Time series modeling of histogram-valued data: The daily histogram time series of S&P500 intradaily returns

Histogram time series (HTS) and interval time series (ITS) are examples of symbolic data sets. Though there have been methodological developments in a cross-sectional environment, they have been scarce in a time series setting. Arroyo, González-Rivera, and Maté (2011) analyze various forecasting methods for HTS and ITS, adapting smoothing filters and nonparametric algorithms such as the k-NN. Though these methods are very flexible, they may not be the true underlying data generating process (DGP). We present the first step in the search for a DGP by focusing on the autocorrelation functions (ACFs) of HTS and ITS. We analyze the ACF of the daily histogram of 5-minute intradaily returns to the S&P500 index in 2007 and 2008. There are clusters of high/low activity that generate a strong, positive, and persistent autocorrelation, pointing towards some autoregressive process for HTS. Though smoothing and k-NN may not be the true DGPs, we find that they are very good approximations because they are able to capture almost all of the original autocorrelation. However, there seems to be some structure left in the data that will require new modelling techniques. As a byproduct, we also analyze the [90,100%] quantile interval. By using all of the information contained in the histogram, we find that there are advantages in the estimation and prediction of a specific interval.     

An investigation of the use of global, virtual, and colocated new product development teams

This paper presents the results of an investigation of differences between global, virtual and colocated new product development (NPD) teams. Specifically, we examined whether and how these three types of teams differed in terms of usage, challenges, and performance. A survey of PDMA members was undertaken to collect the data. Out of 103 firms participating in the survey, 54 had used or were using global teams for some of their NPD efforts. Overall, we found that the use of global teams in our respondent firms is rapidly increasing. Our respondents indicated that by the year 2001, approximately one out of every five NPD teams in their companies are likely to be global. However, our respondents also expect that their companies will be using multiple types of teams that is, global, virtual, and colocated, to develop their new products. Our findings also suggest that global teams generally face greater behavioral and project management challenges than either colocated or virtual teams. Global team performance is also lower than the performance of virtual or colocated teams. Are these challenges associated with poorer performance? In examining this question, our results suggest that greater project management challenges are associated with lower performance, for all three types of teams. Surprisingly, behavioral challenges were not associated with performance for any team type. Our results suggest that firms face different problems associated with managing each type of NPD team—global, virtual and colocated. To effectively manage each type of team may, in turn, require that companies and their managers employ different solutions to these different problems. Additionally, companies may find that the preparation they provide to their managers and team members to work in these different team environments may also need to be different. Further research is clearly needed to address these managerial implications.     

International generation of technology: an assessment of its intensity,motives and facilitators

This paper assesses two decades of international generation of technology through EPO data: we quantify its volume, analyse its motives and identify several business traits that facilitate its implementation. Our database, which is composed of 65,000 firms and 465,000 patents, shows that most technological activities are still carried out in the home country of multinationals. We nevertheless find that the international generation of technology has been continuously increasing during the 80s and 90s. This growing trend partially reflects the use of global technological supply as a source of new competences; however, data verifies that adapting products and processes to foreign markets is an even more relevant motive. Lastly, after controlling for the home country and geographic diversification of multinationals, we search for structural and technological business features that make the internationalisation of their technological activities easier. Our model thus verifies the relevance of the size and technological activity of parent companies.     

Measuring the antecedents of e-loyalty and the effect of switching costs on website

This paper deals with the process by which electronic customer loyalty (e-loyalty) is formed. The twofold aim is to analyse e-loyalty, describing its development in terms of how it is influenced by several determinants and to study potential barriers to switching which significantly affect the repeat purchase decision. In particular, an integrating theoretical framework is proposed to determine the e-loyalty dependency of electronic service quality and perceived value, and how this last relationship can be moderated by switching costs. Results offer evidence for the important role of customer's perceptions of e-service quality and value in e-loyalty. Proposals are made of how companies that are online can use this knowledge to build marketing strategies.     

The antecedents and consequences of organizational and personal commitment in business service relationships

This paper explores the potential for business service customers to form separate bonds of commitment with the service firm and the service representative. It examines the role of the individual and identifies six potential antecedents to each type of commitment. It also proposes that both types of commitment will influence the degree of relational exchange between the customer and the service firm. The hypotheses are tested using multiple regression and data from a survey of marketing research managers. The results support the majority of the hypotheses.     

The pricing of time-varying beta

We generalize an asset pricing model based on the Arbitrage Pricing Theory (APT) allowing beta to be time-varying. Making beta a random variable adds flexibility to the model because permits a non-linear relation between individual returns and the set of factors, and accounts for the effect of possible omitted variables. We integrate the conditional APT with a general linear stochastic process for beta. We analyze the behavior of the conditional expected return, the conditional variance and conditional covariance of individual asset returns as functions of the conditional moments of beta. On considering time-varying betas we introduce another source of uncertainty (risk) independent of the factors. We need to disentangle if this extra risk is systematic or non-systematic. To this end, we introduce a modified conditional APT model that rationalizes why the time variation of beta may represent extra systematic risk. For a sample of individual stocks, we test the hypothesis of time-varying beta and the feasibility of the modified conditional APT. We present a test for time-varying beta based on the conditional second moments of returns. We find that there is strong evidence against constancy of betas in favor of a random coefficient model, and that the time variation of beta is due to non-systematic behavior of the firms and investors should be able to diversify this risk away.     

Pass‐Through and the Prediction of Merger Price Effects

We use Monte Carlo experiments to study how pass‐through can improve merger price predictions, focusing on the first order approximation (FOA) proposed in Jaffe and Weyl [ 2013 ]. FOA addresses the functional form misspecification that can exist in standard merger simulations. We find that the predictions of FOA are tightly distributed around the true price effects if pass‐through is precise, but that measurement error in pass‐through diminishes accuracy. As a comparison to FOA, we also study a methodology that uses pass‐through to select among functional forms for use in simulation. This alternative also increases accuracy relative to standard merger simulation and proves more robust to measurement error.     

“99.9% effective”: calculating credibility and consuming trust in antibacterial promises

This article introduces the phrase “99.9% Effective” – the claim brandished on all manner of antibacterial hand sanitizers – as a contemporary marketplace icon. It establishes the contexts of global contagious risk in which antibacterial hand sanitizers' “99.9% Effective” claim proliferates and becomes a marketplace icon. Beginning from the premise that there is no separation between our material consumption of hand sanitizers and our consumption of the cultures of the antibacterial promise, it analyzes the material meaning of this marketplace icon. Situated amid a backdrop of quotidian but potentially catastrophic twenty-first century systemic microbial risk, this article uncovers the relationship between conditions of trust, the cultures of calculation and the work of consuming this marketplace icon.     

Ethical issues in counseling: a trend analysis

The purpose of this study was to examine research about Ethical Issues in Counseling published in selected professional sources and databases between the period of 1986–2017. The data on documents relating ethical issues contained in the Web of Science, EBSCO, Scopus, Taylor & Francis collected were analyzed using content analysis. Ethical issues, Ethical dilemmas and counseling psychology related keywords and phrases were employed together in the analysis of the documents. In total 157 documents were categorized among be relevant to Ethical issues and counseling and they were analyzed. The results reveal that 2010 was the year the most articles on counselling ethics were published. From 2014 to date there has also been a steady increase in articles on ethics in counseling. This is largely because of the increase in articles in counselling psychology as both developing and developed countries employ such research more to solve their social problems, indigenizing psychological research. The study also revealed that America produced more than half of the sampled articles (51.6%).