new honey-marketing strategies for local beekeepers. 相似文献
34.
Peter Trkman Andrej Kovačič Aleš Popovič 《Business & Information Systems Engineering》2011,3(4):211-220
The paper argues that attitudes to SOA follow a typical hype cycle from Technological Trigger, Peak of Inflated Expectations, and a Trough of Disillusionment to the more recent realization that SOA is a concept that may offer certain benefits but has several limitations. The main research question studies how the attitude to SOA changes in various phases of the hype cycle, how the SOA implementation cycle and an increase in business process maturity (BPMa) are interconnected and which factors influence the transition between the hype cycle phases. The paper shows that an organization’s success with implementing SOA depends on its ability to match the SOA implementation with an increase in BPMa. The dual purpose of implementing SOA is shown in the first framework: to assure the coherence of IT assets and to assure business/IT alignment. In the second framework, the interconnection of SOA and BPMa and its role in transiting through the hype cycle phases is outlined. The findings are analyzed using a longitudinal case study of a large Slovenian company. 相似文献
35.
In this case study, a real world problem of a production firm in the Marmara Region, Turkey was considered. In the current situation, the firm works with different third-party logistics firms and uses different ports each time. However, they have some quality problems and decided to work with a logistics firm by using the most convenient port alternative. A number of conflicting qualitative and quantitative criteria exist for evaluating alternative ports. Qualitative criteria are often accompanied by ambiguities and vagueness. To cope with this problem, the fuzzy analytic network process (FANP) method is used in this study. First, we defined the region specific criteria consisting of the twenty sub-criteria under the six main criteria clusters that influence the selection of container port. Then seven alternative container ports located in the Marmara Sea were determined. The results showed that the most convenient district for the container port is Istanbul District, which is one of the biggest economical centers in Eastern Europe. 相似文献
36.
Abstract In scholarly discussions, marketing tends to be imagined and (re)presented as a practice of organisations, involving a set of activities, whereby consumer desires are discovered and provided for through two-way communication. By studying the creation and diffusion of fashion, we observe that marketing is not simply a mechanism or set of activities but an institution of modern society that involves all social elements together with consumers and marketing organisations. Through a qualitative inquiry with both consumers and producers, we illustrate how these different elements exercise their roles and responsibilities for marketing to work as an institution. By this illustration, we also provide a perspective on how trickle-up, trickle-across, and trickle-down diffusions are simultaneously operative in fashion. Finally, we articulate the implications of recognising marketing as an institution that will help marketing scholars and practitioners in reorganising and re-strategising their purpose and role in society as modernity evolves. 相似文献
37.
This article examines the process of informalization of work in platform food delivery work in the UK. Drawing on qualitative data, this article provides new analytical insight into what drives individual formal couriers to both supply and demand informalized sub-contracted gig work to undocumented migrants, and how a platform company enables informal work practices through permissive HR practices and technology. In doing so, this article shows how platform companies are enablers of informal labor markets and contribute to the expansion of hyper-precarious working conditions. 相似文献
38.
The purpose of the current study was to investigate the awareness and knowledge status of physical education candidate students about physical education lessons designed for disabled individuals. A qualitative data collection technique was used in order to present the knowledge and awareness status of candidate students. Research conducted during the 2017–2018 fall semester with 30 4th grade students. By using the interview technique students questioned if physical education for disabled course composed awareness and increased their knowledge about disabled with three questions. The Data obtained accordingly were summed up and annotated according the pre-determined themes. Moreover, qualitative data were prepared by using the frequency and breakdown tables to form the numerical findings. The results revealed that the physical education candidates did not have knowledge about the physical education lessons designed for disabled individuals before taking the course and awareness status also found low (53.34%). However they stated that the physical education for disabled course changed their knowledge and awareness status (60%).
相似文献39.
40.
The paper examines the cost efficiency of the Czech-banking system in the 1990s by applying the distribution free approach
model. Reported results indicate that foreign banks were on average more efficient than the other banks, although their efficiency
was comparable with the ‘good’ small banks’ efficiency in early years of their operation. Based on the estimated results it
is argued that early privatisation of state-owned commercial banks and more liberal policy towards foreign banks in the early
stage of transition would have enhanced the efficiency in the banking system.
Anita Taci - The views and opinions are those of the author and not necessarily those of the EBRD. 相似文献