Survival Modelling for Data From Combined Cohorts: Opening the Door to Meta Survival Analyses and Survival Analysis Using Electronic Health Records

Non-parametric estimation of the survival function using observed failure time data depends on the underlying data generating mechanism, including the ways in which the data may be censored and/or truncated. For data arising from a single source or collected from a single cohort, a wide range of estimators have been proposed and compared in the literature. Often, however, it may be possible, and indeed advantageous, to combine and then analyse survival data that have been collected under different study designs. We review non-parametric survival analysis for data obtained by combining the most common types of cohort. We have two main goals: (i) to clarify the differences in the model assumptions and (ii) to provide a single lens through which some of the proposed estimators may be viewed. Our discussion is relevant to the meta-analysis of survival data obtained from different types of study, and to the modern era of electronic health records.     

Are cooperatives gender sensitive? A confirmatory and predictive analysis of women's collective entrepreneurship

The literature on entrepreneurship has developed a huge body of fruitful research to explain why women do not engage in business as often as men. However, relatively little is known about the role that different business models may play in driving women's entrepreneurial activity, which is examined in this study. In this paper we develop a model to empirically test the relationship between women's motivations to become entrepreneurs and their willingness to embark on business through cooperatives, a particular organizational model. We find that the fit between women's needs and expectations and the guiding principles of cooperatives is decisive for the materialization of female entrepreneurship. Furthermore, we explore the role that institutions can play in fostering this link. In doing so, we extend the literature on women's entrepreneurship by highlighting key factors to better channel the development of this potential resource for economic development. Our confirmatory model highlights the role of cooperatives as a type of organization particularly suited to the interests and needs of women entrepreneurs. Thus, the promotion of this business model can be useful to improve the number of women entrepreneurs and, in turn, enhance economic development.     

The relationship between business characteristics and ICT deployment in the rural tourism sector. The case of Spain

The deployment of information and communication technologies (ICT) is crucial for the competitiveness of rural tourism businesses. It is therefore important to know the relation between a firm's characteristics and ICT deployment. This study makes two hierarchical segmentations to predict the behaviour of these firms when deploying the Web and e‐mail. This work determines which characteristics are related to ICT deployment. Activity and category are the two characteristics that most effectively predict a firm's behaviour, whereas location and size are less effective. These results have implications for entrepreneurial behaviour and for public agents working in rural tourism. Copyright © 2009 John Wiley & Sons, Ltd.     

BargCrEx: A System for Bargaining Based Aggregation of Crowd and Expert Opinions in Crowdsourcing

Group Decision and Negotiation - Crowdsourcing and crowd voting systems are being increasingly used in societal, industry, and academic problems (labeling, recommendations, social choice, etc.) due...     

The entanglement of time and cost deviations in public projects

There is growing concern regarding cost and time overruns in public projects. However, despite the extensive literature on the subject, there is relatively little research on the impact of time overruns on cost overruns. This study assesses whether larger time deviations can lead to larger cost deviations. Our hypothesis is that a project with a time overrun is more likely to also have a cost overrun. The authors used a sample of 208 projects in Portugal, with data collected from the Portuguese Court of Auditors. Using the data, a number of econometric models were developed: Ordinary Least Squares, Generalized Linear Model, Tobit, and Probit. The instrumented variables and structural equation modelling techniques were applied to address potential endogeneity in the data. The analysis was controlled for factors such as political, governance, economic, and project variables. The results suggest that larger time deviations are associated with larger cost deviations. The inference is that projects that take longer to complete also tend to suffer from cost overruns.     

Density forecasting with Bayesian Vector Autoregressive models under macroeconomic data uncertainty

Macroeconomic data are subject to data revisions. Yet, the usual way of generating real-time density forecasts from Bayesian Vector Autoregressive (BVAR) models makes no allowance for data uncertainty from future data revisions. We develop methods of allowing for data uncertainty when forecasting with BVAR models with stochastic volatility. First, the BVAR forecasting model is estimated on real-time vintages. Second, the BVAR model is jointly estimated with a model of data revisions such that forecasts are conditioned on estimates of the ‘true’ values. We find that this second method generally improves upon conventional practice for density forecasting, especially for the United States.     

A social capital approach of market orientation in public non-profit organizations: The case of blood transfusion centers in Spain

In order to identify the determinants of market (donor) orientation in blood transfusion centers and services (BTCS), this study seeks to analyze whether connectedness and interpersonal trust represent a fundamental basis for interfunctional coordination that leads to market (donor) orientation. An empirical study was carried out with 147 participants from 14 Spanish BTCS. The measurement scales were validated through CFA and the proposed relationship model was tested using SEM. Both interpersonal trust and connectedness that exist among BTCS members foster interfunctional coordination and, ultimately, their donor orientation. Thus, BTCS must emphasize their internal relationship networks, rearranging them in favor of their donor orientation. This paper integrates social capital literature with market orientation literature, and it proposes empirical evidence on the role played by internal social links on interfunctional coordination, which leads to market orientation. This research proposes a reliable and valid measure of blood donor orientation, which could be useful for the future testing of theory and research in the non-profit context. BTCS should adopt an organizational design which allows the introduction of a new managerial paradigm. People in charge of different areas at BTCS must pay particular attention to the climate of trust and the level of connectedness in cross-functional relationships. The negative evolution of blood donation and the results of this research suggest that BTCS need to apply a management model focused on the donor, in order to achieve a sustainable donation system.     

The influence of partners' known preferences on auditors' sceptical judgements: The moderating role of perceived social influence pressure

We examine the moderating effect of auditors' perceived social influence pressure on the influence of partners' known preferences on auditors' sceptical judgements in China. We invoke social influence theory to provide complementary insights into the driving forces behind auditors' judgements, over and above the pressure arising from accountability. We hypothesise that the influence of partners' known preferences on auditors' sceptical judgements is stronger for auditors who perceive higher social influence pressure than those who perceive lower pressure. Our results support the hypothesis and establish the value of understanding auditors' perceived social influence pressure in managing partners' communication with audit teams.