A NOTE ON NONLINEARITY BIAS AND DICHOTOMOUS CHOICE CVM: IMPLICATIONS FOR AGGREGATE BENEFITS ESTIMATION

It is a generally known statistical fact that the mean of a nonlinear function of a set of random variables is not equivalent to the function evaluated at the means of the variables. However, in dichotomous choice contingent valuation studies a common practice is to calculate an overall mean (or median) by integrating over offer space (numerically or analytically) an estimated logit or probit function in which sample mean values for the concomitant variables are used. We demonstrate this procedure to be incorrect and we statically test the procedure against the correct method for nonlinear models. Using data resulting in a well-behaved logit model, we reject the hypothesis of congruence between the two means. Such a finding should be considered in future single response dichotomous choice CVM studies, particularly when aggregation is of interest.Research Methods/ Statistical Methods,

The Clarendon Press Text of Livy Titi Livi Ab Vrbe Condita recognoverunt et adnotatione critica instruxerunt R. S. Conway et C. F. Walters, Tom. i., Libri i.-v. 1 vol. Cr. 8vo. Pp. xl + 485. Clarendon Press, Oxford, 1914. 4s. cloth ; 3s. 6d. paper ; 5s. 6d. India paper.

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EFFECTS OF RESERVOIR AQUATIC PLANT MANAGEMENT ON RECREATIONAL EXPENDITURES AND REGIONAL ECONOMIC ACTIVITY

Exotic aquatic plant management is a major concern for public reservoir management in many regions of the United States. A study was conducted to measure the effects of alternative aquatic plant management strategies on recreational expenditures and regional economic activity. The study areas was Lake Guntersville, Alabama, and the local economy surrounding the lake. Lake Guntersville is one of the largest reservoirs in the Tennessee Valley Authority system. Results suggested the relatively moderate levels of aquatic plant control are associated with the highest levels of recreation-related economic effects on the economy surrounding Lake Guntersville.Aquatic plants, Input-output analysis, Public reservoir management, Recreational expenditures, Regional economic activity, Resource /Energy Economics and Policy,

UK Waste Sector COVID-19 Response and Resilience Report

This is the final version. Available from the Covid-19 Waste Project website via the link in this recordFrom the beginning of March 2020, when COVID-19 was confirmed as a pandemic by World Health Organization, many sectors across the UK had to respond to an uncertain and rapidly evolving situation, including the introduction of a UK-wide lockdown on the 23rd March. The resources and waste sector, as a frontline service that protects both human health and the environment, had to maintain operations and this necessitated contingency planning on an unforeseen scale, with significant cross-sector engagement and collaboration, and new methods of working. To capture some of the learning from the first six months after the start of the UK-wide lockdown, the Chartered Institution of Wastes Management (CIWM) has been working in partnership with the University of Exeter to undertake a UK wide research exercise with multiple stakeholders across the resources and waste management sector. This forms part of a wider project led by the University of Exeter and funded by the Economic and Social Research Council, as part of UK Research and Innovation’s Rapid Response to COVID-19. The study used a qualitative social science methodology, undertaking a series of workshops and in-depth interviews with representatives from across the sector. Participants included national and local government officers, environmental regulators, and local authority and private sector waste professionals. Held in October 2020, this stakeholder engagement exercise explored immediate challenges, winter preparedness, and what is needed to support longer term sector resilience. It should be noted that this report is based on the discussions and feedback from sector representatives who generously took part. It is not designed to be a comprehensive assessment or account of the sector’s response but rather a snapshot in time during Autumn 2020 as the UK readied itself for the likelihood of a second wave of COVID-19 through the winter months. Much of the data and evidence that will be needed for a thorough assessment of the full impact of the pandemic on the sector is not yet available, but this report is designed to be a first step in the process to stimulate further reflection and learning.Economic and Social Research Council (ESRC

A comparative evaluation of modern English corpus grammatical annotation schemes

Many English Corpus Linguistics projects reported in ICAME Journal and elsewhere involve grammatical analysis or tagging of English texts (eg Atwell 1983, Leech et al 1983, Booth 1985, Owen 1987, Souter 1989a, O’Donoghue 1991, Belmore 1991, Kytö and Voutilainen 1995, Aarts 1996, Qiao and Huang 1998). Each new project has to review existing tagging schemes, and decide which to adopt and/or adapt. The AMALGAM project can help in this decision, by providing descriptions and analyses of a range of tagging schemes, and an internet-based service for researchers to try out the range of tagging schemes on their own data. The project AMALGAM (Automatic Mapping Among Lexico-Grammatical Annotation Models) explored a range of Part-of-Speech tagsets and phrase structure parsing schemes used in modern English corpus-based research. The PoS-tagging schemes include: Brown (Greene and Rubin 1981), LOB (Atwell 1982, Johansson et al 1986), Parts (man 1986), SEC (Taylor and Knowles 1988), POW (Souter 1989b), UPenn (Santorini 1990), LLC (Eeg-Olofsson 1991), ICE (Greenbaum 1993), and BNC (Garside 1996). The parsing schemes include some which have been used for hand annotation of corpora or manual post-editing of automatic parsers, and others which are unedited output of a parsing program. Project deliverables include: – a detailed description of each PoS-tagging scheme, at a comparable level of detail. This includes a list of PoS-tags with descriptions and example uses from the source Corpus. The description of the use of PoS-tags is also illustrated in a multi-tagged corpus: a set of sample texts PoS-tagged in parallel with each PoS-tagset (and proofread by experts), for comparative studies – an analysis of the different lexical tokenization rules used in the source Corpora, to arrive at a ‘Corpus-neutral’ tokenization scheme (and consequent adjustments to the PoS-tagsets in our study to accept modified tokenization) – an implementation of each PoS-tagset in conjunction with our standardised tokenizer, as a family of PoS-taggers, one for each PoS-tagset – a method for ‘PoS-tagset conversion’, taking a text tagged according to one PoS-tagset and outputting the text annotated with another PoS-tagset – a sample of texts parsed according to a range a parsing schemes: a Multi-Treebank resource for comparative studies – an Internet service allowing researchers worldwide free access to the above resources, including a simple email-based method for PoS-tagging any English text with any or all PoS-tagset(s)

Efficacy and safety of a subacromial continuous ropivacaine infusion for post-operative pain management following arthroscopic rotator cuff surgery: A protocol for a randomised double-blind placebo-controlled trial

<p>Abstract</p> <p>Background</p> <p>Major shoulder surgery often results in severe post-operative pain and a variety of interventions have been developed in an attempt to address this. The continuous slow infusion of a local anaesthetic directly into the operative site has recently gained popularity but it is expensive and as yet there is little conclusive evidence that it provides additional benefits over other methods of post-operative pain management.</p> <p>Methods/Design</p> <p>This will be a randomised, placebo-controlled trial involving 158 participants. Following diagnostic arthroscopy, all participants will undergo arthroscopic subacromial decompression with or without rotator cuff repair, all operations performed by a single surgeon. Participants, the surgeon, nurses caring for the patients and outcome assessors will be blinded to treatment allocation. All participants will receive a pre-incision bolus injection of 20 mls of ropivacaine 1% into the shoulder and an intra-operative intravenous bolus of parecoxib 40 mg. Using concealed allocation participants will be randomly assigned to active treatment (local anaesthetic ropivacaine 0.75%) or placebo (normal saline) administered continuously into the subacromial space by an elastomeric pump at 5 mls per hour post-operatively. Patient controlled opioid analgesia and oral analgesics will be available for breakthrough pain. Outcome assessment will be at 15, 30 and 60 minutes, 2, 4, 8, 12, 18 and 24 hours, and 2 or 4 months for decompression or decompression plus repair respectively.</p> <p>The primary end point will be average pain at rest over the first 12-hour post-operative period on a verbal analogue pain score. Secondary end points will be average pain at rest over the second 12-hour post-operative period, maximal pain at rest over the first and second 12-hour periods, amount of rescue medication used, length of inpatient stay and incidence of post-operative adhesive capsulitis.</p> <p>Discussion</p> <p>The results of this trial will contribute to evidence-based recommendations for the effectiveness of pain management modalities following arthroscopic rotator cuff surgery. If the local anaesthetic pain-buster provides no additional benefits over placebo then valuable resources can be put to better use in other ways.</p> <p>Trial registration</p> <p>Australian Clinical Trials Register Number ACTR12606000195550</p