A conjugate prior for discrete hierarchical log-linear models

In Bayesian analysis of multi-way contingency tables, the selection of a prior distribution for either the log-linear parameters or the cell probabilities parameters is a major challenge. In this paper, we define a flexible family of conjugate priors for the wide class of discrete hierarchical log-linear models, which includes the class of graphical models. These priors are defined as the Diaconis--Ylvisaker conjugate priors on the log-linear parameters subject to "baseline constraints" under multinomial sampling. We also derive the induced prior on the cell probabilities and show that the induced prior is a generalization of the hyper Dirichlet prior. We show that this prior has several desirable properties and illustrate its usefulness by identifying the most probable decomposable, graphical and hierarchical log-linear models for a six-way contingency table.Comment: Published in at http://dx.doi.org/10.1214/08-AOS669 the Annals of Statistics (http://www.imstat.org/aos/) by the Institute of Mathematical Statistics (http://www.imstat.org

Impact of Information Technology Capability on Financial Performance of Chinese Listed Companies during the Period of Economic Downturn

The information technology (IT) resource-based view suggests that IT capability is one of the determinants of a firm’s competitive advantage and financial performance. However, we know relatively little about the relationship between IT capability and financial performance during the period of economic downturn. Even fewer research related to this is done in China as the largest emerging We used the matched sample comparison group method to collect data from 248 listed companies before and after the 2008 financial crisis during 2007-2009, and to investigate the impacts of IT capability on financial performance during economic downturn. The findings show that even during the period of financial crisis, companies with superior IT capability have better average profit ratios than a control sample of companies, but differences in the cost ratio of suggest no statistical significance between two samples

Análisis del fútbol español como producto turístico y elaboración de un plan de turismo futbolístico para el mercado chino

The objective of this research work is to develop a tourism plan focused on the Spanish soccer as a main tourist attraction directed exclusively to the Chinese market. For this purpose, an exhaustive compilation and analysis of information will allow first to determine the initial situation of Spanish and Chinese football, and identify the cities of Barcelona, Madrid and Valencia as potential tourist attractions. The infrastructure and the number of points of interest offered by each of the destinations and their ability to generate football tourism will be explained. Afterwards, a profile of the Chinese tourist interested in football will be established to subsequently carry out a travel plan with different routes that may adapt to the needs of the clients¿ profiles. Finally, a series of recommendations about infrastructure, media, and marketing will be made to achieve an optimal adaptation to the target market.El objetivo del presente trabajo de investigación es desarrollar un plan de turismo enfocado en el fútbol español como principal atractivo turístico dirigido exclusivamente al mercado chino. Para este fin, se realizará una exhaustiva recopilación y análisis de información que permitirán en primer lugar determinar la situación inicial del futbol español y chino, e identificar a las ciudades de Barcelona, Madrid y Valencia como potenciales atractivos turísticos futboleros. Se determinarán la infraestructura y el número de puntos de interés que ofrece cada uno de los destinos y su capacidad de generar turismo futbolístico. Seguidamente, se establecerá un perfil del tipo de turista chino interesado en el fútbol, para posteriormente realizar un plan de viaje con distintas rutas que se adaptaran a las necesidades de los perfiles demandantes. Por último, se realizará una serie de recomendaciones en infraestructura, medios de comunicación, y marketing para lograr una óptima adaptación al mercado apuntado.Liu, J. (2017). Análisis del fútbol español como producto turístico y elaboración de un plan de turismo futbolístico para el mercado chino. Universitat Politècnica de València. http://hdl.handle.net/10251/86741TFG

Website Service Quality and Shopping Website Stickiness: The Mediating Effect of Website Involvement

Website service quality has been considered to be important to increase users’ stickiness toward website in online shopping context. However, the underlying mechanism through which website service quality can influence shopping website stickiness remains unclear. In this study, the concept of website involvement was introduced to explain why people tend to favor sticking a shopping website. Also, four dimensions of website service quality (i.e. recovery , reliability, personalization, and responsiveness) were identified from existing related literature to influence consumers’ website involvement. Unlike prior studies, the “Stimulus-Organism- Response” model and an integrated framework combining the transactional view and the relational view of consumer-website interaction were used to test the relationship among website service quality , website involvement (cognitive involvement and affective involvement), and website stickiness. Empirical result shows that website service quality has no significant direct impact on website stickiness. However, it has significantly positive effects on both cognitive involvement and affective involvement, which in turn significantly correlate to website stickiness, indicating that website involvement plays full mediating role in the relation between website service quality and website stickiness. The results also indicate that consumer affective involvement strongly influences their cognitive involvement toward a shopping website

Mobile O2O Commerce Platform Quality: Scale Development and Validation

The Drainage effect of mobile O2O commerce is closely related to the platform quality. However, to date there has been no measure specifically designed to measure mobile O2O commerce platform quality (MCPQ). The purpose of this study is to develop a scale for measuring MCPQ based on the IS success model. Exploratory factor analysis (study 1) and confirmatory factor analysis (study 2) were performed on 613 samples. Results showed that the scale of MCPQ is a reliable and valid instrument, and that mobile O2O commerce platform quality is a multi-dimensional construct composed of five dimensions, i.e., interface design, operational efficiency, content quality, demand responsiveness, and privacy protection

Effect of Online Product Presentation on the Purchase Intention of Wearable Devices: The Role of Mental Imagery and Individualism–Collectivism

© Copyright © 2020 Wu, Wang, Liu and Shin. The main objective of this study was to investigate how and when online product presentation influences individual purchase intention of wearable devices in China. This study hypothesized that online product presentation would influence individual mental imagery, which, in turn, would impact purchase intention through perceived social risk and positive emotion, but this effect would be moderated by individualism–collectivism value at the individual level. We performed a laboratory experiment (2 × 2) to collect the data (N = 254). The experimental results indicated that there was a significant interaction effect between the product feature presentation video and usage scenario presentation picture on mental imagery. In addition to a direct effect, mental imagery had an indirect effect on purchase intention through perceived social risk and positive emotion. Additionally, the behavioral effect of perceived social risk was moderated by individualism–collectivism. Specifically, compared with individualists, perceived social risk had a stronger impact on collectivists’ purchase intention. This study contributes to a greater understanding of the mechanism through which online product presentation drives purchase intention, with a particular emphasis on how individualism–collectivism value at the individual level moderates consumers’ intention to purchase wearable devices

Linking Safety-Specific Leader Reward and Punishment Omission to Safety Compliance Behavior: The Role of Distributive Justice and Role Ambiguity

Background: Although positive safety leadership has attracted increasingly academic and practical attention due to its critical effects on followers' safety compliance behavior, far fewer steps have been taken to study the safety impact of laissez-faire leadership. Objective: This study examines the relationships between safety-specific leader reward and punishment omission (laissez-faire leadership) and followers' safety compliance, and the mediations of safety-specific distributive justice and role ambiguity. Methods: On a two-wave online survey of 307 workers from high-risk enterprises in China, these relationships were tested by structural equations modeling and bootstrapping procedures. Results: Findings show that safety-specific leader reward omission was negatively associated with followers' safety compliance through the mediating effects of safety-specific distributive justice and role ambiguity. Safety-specific leader punishment omission was also negatively associated with followers' safety compliance through the mediating effect of safety-specific role ambiguity, while safety-specific distributive justice was an insignificant mediator. Originality: The study addresses and closes more gaps by explaining how two contextualized laissez-faire leadership measures relate to followers' safety behaviors, following the contextualization and matching principles between predictors, mediators and criteria, and by revealing two mechanisms behind the detrimental effects of laissez-faire leadership on safety outcomes.publishedVersio

Glycinergic feedback enhances synaptic gain in the distal retina

Author Posting. © The Author(s), 2013. This is the author's version of the work. It is posted here by permission of the Physiological Society for personal use, not for redistribution. The definitive version was published in Journal of Physiology 592 (2014): 1479-1492, doi:10.1113/jphysiol.2013.265785.Glycine input originates with interplexiform cells, a group of neurons situated within the inner retina that transmit signals centrifugally to the distal retina. The effect on visual function of this novel mechanism is largely unknown. Using gramicidin-perforated patch whole-cell recordings, intracellular recordings, and specific antibody labeling techniques, we examined the effects of the synaptic connections between glycinergic interplexiform cells, photoreceptors, and bipolar cells. To confirm that interplexiform cells make centrifugal feedback on bipolar cell dendrites, we recorded the post-synaptic glycine currents from axon-detached bipolar cells while stimulating pre-synaptic interplexiform cells. The results show that glycinergic interplexiform cells activate bipolar cell dendrites that express the α3 subunit of the glycine receptor, as well as a subclass of unidentified receptors on photoreceptors. By virtue of their synaptic contacts, glycine centrifugal feedback increases glutamate release from photoreceptors, and suppresses the uptake of glutamate by the EAAT2 transporter on photoreceptors. The net effect is a significant increase in the synaptic gain between photoreceptors and their second-order neurons.This study was supported by grants from the National Science Foundation (NSF, IOS-1021646, WS) and the National Eye Institute (NEI, EY 14161, WS)