Evaluating the effectiveness of explanations for recommender systems : Methodological issues and empirical studies on the impact of personalization

Peer reviewedPostprin

Fast matrix computations for pair-wise and column-wise commute times and Katz scores

We first explore methods for approximating the commute time and Katz score between a pair of nodes. These methods are based on the approach of matrices, moments, and quadrature developed in the numerical linear algebra community. They rely on the Lanczos process and provide upper and lower bounds on an estimate of the pair-wise scores. We also explore methods to approximate the commute times and Katz scores from a node to all other nodes in the graph. Here, our approach for the commute times is based on a variation of the conjugate gradient algorithm, and it provides an estimate of all the diagonals of the inverse of a matrix. Our technique for the Katz scores is based on exploiting an empirical localization property of the Katz matrix. We adopt algorithms used for personalized PageRank computing to these Katz scores and theoretically show that this approach is convergent. We evaluate these methods on 17 real world graphs ranging in size from 1000 to 1,000,000 nodes. Our results show that our pair-wise commute time method and column-wise Katz algorithm both have attractive theoretical properties and empirical performance.Comment: 35 pages, journal version of http://dx.doi.org/10.1007/978-3-642-18009-5_13 which has been submitted for publication. Please see http://www.cs.purdue.edu/homes/dgleich/publications/2011/codes/fast-katz/ for supplemental code

Patenting and licensing of university research: promoting innovation or undermining academic values?

Since the 1980s in the US and the 1990s in Europe, patenting and licensing activities by universities have massively increased. This is strongly encouraged by governments throughout the Western world. Many regard academic patenting as essential to achieve 'knowledge transfer' from academia to industry. This trend has far-reaching consequences for access to the fruits of academic research and so the question arises whether the current policies are indeed promoting innovation or whether they are instead a symptom of a pro-intellectual property (IP) culture which is blind to adverse effects. Addressing this question requires both empirical analysis (how real is the link between academic patenting and licensing and 'development' of academic research by industry?) and normative assessment (which justifications are given for the current policies and to what extent do they threaten important academic values?). After illustrating the major rise of academic patenting and licensing in the US and Europe and commenting on the increasing trend of 'upstream' patenting and the focus on exclusive as opposed to non-exclusive licences, this paper will discuss five negative effects of these trends. Subsequently, the question as to why policymakers seem to ignore these adverse effects will be addressed. Finally, a number of proposals for improving university policies will be made

Privacy by Design: From Technologies to Architectures (Position Paper)

Existing work on privacy by design mostly focus on technologies rather than methodologies and on components rather than architectures. In this paper, we advocate the idea that privacy by design should also be addressed at the architectural level and be associated with suitable methodologies. Among other benefits, architectural descriptions enable a more systematic exploration of the design space. In addition, because privacy is intrinsically a complex notion that can be in tension with other requirements, we believe that formal methods should play a key role in this area. After presenting our position, we provide some hints on how our approach can turn into practice based on ongoing work on a privacy by design environment

"It's a can of worms": understanding primary care practitioners' behaviours in relation to HPV using the Theoretical Domains Framework

Background: The relationship between infection with high-risk human papillomavirus (HPV) and cervical cancer is transforming cervical cancer prevention. HPV tests and vaccinations have recently become available. In Ireland, as elsewhere, primary care practitioners play a key role in prevention. ATHENS (A Trial of HPV Education and Support) aims to develop a theorybased intervention to support primary care practitioners in their HPV-related practice. This study, the first step in the intervention development process, aimed to: identify HPV-related clinical behaviours that the intervention will target; clarify general practitioners’ (GPs’) and practice nurses’ roles and responsibilities; and determine factors that potentially influence clinical behaviour. A secondary objective was to informally assess the utility of the Theoretical Domains Framework (TDF) in understanding clinical behaviours in an area with an evolving evidence-base. Methods: In-depth semi-structured telephone interviews were conducted with GPs and practice nurses. The topic guide, which contained open questions and HPV-related clinical scenarios, was developed through literature review and clinical experience. Interview transcripts were content-analysed using the TDF as the coding framework. Results: 19 GPs and 14 practice nurses were interviewed. The major HPV-related clinical behaviours were: initiating a discussion about HPV infection with female patients; offering/recommending HPV vaccination to appropriate patients; and answering patients’ questions about HPV testing. While the responsibility for taking smears was considered a female role, both male and female practitioners dealt with HPV-related issues. All 12 theoretical domains arose in relation to HPV infection; the domains judged to be most important were: knowledge, emotion, social influences, beliefs about capabilities and beliefs about consequences. Eleven domains emerged in relation to HPV vaccination, with beliefs about consequences, social influences, knowledge and environmental context and resources judged to be the most important. Nine domains were relevant to HPV testing, with knowledge and beliefs about capabilities judged to be the most important. Conclusions: The findings confirm the need for an intervention to support primary care practitioners around HPV and suggest it should target a range of theoretical domains. The TDF proved valuable in analysing qualitative data collected using a topic guide not specifically designed to capture TDF domains and understanding clinical behaviours in an area with an evolving evidence-base

Aphasia and Spirituality: the feasibility of assessment and intervention using WELLHEAD and SHALOM

Background: Spiritual aspects of aphasia rehabilitation are poorly understood, though identified within adjustment. Existing spiritual health assessments have not been used with people with aphasia, and no structured program to facilitate intervention has been documented, despite acknowledgments that spirituality is important in health and wellbeing and distinct from quality of life and mental health. Aims: Mixed methods were used to investigate the accessibility and acceptability of a spiritual health assessment (SHALOM) and WELLHEAD, a toolkit originated by Mumby for spiritual health assessment and intervention, using the religiously neutral dimensions of ‘WIDE, LONG, HIGH and DEEP’. Method: A Steering group (five people with aphasia) shaped the feasibility study cyclically, agreeing that ‘Meaning and purpose’ defined spirituality, and selecting SHALOM. WELLHEAD was modified collaboratively with the Steering group and Hospital Chaplain. A convenience sample of 10 people with aphasia (discharged from therapy) represented diverse aphasia histories, ages and religious backgrounds. Participants completed a two-hour session using SHALOM, the WELLHEAD toolkit and a feedback questionnaire within video-recorded interviews. Quantitative results from all three components were integrated with a qualitative thematic analysis in NVivo 11 including numerical and descriptive summaries verified by the participants, feedback interview transcripts and field notes with reflections. The thematic analysis was systematically and independently verified by a co-researcher. Feedback from participants was further verified by incorporating their comments from reviewing the overall findings. Results: Quantitative and qualitative feedback evaluated the materials positively. Thematic analysis provided evidence of the accessibility, acceptability and positive impact of WELLHEAD irrespective of aphasia severity or aetiology, and religious background. ‘Belief’, ‘Faith’ and ‘Religion’ were disambiguated. SHALOM was also linguistically and cognitively accessible with communication support even for those with severe aphasia. Scores from WELLHEAD and SHALOM were compared and set into the context of wider standardisation of SHALOM, providing the first evidence of spiritual health measures in participants with aphasia. Conclusions: This preliminary work lays foundations for spiritual assessment and intervention in aphasia. Establishing the psychometric properties of SHALOM and WELLHEAD in people with aphasia requires a larger sample. Additional study of intervention is proposed, with clear potential for wider application of WELLHEAD in diverse settings and populations

Journeying with Morrie: challenging notions of professional delivery of spiritual care at the end of life

The spiritual welfare of dying people has in recent years moved from the domain of religion to become the concern of health care professionals, particularly as part of the ideal of holism that underpins palliative care. Professional delivery of spiritual care incorporates the features of assessment, control and treatment which may involve varying degrees of intrusion into the patient's deeply personal inner self. Using a case study approach, this article explores meanings of spirituality and understandings of what is meant by the term 'spiritual care'. It argues that biographical and community approaches to spiritual care of dying people may be more congruent with the concept of the 'whole person' because this support is rooted in an intimate contextual knowledge of the dying person by the caregiver. This challenges the dominant discourses of professional expertise to embrace informal personal and collective competence in this important aspect of end of life care

The Williams Scale of Attitude toward Paganism: development and application among British Pagans

This article builds on the tradition of attitudinal measures of religiosity established by Leslie Francis and colleagues with the Francis Scale of Attitude toward Christianity (and reflected in the Sahin-Francis Scale of Attitude toward Islam, the Katz-Francis Scale of Attitude toward Judaism, and the Santosh-Francis Scale of Attitude toward Hinduism) by introducing a new measure to assess the attitudinal disposition of Pagans. A battery of items was completed by 75 members of a Pagan Summer Camp. These items were reduced to produce a 21-item scale that measured aspects of Paganism concerned with: the God/Goddess, worshipping, prayer, and coven. The scale recorded an alpha coefficient of 0.93. Construct validity of the Williams Scale of Attitude toward Paganism was demonstrated by the clear association with measures of participation in private rituals

Creative methods: problematics for inquiry and pedagogy in health and social care

This article provides an overview of initial discussions emerging from the Creative Methods Network, an informal organisation concerned with the use of the creative arts in research, teaching and practice in health and social care. Key issues are presented and contextualised with regard to the current conditions in which health and social care research and education is practised. Our own discussions have come to question the seeming dominance of governance within professional education programmes in which there is a primary focus on developing technical skill and capacity. Such governance often extends itself to the measurement of the implementation of these technical skills and this is set against concerns about the absence of creativity and the humanities in the educational programmes of caring for human beings. Consequently, the article reflects a view that the use of the creative arts and humanities in the education of the human caring professions is being eroded away in favour of technical-rational reasoning. It is argued that this then presents an important problem manifested in an emphasis on established and quantifiable knowledge transfer which inhibits other forms of knowledge generation. For the purposes of this discussion we have viewed this problem through the lenses offered by Foucault and Bourdieu