An improved class of estimators for the population mean

Starting from the Rao (Commun Stat Theory Methods 20:3325–3340, 1991) regression estimator, we propose a class of estimators for the unknown mean of a survey variable when auxiliary information is available. The bias and the mean square error of the estimators belonging to the class are obtained and the expressions for the optimum parameters minimizing the asymptotic mean square error are given in closed form. A simple condition allowing us to improve the classical regression estimator is worked out. Finally, in order to compare the performance of some estimators with the regression one, a simulation study is carried out when some population parameters are supposed to be unknown.     

TRUST,COORDINATION, AND THE INDUSTRIAL ORGANIZATION OF POLITICAL ACTIVISM

We study political activism by several interest groups with private signals. When their ideological distance to the policymaker is small, a “low‐trust” regime prevails: agents frequently lobby even when it is unwarranted, taking advantage of the confirmation provided by others' activism; conversely, the policymaker responds only to generalized pressure. When ideological distance is large, a “high‐trust” regime prevails: lobbying behavior is disciplined by the potential contradiction from abstainers, and the policymaker's response threshold is correspondingly lower. Within some intermediate range, both equilibria coexist. We then study the optimal organization of influence activities, contrasting welfare levels when interest groups act independently and when they coordinate. (JEL: D72, D78, D82)     

Empowering manufacturing personnel through functional understanding

A growing interest in knowledge management and standardisation, has increasingly led organisations to implement employee training programs. For the manufacturing workforce, however, these remain limited to informal ‘On-the-Job’ approaches, administered by peer colleagues – particularly in Small and Medium Enterprises (SMEs) where economic, educational, cognitive and cultural constraints are often deeply embedded. This paper proposes a methodology for training the manufacturing workforce on the functions of products, and presents a case study conducted in a UK-based manufacturing SME – aiming to verify our two research hypotheses: a) Functional Analysis Diagrams of the company’s products and parts would assist in knowledge assimilation; and, b) knowledge assimilation has a positive effect on work quality and productivity levels. By applying statistical inference methods on long-term quantitative data and survey results, we confirmed substantial improvements in work quality (63%) and increased productivity (67%), supporting our hypotheses and suggesting that the proposed methodology can be a promising solution for the industry.     

SMEs and Marketing: A Systematic Literature Review

This paper presents a systematic review of recent academic literature analysing the role, organization and management of marketing activities in small and medium‐sized enterprises (SMEs). To this end, 310 articles published between 2006 and 2015 in 69 main journals devoted to small firms/entrepreneurship and management/marketing fields were analysed. This review shows that SMEs’ marketing has received great attention in both management and marketing literature in recent years. Findings reveal, on the one hand, the emerging role of networks and information and communication technologies in marketing behaviour by SMEs, and on the other hand a research gap in terms of specific marketing practices. Entrepreneurial marketing has been used as the main conceptual framework in reviewed studies, even if findings overall still point out a distance between the theoretical bases of reviewed contributions and the study of SMEs’ marketing behaviour and practices. Therefore, future research on the role of resources, relationships and networks could benefit from the combination of theories developed within the field of entrepreneurship with other approaches such as the resource‐based view, the dynamic capabilities theory and the Industrial Marketing and Purchasing (IMP) framework.     

Interlocking directorship across Italian listed companies: evidence from a natural experiment

The financial crisis of 2008 and the introduction of the Interlocking Ban in 2011 (for financial firms) deeply influenced the Italian corporate governance system. The aim of the present study is to investigate to what extent personal ties among the directors of Italian listed companies have changed after these two events. We describe the evolution and dimension of the phenomenon of interlocking directorship (ID) for all the Italian listed companies over the period 1998–2013 using different methodologies. Social network analysis discloses the existence of clusters of companies whose links remain dense after the crisis, while connections to the peripheral units of the system decrease, reducing the overall connectedness. Results reveal that, over the period, there is a reduction in the cumulation ratio which still remains high and mainly due to a high number of directorships for multiple directors. This reduction is more severe after 2008 when both the financial crisis and the Interlocking Ban occur. In disentangling the two effects we observe ID reduction during and after the crisis, also for non-financial firms, confirming the general tendency of a decline in national board interlocking networks.     

Measuring Organised Crime Presence at the Municipal Level

Social Indicators Research - While indicators assessing the quality of life often comprise measures of crime or fear of crime, these components usually refer to property or violent crimes. More...     

Perceived Corruption and Individuals’ Life Satisfaction: The Mediating Role of Institutional Trust

Social Indicators Research - Corruption degrades the quality of institutions, increases economic inequality and limits growth. Recent studies indicate that corruption is also associated with lower...     

The dynamic stochastic topic block model for dynamic networks with textual edges

Statistics and Computing - The present paper develops a probabilistic model to cluster the nodes of a dynamic graph, accounting for the content of textual edges as well as their frequency. Vertices...     

Childhood family structure and schooling outcomes: evidence for Germany

We analyze the impact on schooling outcomes of growing up in a non-intact family in Germany. We find that this experience is associated with worse outcomes according to estimates from models that do not control for possible correlations between common unobserved determinants of family structure and educational performance. Evidence of adverse effects emerges also when endogeneity is accounted for. In such cases, however, the point estimates are typically smaller, and their confidence intervals are large enough to include zero, particularly for individuals who grew up in Western Germany.