A reversible infinite HMM using normalised random measures

We present a nonparametric prior over reversible Markov chains. We use completely random measures, specifically gamma processes, to construct a countably infinite graph with weighted edges. By enforcing symmetry to make the edges undirected we define a prior over random walks on graphs that results in a reversible Markov chain. The resulting prior over infinite transition matrices is closely related to the hierarchical Dirichlet process but enforces reversibility. A reinforcement scheme has recently been proposed with similar properties, but the de Finetti measure is not well characterised. We take the alternative approach of explicitly constructing the mixing measure, which allows more straightforward and efficient inference at the cost of no longer having a closed form predictive distribution. We use our process to construct a reversible infinite HMM which we apply to two real datasets, one from epigenomics and one ion channel recording.Comment: 9 pages, 6 figure

How helpful is NHS Direct? Postal survey of callers

NHS Direct, the new 24 hour telephone advice line staffed by nurses, was established to “provide easier and faster information for people about health, illness and the NHS so that they are better able to care for themselves and their families.” In March 1998, three first wave sites started in Lancashire, Milton Keynes, and Northumbria. As part of an extensive evaluation of this new service, we surveyed callers to determine how helpful they found the advice offered

Integrating community pharmacy and NHS Direct - pharmacists' views

AIM:To establish the views of community pharmacists on NHS Direct and its forthcoming integration with community pharmacy. DESIGN: Postal questionnaire survey. SUBJECTS AND SETTING: Pharmacists working in community pharmacies within the area of the NHS Direct Pharmacy pilot scheme - Essex, Barking and Havering. RESULTS: The response rate to the postal survey was 72% (263/364). Most pharmacies were generally supportive of NHS Direct (80%) and the pharmacy scheme in principle (83%), although their experience of the scheme in practice was limited. Perhaps because of this, the majority of pharmacists were unsure as to whether NHS Direct was referring appropriately, or whether the pharmacy would be able to meet the needs of patients without further referral. Almost half believed that patients referred by NHS Direct should be seen in a quiet area, away from the counter. Over two-thirds of pharmacists were willing to accommodate an NHS Direct information point in their pharmacy, although space was an issue. CONCLUSION: Overall the results of this study suggested that community pharmacists welcome their increasing involvement in the developing immediate care system. As the Government commitment in the NHS plan to integrate community pharmacy with NHS Direct becomes a reality across England and Wales over coming months the implications for pharmacists, in terms of workload and the adequacy of premises, will become clearer. Careful audit of the operation of the scheme will be essential

Enhancing student learning with case-based learning objects in a problem-based learning context: the views of social work students in Scotland and Canada

This paper summarizes the results of an evaluation of students' perspectives comparing learning from a multimedia case-based learning object with learning from text-based case studies. A secondary goal of the study was to test the reusability of the learning object in different instructional contexts. The learning object was deployed in the context of a problem-based learning approach to teaching social work students in three different courses in two different countries: Scotland (N=39) and Canada (N=57). Students completed a structured survey form including a series of statements using a five point Likert scale to quantify their views of the different case types (text-based and multimedia). Results indicate strong support for the use of multimedia case scenarios in social work education. Students felt their learning was enhanced using multimedia case studies compared to text-based case studies. A number of benefits, disadvantages and recommendations were identified that will help guide the future development, (re)use, and exchange of digitized learning resources in social work education