Nikos Korfiatis

Nikos Korfiatis
University of East Anglia | UEA · Norwich Business School

PhD

About

80
Publications
62,687
Reads
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1,663
Citations
Introduction
More information on my github profile: http://nkorf.github.io
Additional affiliations
January 2015 - January 2016
University of East Anglia
Position
  • Professor (Assistant)
March 2011 - December 2014
Goethe-Universität Frankfurt am Main
Position
  • Managing Director
January 2009 - February 2011
University of Copenhagen
Position
  • Senior Researcher
Education
January 2006 - July 2009
August 2004 - January 2006
KTH Royal Institute of Technology
Field of study
  • Human Computer Interaction and Information Retrieval
September 2000 - July 2004
Athens University of Economics and Business
Field of study
  • Management Science and Technology

Publications

Publications (80)
Article
Full-text available
Online reviews on mobile app marketplaces help consumers evaluate whether a mobile app fits their needs before upgrading or purchasing it. This study explores how online reviews influence trial attitude formation, a process that naturally bears on cognitive structure as much as on users' emotional responses to online experience. We experimentally m...
Article
Full-text available
Online consumer reviews play an important role in the decision to purchase services online, mainly due to the rich information source they provide to consumers in terms of evaluating “experience”-type products and services that can be booked using the Internet, with online travel services being a significant example. However, different types of tra...
Article
Full-text available
Online reviews have received much attention recently in the literature, as their visibility has been proven to play an important role during the purchase process. Furthermore, recent theoretical insight argue that the votes casted on how helpful an online review is (review helpfulness) are of particular importance, since they constitute a focal poi...
Article
Full-text available
Taking a structuration perspective while integrating reciprocity research in economics, this study examines the dynamics of reciprocal interactions in social Q&A communities. We postulate that individual users of social Q&A constantly adjust their kindness into the direction of the observed benefit and effort of others. Collective reciprocity emerg...
Article
We develop an integrated conceptual model of the drivers and outcomes of consumers’ intentions to buy organic goods, anchored on the Theory of Planned Behavior. Our meta-analysis uses data extracted from 149 studies reported in 135 articles. The results indicate that, as opposed to consumers who are price-conscious, individuals who are environmenta...
Article
Purpose Last mile distribution is a crucial element of any supply chain network, and its complexity has challenged established practices and frameworks in the management literature. This is particularly evident when demand surges, as with recent lockdowns due to the COVID-19 pandemic and subsequent demand for home delivery services. Given the impor...
Article
Building on the stimulus-organism-response (S-O-R) theory, this study identifies and empirically tests the prominence of various technology-related, consumer characteristics, and situational variables (Stimuli) on fostering impulsive habits among mobile shoppers. We further examine the direct and indirect effects of consumer impulsiveness on the us...
Article
Full-text available
Evidence-based methods for evaluating marketing interventions such as A/B testing have become standard practice. However, the pitfalls associated with the misuse of this decision-making instrument are not well understood by managers and analytics professionals. In this study, we assess the impact of stationarity on the validity of samples from cond...
Article
Full-text available
National culture exerts substantial influence on consumers' expectations, satisfaction, and evaluations. Despite that, within a service-based context, two cultures are met, that of the customer and that of the service provider, the existing literature systematically explores the effect of customer culture in isolation neglecting the impact of the p...
Article
Full-text available
This paper investigates the informational value of online reviews posted by employees for their employer, a rather untapped source of online information from employees, using a sample of 349,550 reviews from 40,915 UK firms. We explore this novel form of electronic Word-of-Mouth (e-WOM) from different perspectives, namely: (i) its information conte...
Conference Paper
We develop an integrated conceptual model of the drivers and outcomes of consumers’ intentions to buy organic goods, anchored on the Theory of Planned Behavior. This is meta-analytically tested using data collected from 70 empirical studies conducted on the subject during the period 2000-2019. The results indicate that, as opposed to consumers who...
Article
Full-text available
We explore differences in airline passengers' online ratings toward domestic and foreign carriers. Using a dataset of more than 380,000 airline passenger reviews obtained from TripAdvisor, we show that on average passengers express higher satisfaction (as proxied by their overall rating) for airline service encounters with domestic carriers, exhibi...
Conference Paper
We develop a conceptual model of the antecedents and outcomes of consumer intentions to buy organic goods, anchored on the Theory of Planned Behavior. This is tested using a meta-analysis of data collected from 79 empirical studies. Our results confirm that, as opposed to consumers who are price conscious, individuals who are environmentally and he...
Article
Full-text available
This paper presents learning analytics data for measuring the impact of study satisfaction on students' academic self-efficacy and performance. For this purpose, a specially designed questionnaire was developed and distributed across 124 undergraduate students. Preliminary analysis using descriptive statistics for items and confirmatory factor anal...
Article
Full-text available
We explore a special case of electronic word of mouth that of employees' online reviews to study the determinants of job satisfaction and employee turnover. We perform our analysis using a novel dataset of 297,933 employee online reviews from 11,975 US tourism and hospitality firms, taking advantage of both the review score and text. Leadership and...
Article
Full-text available
This study examines the impact of interest rates, fuel prices, and market concentration on airline service performance. Rather than focusing on an airline-level analysis, we employ aggregated data from the US Department of Transportation (DOT) and the Airline Consumer Report (ACR) to explore four airline service performance metrics, namely: on-time...
Chapter
Full-text available
Diabetic Retinopathy (DR), one of the most devastating manifestations of diabetes, is a leading cause of blindness among working-age adults. WHO predicts the prevalence of diabetes to increase substantially in the future, leading to an increasing pressure on public health services. In the context of smart healthcare, DR screening has been widely ad...
Chapter
The drive among business partners to secure resources is one of the very reasons for establishing relationships between buyers and sellers. Inevitably, the web of interdependencies in which they are caught gives rise to power, whereby one party tries to control the behavior of the other. This pivotal role of power in buyer-seller relationships has...
Article
Full-text available
Purpose Although the literature has established the effect of online reviews on customer purchase intentions, the influence of psychological factors on online ratings is overlooked. This paper aims to examine these factors under the perspective of construal level theory (CLT). Design/methodology/approach Using review data from TripAdvisor and Bo...
Article
Full-text available
Service quality is a multi-dimensional construct which is not accurately measured by aspects deriving from numerical ratings and their associated weights. Extant literature in the expert and intelligent systems examines this issue by relying mainly on such constrained information sets. In this study, we utilize online reviews to show the informatio...
Article
Full-text available
Consumer adoption of mobile shopping apps is an emerging area in m-commerce which poses an interesting challenge for retailers and app developers. In this study, we adapt the Unified Theory of Acceptance and Use of Technology 2 (UTAUT2) to investigate factors predicting consumer behavioral intention (BI) and use behavior (UB) towards mobile shoppin...
Article
Full-text available
Customers increasingly consult opinions expressed online before making their final decisions. However, inherent factors such as culture may moderate the criteria and the weights individuals use to form their expectations and evaluations. Therefore, not all opinions expressed online match customers' personal preferences, neither can firms use this i...
Preprint
Full-text available
We use online reviews from Glassdoor to study the effect of employee satisfaction on corporate performance in the UK. Our results indicate that employee satisfaction positively impacts firm profitability, but this is not fully recognised by equity investors. JEL classification: G01; G03; M05
Article
This study addresses diabetes physicians’ information seeking behavioural paths (digital, conventional, interpersonal) which lead to information needs satisfaction and the barriers encountered in this process. The study was based on empirical evidence from a survey of 159 physicians. Theoretical analysis was informed by Wilson’s model of informatio...
Article
Full-text available
Though several industry reports have suggested that the rate of shopping cart abandonment is high in the mobile channel, the reasons for such abandonment remain relatively unexplored. Drawing on the cognition-affect-behavior (CAB) paradigm, this study aims to provide a conceptual framework explaining why consumers hesitate to use mobile channels fo...
Technical Report
Full-text available
An overwhelming stream of research suggests that online reviews impact firms' profits positively. In this study we show conditions where this may not hold true. In a vertical market, we identify strategies that a manufacturer can utilize to affect a retailer's attitude towards publicizing consumer reviews. We model a two-period multi-stage game whe...
Chapter
This chapter introduces the concept of heterogeneity as a perspective in the architecture of big datasystems targeted to both vertical and generic workloads and discusses how this can be linked with theexisting Hadoop ecosystem (as of 2015). The case of the cost factor of a big data solution and its characteristicscan influence its architectural pa...
Chapter
Full-text available
In the first part of this chapter we illustrate how a big data project can be set up and optimized. We explain the general value of big data analytics for the enterprise and how value can be derived by analyzing big data. We go on to introduce the characteristics of big data projects and how such projects can be set up, optimized and managed. Two e...
Chapter
Full-text available
This chapter introduces the concept of heterogeneity as a perspective in the architecture of big data systems targeted to both vertical and generic workloads and discusses how this can be linked with the existing Hadoop ecosystem (as of 2015). The case of the cost factor of a big data solution and its characteristics can influence its architectural...
Article
This paper aims to present a systematic literature review of research in music information seeking and its application to musical creativity and creative activities and in particular composition, performance and improvisation, and listening and analysis. A seed set of 901 articles published between 1973 and 2015 was evaluated and in total 65 studie...
Article
Full-text available
Purpose – The purpose of this paper is to examine information seeking behaviour targeted to music information seeking by amateur musicians, accompanied with empirical evidence from a survey on a community concert band. While several studies in the literature have examined information seeking in the context of hedonic motives (e.g. entertainment ori...
Article
Helpfulness prediction of online consumer reviews is an interesting research topic with immediate practical applications both from a data mining and marketing perspective. As such a set of studies have been published in the last few years to tackle this problem, targeting the reviews' textual characteristics. In this paper, we propose and evaluate...
Article
Full-text available
The well-known 3V architectural paradigm for Big Data introduced by Laney (2011), provides a simplified framework for defining the architecture of a big data platform to be deployed in various scenarios tackling processing of massive datasets. While additional components such as Variability and Veracity have been discussed as an extension to the 3V...
Conference Paper
With the continuous increase of online services as well as energy costs, energy consumption becomes a significant cost factor for the evaluation of data center operations. A significant contributor to that is the performance of database servers which are found to constitute the backbone of online services. From a software approach, while a set of n...
Conference Paper
Recent attention on the potentiality of cost-effective infrastructures for capturing and processing large amounts of data, known as Big Data has received much attention from researchers and practitioners on the field of analytics. In this paper we discuss on the possible benefits that Big Data can bring on TEL by using the case of large scale compa...
Article
Full-text available
Purpose – The purpose of this paper is to examine information seeking behaviour targeted to music information seeking by amateur musicians, accompanied with empirical evidence from a survey on a community concert band. While several studies in the literature have examined information seeking in the context of hedonic motives (e.g. entertainment ori...
Article
Government regulation of the clinical practice is a characteristic aspect of the medical profession. Regardless of whether this regulation derives from government sourced guidelines or materials from government-sponsored institutions, it results to a high production of information resources (institutional information resources) which are disseminat...
Article
With the continuous increase of online services as well as energy costs, energy consumption becomes a significant cost factor for the evaluation of data center operations. A significant contributor to that is the performance of database servers which are found to constitute the backbone of online services. From a software approach, while a set of n...
Article
Online consumer reviews constitute an integral aspect of electronic transactions as they play a part in lowering customer uncertainty during purchase decision making. This paper studies the aspect of negativity exhibited on the justification of its valence by the review text (as a dependent variable) and the influence of product price and product t...
Article
This paper examines gender effects reported in a quasi-experimental implementation of a social dilemma using Facebook profile owners as subjects. By sending personal invitations via Facebook interest groups, we were able to recruit a fairly large number of participants (N=216) who participated in a “one-shot” variation of the Voluntary Contribution...
Article
Psychologists are an understudied population in terms of information needs and information seeking behavior. This article provides theoretical analysis accompanied with some empirical evidence drawn from a nationwide survey of psychologists working in the Greek National Healthcare System GNHS. The empirical study was conducted during the spring of...
Article
In this paper we describe a methodology for binary encoding of citation metadata which targets the problems of versioning generated from the function of the web agents and/or crawlers on which Google Scholar and Citeseer systems operate. Typically citation indexes require a period of time in order to index the cited articles and update their counte...
Article
Purpose – This paper aims to present the semantic content identifier (SCI), a permanent identifier, computed through a linear-time onion-peeling algorithm that enables the extraction of semantic features from a text, and the integration of this information within the permanent identifier. Design/methodology/approach – The authors employ SCI to prop...
Conference Paper
Full-text available
Building on the interpersonal evaluation theory in social psychology, this study explores the existence of a negativity bias in evaluating the helpfulness of online reviews, i.e., whether users perceive a negative review to be more helpful than a positive review. An analysis of 7659 book reviews from Amazon.co.uk shows that a negativity bias disapp...
Conference Paper
In this paper we describe an ontology design process which will introduce the steps and mechanisms required in order to create and develop an ontology which will be able to represent and describe the contents and attributes of hysteroscopy images, as well as their relationships, thus providing a useful ground for the development of tools related wi...
Article
The purpose of this study is to define a bibliometric indicator of the scientific impact of a journal, which combines objectivity with the ability to bridge many different bibliometric factors and in particular the side factors presented along with celebrated ISI impact factor. The particular goal is to determine a standard threshold value in which...
Article
Full-text available
In this paper we introduce a method for Web page-ranking, based on computational geometry to evaluate and test by examples, order relationships among web pages belonging to different knowledge domains. The goal is, through an organising procedure, to learn from these examples a real-valued ranking function that induces ranking via a convexity featu...
Conference Paper
Full-text available
Online product reviews is an important advantage for consumers of experience goods in online marketplaces and act as a useful source of informa- tion during the purchase of a good. Furthermore in some online marketplaces consumers have the opportunity to evaluate how helpful a review was by using a binary evaluation interface provided by the online...
Article
Yahoo!Answers operates a question-answering community of users who post questions and receive answers on various topics. In this paper we examine the effect of activity on service posture (measured by volume and time) as expressed by user contributed effort and user received benefit in an online community facilitated by members of the Yahoo!Answers...
Article
Full-text available
Online product reviews are an important resource for consumers in online marketplaces because they provide a useful source of support information during the purchase of goods. Furthermore, in some online marketplaces consumers have the opportunity to evaluate the usefulness of a review by using a binary evaluation interface provided by the online m...
Conference Paper
This paper discusses ways of navigating online contact networks -networks of social connections defined under a relational context -on a way that can provide more meaningful information to those that use them. We use the concept of social distance to address the different levels of social information and express the subjective vagueness in social t...
Article
Full-text available
Purpose – The purpose of this research is to address the need for a definition of metadata descriptors for use in enhancing the accuracy of bibliometric instruments of scholarly evaluation, such as the impact factor. Design/methodology/approach – A semantic vocabulary – COAP – is constructed, deployed on top of the Resource Description Framework (R...
Article
Full-text available
Introduction It has become conventional wisdom that the availability of scholar related information available on the World Wide Web has been dramatically increased. At the same time the Web becomes the main medium of publication and distribution of information. The results of surveys lead us to the understanding, improvement and the appropriate exp...
Chapter
Full-text available
This chapter elaborates on a twofold approach on models of web search engine retrieval and more specifically the way information resources are ranked in the query results. In particular, current models of information retrieval are blind to the social context that surrounds information resources thus do not consider the trustworthiness of their auth...
Conference Paper
This paper tackles with the background theory and the typology of incentives that characterize behavior in online social interactions. Online social interactions are the major element of activity in online communities. Social network theory and in particular the strength of weak ties hypothesis can provide an analytical framework for studying them....
Chapter
This chapter discusses the integration of information retrieval information from two sources: a social network and a document reference network, for enhancing reference based search engine rankings. In particular, current models of information retrieval are blind to the social context that surrounds information resources thus do not consider the tr...