Regression analysis on serial dilution data from virus validation robustness studies

To ensure the safety of plasma-derived medicinal products, the Dutch Blood Supply Foundation (Sanquin) performs virus validation experiments. Data from these experiments are based on serial dilution assays. Regression analysis on assay data faces several problems: only a small number of data points are available, data contain censoring and are subject to sampling error. Furthermore, the process variability inherent to the experiments is not evident. In this paper we address these problems by introducing a regression model for serial dilution data and by analyzing how validation experiments and simulation techniques can help elucidate various sources of variability the experiments are subject to. These are then incorporated into the regression model.     

The Relationship Between Firm Size and Innovation Activity: A Double Decision Approach†

The main purpose of this paper is to analyse the relationship between firm size and innovation activity using Spanish data at firm level corresponding to the manufacturing sector for the period 1990-93. This exercise is different to previous applications because we allow for different size effects in the decision to innovate and the innovation count equation, in the context of a double-hurdle approach. Several tests confirm the hurdle negbin model. We find that firm size is a relevant factor, although size effects are different in both decisions. A robust result from the different specifications estimated is the rejection of the Gilbert and Newbery hypotheses. We find out that the behaviour of firm size is neither linear in the decision nor in thc count equation. We also provide additional, and sometimes different, evidence to previous Spanish studies on R&D.     

Firm Performance and Women on the Board: Evidence from Spanish Small and Medium-Sized Enterprises

ABSTRACT

This study examines gender diversity on boards of directors in a sample of nonfinancial Spanish small and medium-sized enterprises (SMEs) for 2003–8, finding that the probability of women on the board increases with firm performance, defined as return on assets, and family ownership, but diminishes with corporate ownership and firm risk. It also finds, when examining the full sample, a positive effect of the presence of women board members on firm performance. The study also obtains a similar positive effect in most subsamples, including in firms with corporate ownership, where family connections play less role in the election of board members, and in firms in the secondary and tertiary sectors, which are characterized by having greater proximity to final consumers than those in the primary sector.     

The determinants of trade performance: influence of R&D on export flows

A theoretical model is presented, in which supply side differences between countries determine international trade flows. This model is empirically tested at a sectoral level for a group of EU countries, within a framework that focuses on changes through time and differences between countries. The results show that the validity of the theoretical model is limited at sectoral level. However, as expected, we find that the variable representing technological differences is significant and correctly signed for high-technology sectors. The evidence points to the existence of different production functions across countries and to the importance of supply side factors in determining the direction and the terms of trade.     

Atributos de calidad del servicio de la telefonía móvil para clientes mexicanos y su impacto en la satisfacción y en la lealtad hacia la marca

The objective of this study is to identify relevant attributes of service quality in mobile phones for Mexican customers and to establish their impact on customer satisfaction and brand loyalty. It is being assumed that the attributes of service quality are an antecedent of satisfaction and loyalty. The study is divided in two phases. In a first qualitative phase, thirteen attributes were detected using in-depth interviews. In a second quantitative phase, these attributes were empirically contrasted with variables of satisfaction and loyalty. It was found that only six attributes are statistically related to the variables of these constructs, with two of them being the most relevant: price per minute and empathy perceived by customers from company’s employees.     

The effects of education on spouses’ satisfaction in Europe

This article identifies the effects of both own and spouses' education levels on individual economic satisfaction for European households. To that end, it estimates several specifications based on the family collective approach, for each of the 14 EU countries, by using the eight waves of the European Community Household Panel, 1994–2001. After demonstrating that the IV Hausman–Taylor procedure is the selected estimation method in the majority of cases, the empirical results show that male and female income satisfaction significantly increases when the husband achieves higher education qualifications in the majority of European countries. However, the positive effect of the wife's higher education on female income satisfaction only appears in a very limited number of countries. Additionally, increases in individual wage and nonwage incomes generally lead to higher satisfaction levels.     

From real estate to consumption: the role of credit markets in the USA

The aim of this article is to test whether the credit market conditions affect the strength of transmission of real estate wealth effects on household consumption in the US economy. Although many different works have dealt with the analysis of the existence of a real estate wealth effect, most of them as a reaction to the dramatic increase of housing prices in several OECD countries, there are only few papers analysing whether the consumption response depends on the positive or negative sign of the wealth shock and, as far as we know, none of them takes the effects of credit market conditions on that asymmetric response into account. This article tries to fill the existing gap in the literature on this matter. From an econometric perspective, we estimate the asymmetries in the consumption response within the momentum threshold autoregressive model (M-TAR) proposed by Enders and Siklos (2001), but following Stevans (2004), it is applied to a multivariate framework. The main results show that the credit market conditions play a significant role in the transmission of changes in real estate wealth to consumption. In addition, we find that there exists an asymmetric behaviour in the US aggregate consumption spending responses to real estate wealth and credit market shocks, which is only significant when a negative shock takes place.     

Economic growth as a function of human capital,internet and work

The World Bank has suggested the need to enhance Information and Communication Technology skills in all sectors because a 10% increase in internet connectivity was found to boost GDP growth by 1.38%. Simultaneously, the OECD argued that high internet access rates generate a 2% increase in GDP. Because the internet positively affects economic growth, we investigated the relationship between an economically active population, human capital and technology to evaluate these effects in Mexico. A data series from 1991 to 2010 was analysed in three stages according to the least-squares method. A Cobb–Douglas function under the Solow model was considered. Technology and internet access were found to positively affect top-level students and graduate students and thus contribute to the global innovation index.     

The development of a stakeholder-based scale for measuring corporate social responsibility in the banking industry

Research on corporate social responsibility (CSR) has notably increased in recent years and many scales for measuring CSR image have been developed in academic literature. Due to the contextual character recognized in the implementation of CSR strategies, in this paper a new scale based on stakeholder theory is developed to evaluate customers’ perception regarding the CSR performance of their banking service providers. The proposal of reliable measurement tools for evaluating customers’ perception is especially relevant for companies because of their significant role in influencing the design and implementation of corporate strategies. Results demonstrate the reliability and validity of this new scale in two different samples. In the banking industry, CSR includes corporate responsibilities toward customers, shareholders, employees, society, and all legal and ethical requirements of banking institutions. Nevertheless, different kinds of banking institutions have specific CSR images, which reveal different strategic approaches to CSR.     

Economic Growth and Convergence of EU Member States: An Empirical Investigation

The aim of this article is to construct a European production frontier using deterministic methods, and to break down growth and convergence during the period 1980–2001. The results show that EU growth is primarily driven by physical and human capital accumulation, the contribution of which is essential for the cohesion of European countries. We find capital accumulation and efficiency change to be important convergence factors within the EU, while technical change has worked against it. The approach used has also enabled us to analyze the differences in growth performance of Member States and highlight the role of human and public capital, supporting the European cohesion and development policies carried out in this period.