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Update in Gynecology and Obstetrics: reviews and databases

CONDE, Delio Marques; AMARAL, Waldemar Naves; PINTO-NETO, Aarao Mendes; ANDRADE, Jurandyr Moreira de
Fonte: SPRINGER HEIDELBERG Publicador: SPRINGER HEIDELBERG
Tipo: Artigo de Revista Científica
ENG
Relevância na Pesquisa
36.26%
There is a considerable body of new information on Gynecology and Obstetrics. To aid in keeping gynecologists updated, renowned periodicals publish review articles. Review articles enable the reader to obtain the best evidence for clinical or research issues from several individual articles. This enables the professional to make clinical decisions in the light of current knowledge. The different types of reviews and database that may be used for the elaboration of reviews are discussed in the present article. It is suggested that future reviews on Gynecology and Obstetrics include articles published in other idioms apart from English and that a larger number of database is researched. Thus, reviews will be not only more inclusive but more representative of the international literature.

A influência dos reviews sobre o comportamento de compra do consumidor portoalegrense de hotéis

Schmidt, Lauren Elisa
Fonte: Universidade Federal do Rio Grande do Sul Publicador: Universidade Federal do Rio Grande do Sul
Tipo: Trabalho de Conclusão de Curso Formato: application/pdf
POR
Relevância na Pesquisa
36.29%
Considerando o surgimento da internet como meio de disseminação de informações e o papel do marketing boca-a-boca na tomada de decisão de compra do consumidor, este trabalho tem como tema principal investigar a influência da leitura de reviews disponíveis na internet nos consumidores porto-alegrenses de hotéis e demais tipos de estabelecimentos de hospedagem. Para tal, foi realizado um estudo exploratório de abordagem qualitativa envolvendo a coleta de dados acerca do tema e de outros temas relacionados, os quais pertencem à produção científica elaborada acerca do comportamento do consumidor, bem como a realização de entrevistas semiestruturadas com leitores recorrentes de resenhas online sobre hotéis, como meio de busca de alternativas de hospedagem. Os resultados analisados apontam para a tendência de que os consumidores realmente são influenciados pelo conteúdo produzido de forma online por outros indivíduos que desfrutaram do serviço, e que, em decorrência disto, são capazes de atribuir variados aspectos positivos à ferramenta. Também o fato de, na opinião dos participantes da pesquisa, os reviews retratarem de forma fiel a realidade do estabelecimento pesquisado pode ser um indicativo de que estes confiem nas informações disponibilizadas através da internet...

An AMSTAR assessment of the methodological quality of systematic reviews of oral healthcare interventions published in the Journal of Applied Oral Science (JAOS)

Sequeira-Byron,Patrick; Fedorowicz,Zbys; Jagannath,Vanitha A.; Sharif,Mohammad Owaise
Fonte: Faculdade De Odontologia De Bauru - USP Publicador: Faculdade De Odontologia De Bauru - USP
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/10/2011 EN
Relevância na Pesquisa
36.36%
BACKGROUND: Systematic reviews are not an assembly of anecdotes but a distillation of current best available evidence on a particular topic and as such have an important role to play in evidence-based healthcare. A substantial proportion of these systematic reviews focus on interventions, and are able to provide clinicians with the opportunity to understand and translate the best available evidence on the effects of these healthcare interventions into clinical practice. The importance of systematic reviews in summarising and identifying the gaps in evidence which might inform new research initiatives is also widely acknowledged. Their potential impact on practice and research makes their methodological quality especially important as it may directly infuence their utility for clinicians, patients and policy makers. The objectives of this study were to identify systematic reviews of oral healthcare interventions published in the Journal of Applied Oral Science (JAOS) and to evaluate their methodological quality using the evaluation tool, AMSTAR. METHODS: Potentially eligible systematic reviews in JAOS were identifed through an electronic search of the Scientific Electronic Library Online (SciELO). Details of the relevant aspects of methodology as reported in these systematic reviews were extracted from the full text publications. Methodological quality was assessed independently by two reviewers using the AMSTAR questionnaire. RESULTS: Five systematic reviews were identifed...

Medication reviews

Blenkinsopp, Alison; Bond, Christine; Raynor, David K
Fonte: Blackwell Science Inc Publicador: Blackwell Science Inc
Tipo: Artigo de Revista Científica
EN
Relevância na Pesquisa
36.26%
Recent years have seen a formalization of medication review by pharmacists in all settings of care. This article describes the different types of medication review provided in primary care in the UK National Health Service (NHS), summarizes the evidence of effectiveness and considers how such reviews might develop in the future. Medication review is, at heart, a diagnostic intervention which aims to identify problems for action by the prescriber, the clinican conducting the review, the patient or all three but can also be regarded as an educational intervention to support patient knowledge and adherence. There is good evidence that medication review improves process outcomes of prescribing including reduced polypharmacy, use of more appropriate medicines formulation and more appropriate choice of medicine. When ‘harder’ outcome measures have been included, such as hospitalizations or mortality in elderly patients, available evidence indicates that whilst interventions could improve knowledge and adherence they did not reduce mortality or hospital admissions with one study showing an increase in hospital admissions. Robust health economic studies of medication reviews remain rare. However a review of cost-effectiveness analyses of medication reviews found no studies in which the cost of the intervention was greater than the benefit. The value of medication reviews is now generally accepted despite lack of robust research evidence consistently demonstrating cost or clinical effectiveness compared with traditional care. Medication reviews can be more effectively deployed in the future by targeting...

Contribution of Systematic Reviews to Management Decisions

COOK, CARLY N; POSSINGHAM, HUGH P; FULLER, RICHARD A
Fonte: BlackWell Publishing Ltd Publicador: BlackWell Publishing Ltd
Tipo: Artigo de Revista Científica
EN
Relevância na Pesquisa
36.35%
Systematic reviews comprehensively summarize evidence about the effectiveness of conservation interventions. We investigated the contribution to management decisions made by this growing body of literature. We identified 43 systematic reviews of conservation evidence, 23 of which drew some concrete conclusions relevant to management. Most reviews addressed conservation interventions relevant to policy decisions; only 35% considered practical on-the-ground management interventions. The majority of reviews covered only a small fraction of the geographic and taxonomic breadth they aimed to address (median = 13% of relevant countries and 16% of relevant taxa). The likelihood that reviews contained at least some implications for management tended to increase as geographic coverage increased and to decline as taxonomic breadth increased. These results suggest the breadth of a systematic review requires careful consideration. Reviews identified a mean of 312 relevant primary studies but excluded 88% of these because of deficiencies in design or a failure to meet other inclusion criteria. Reviews summarized on average 284 data sets and 112 years of research activity, yet the likelihood that their results had at least some implications for management did not increase as the amount of primary research summarized increased. In some cases...

Systematic reviews of nursing research : development of a conceptual framework

Evans, David
Fonte: Universidade de Adelaide Publicador: Universidade de Adelaide
Tipo: Tese de Doutorado Formato: 1698187 bytes; 2089561 bytes; 2351898 bytes; 4730314 bytes; 2553186 bytes; 241159 bytes; application/pdf; application/pdf; application/pdf; application/pdf; application/pdf; application/pdf
Publicado em //2001 EN
Relevância na Pesquisa
36.33%
Background : - The past two decades has seen an increasing emphasis placed on basing health care on the best available evidence. However, existing research has come under increasing scrutiny, which suggests its quality was often poor. This problem has been exacerbated by the ever increasing volume of health care literature. To address these difficulties systematic reviews have emerged as one of the most important ways by which research is summarised and communicated to its end-users. However, as these reviews have been primarily concerned with effectiveness, they have focused almost exclusively on randomised controlled trials. As a result, systematic reviews have excluded much of the research of nurses. Purpose : - The purpose of this study was to develop a process to systematically collect, appraise, summarise and synthesise the findings of a range of different types of research. Conceptual Framework : - To aid in the development of these expanded review methods, a conceptual framework was developed that addressed effectiveness, appropriateness and feasibility. Method : - A search of the literature was undertaken to identify published reviews of different types of research, and discussions in the health care literature related to the conduct of research reviews. These reviews and discussion papers served as the basis for developing the expanded review methods. Evaluation : - To evaluate the expanded review methods...

Identifying the fundamentals of care within Cochrane systematic reviews: The role of the Cochrane nursing care field fundamentals of care node

Kitson, A.; Robertson-Malt, S.; Conroy, T.
Fonte: Blackwell Science Asia Pty Ltd Publicador: Blackwell Science Asia Pty Ltd
Tipo: Artigo de Revista Científica
Publicado em //2013 EN
Relevância na Pesquisa
36.29%
The role of the Fundamentals of Care (FoC) Node within the Cochrane Nursing Care Field (CNCF) is to identify universal aspects of patient care as they relate to and potentially affect the application of the results of systematic reviews. The CNCF was established to provide a nursing perspective of Cochrane reviews and to promote their dissemination and uptake. The core functions of the CNCF include identifying topics for nursing care not currently addressed by Cochrane Reviews, raising awareness of the Cochrane Collaboration and the resources it has that supports the delivery of nursing care and the dissemination of relevant reviews to the nursing care community. We outline how volunteers with an interest in the FoC can work to identify care-related aspects for specific clinical reviews. This article describes the development of a tool designed to guide the review of a Cochrane Systematic Review from the vantage of the FoC. The FoC Node is seeking volunteers to undertake this review work, and we have outlined the steps used to do this. We also show how using the FoC Template can inform the tagging and classifying of existing reviews within the Cochrane library.; Alison Kitson, Suzi Robertson-Malt, Tiffany Conroy

The methodological quality of systematic reviews comparing intravitreal bevacizumab and alternates for neovascular age related macular degeneration: a systematic review of reviews

George Gunapal, P.P.; DeCastro Molina, J.; Heng, B.
Fonte: Medknow Publicador: Medknow
Tipo: Artigo de Revista Científica
Publicado em //2014 EN
Relevância na Pesquisa
36.36%
Objective: To systematically collate and evaluate the evidence from recent SRs of bevacizumab for neo-vascular age related macular degeneration. Materials and Methods: Literature searches were carried out in Medline, Embase, Cochrane databases for all systematic reviews (SRs) on the effectiveness of bevacizumab for neo-vascular age related macular degeneration, published between 2000 and 2013. Titles and abstracts were assessed against the inclusion/exclusion criteria using Joanna Briggs Institute (JBI) study eligibility form. Data was extracted using the JBI data extraction form. The quality of the SRs was assessed using JBI critical appraisal checklist for SRs. Decisions on study eligibility and quality were made by two reviewers; any disagreements were resolved by discussion. Results: Nine relevant reviews were identified from 30 citations, of which 5 reviews fulfilled the review's inclusion criteria. All 5 reviews showed bevacizumab to be effective for neovascular AMD in the short-term when used alone or in combination with PDT or Pegaptanib. The average quality score of the reviews was 7; 95% confidence interval 6.2 to 7.8 (maximum possible quality score is 10). The selection and publication bias were not addressed in all included reviews. Three-fifth of the reviews had a quality score of 7 or lower...

Cochrane systematic reviews in the field of addiction: what's there and what should be

Amato, L.; Davoli, M.; Vecchi, S.; Ali, R.; Farrell, M.; Faggiano, F.; Foxcroft, D.; Ling, W.; Minozzi, S.; Chengzheng, Z.
Fonte: Elsevier Sci Ireland Ltd Publicador: Elsevier Sci Ireland Ltd
Tipo: Artigo de Revista Científica
Publicado em //2011 EN
Relevância na Pesquisa
36.29%
The Cochrane Drugs and Alcohol Group aims to produce, update, and disseminate systematic reviews on the prevention, treatment, and rehabilitation of problematic drug and alcohol use. The objective of the present paper was to summarize the main characteristics of the published systematic reviews in the field of drug and alcohol dependence, in terms of the topics covered, methods used to produce the reviews, and available evidence. By January 2010, the Group had published 52 reviews with 694 primary studies included out of 2059 studies considered for inclusion. Of these publications, 44% were published in 12 journals, including Drug and Alcohol Dependence (11%) with the highest number of publications, and 68% were conducted in North America. The majority of included studies (90%) were randomized controlled trials. Evaluating their methodological quality, we found that allocation concealment methods were not properly described in the majority of studies (18% adequate, 73% unclear, 9% inadequate). The percentage of interventions shown to be beneficial varied according to the substance considered: 42% for opioids, 37% for alcohol, 14% for psychostimulants, 7% for polydrugs, and 33% for prevention. Furthermore, 75% of the reviews provided specific information on further research needs. Cochrane reviews provide information on the most effective treatments...

Public Expenditure Reviews : Progress and Potential; Estudios del gasto publico: logros y posibilidades

Swaroop, Vinaya
Fonte: World Bank, Washington, DC Publicador: World Bank, Washington, DC
Tipo: Publications & Research :: Brief; Publications & Research
ENGLISH
Relevância na Pesquisa
36.31%
The note reviews the potential of public expenditure reviews as objective analysis of a country's public spending issues, and in advancing the development agenda in the Bank's client countries. It examines the experiences with these reviews, setting the approach for improving them, finding that: most public expenditure reviews define the public sector deficit as the central government deficit, while relevant macroeconomic variables are being ignored; those reviews do not examine the rationale for public intervention, as an analysis on the efficiency of the public budget allocation; do not integrate capital, and recurrent expenditures, thus sidesteps the issue of future recurrent cost implications of the capital budget, introducing uncertainty regarding the sustainability of policies, and projects; and, only a minimal percentage of public expenditure reviews, adequately focus on institutional issues, such as budget management, or incentives in the public sector. The note suggests questioning the exercise of these reviews...

On The Link Between Mobile App Quality And User Reviews

Khalid, Hammad
Fonte: Quens University Publicador: Quens University
Tipo: Tese de Doutorado
EN; EN
Relevância na Pesquisa
36.35%
Mobile app stores contain millions of apps which users can download and install on their smart phones. Each app has a page in the mobile app store that includes app's description, a download link for the app, and a space for users to review the app. Each review has a 1-5 star rating and a review-comment. Unlike desktop and server side-software where direct user feedback about software quality was difficult to acquire, app developers now have access to the user's perspective of their apps via the reviews. Since apps with high-rating reviews are downloaded statistically significantly more than apps with low-rating reviews, the insights from studying these reviews are very important. Thus in this thesis, we analyze hundreds of thousands of reviews of Android and iOS apps to help developers understand the relationship between app quality, and the feedback in reviews. In this thesis, we find that low-rated reviews of apps contain 12 different complaint types which have varying impact and frequencies. The most frequent complaints are about functional errors, feature requests, and app crashes; complaints about privacy, ethical and hidden cost issues receive the worst star ratings. For Android developers struggling with device fragmentation...

Online Reviews e Reserva de Hotéis: Análise dos factores que influenciam a adopção de informação disponibilizada pelas online reviews no site booking.com

Mateus, Fábio
Fonte: Universidade Europeia - Laureate International Universities Publicador: Universidade Europeia - Laureate International Universities
Tipo: Dissertação de Mestrado
Publicado em 23/07/2015 POR
Relevância na Pesquisa
36.31%
Actualmente, fruto da evolução das tecnologias e aplicações relacionadas com a Web 2.0, os consumidores turísticos utilizam cada vez mais a internet como meio para planearem as suas viagens e realizarem as suas reservas de alojamento. O número de reservas de alojamento através da internet tem aumentado de ano para ano. Paralelamente a este acontecimento, as Online Reviews apresentaram um crescimento exponencial, sendo cada vez maior a sua influência no processo de reserva de um alojamento online. Assim, o objectivo da presente investigação assenta numa análise dos factores que influenciam a adopção de informação disponibilizada pelas online reviews no site booking.com. Na metodologia adaptou-se um modelo que analisa a influência que dimensões qualitativas e quantitativas exercem na adopção de informação, tendo sido realizado um questionário online. Para analisar as hipóteses de estudo, foi efectuada uma regressão linear múltipla. Os principais resultados indicam que as dimensões Ranking do Produto, Precisão da Informação, Quantidade de Informação, Valor-agregado e Experiências anteriores exercem influência na adopção de informação das online reviews.; Currently, due to the evolution of technologies and applications related to the Web 2.0...

Fine-grained analysis of aspects, sentiments and types of attitudes in restaurant reviews; Análise de aspectos, sentimentos e tipos de atitude em avaliações sobre restaurantes

Chaves, Marcirio Silveira; Laurel, André; Sacramento, Nélia; Pedron, Cristiane Drebes
Fonte: Universidade do Algarve Publicador: Universidade do Algarve
Tipo: Artigo de Revista Científica
Publicado em //2014 ENG
Relevância na Pesquisa
36.26%
This paper presents a novel approach based on the Appraisal Theory to analyze user-generated, open-ended online restaurant reviews. We selected reviews (N=1100) from restaurants of two Portuguese touristic regions and focus, through content analysis, on the recognition of the main aspects, sentiments and types of attitude mentioned in such reviews. We also measure the interrater agreement on the recognition of the types of attitude. The main findings show that Quality of Food, Staff and Communication, Price and Atmosphere are the most frequent aspects mentioned in the reviews. Positive appreciation is the attitude expressed in most of the sentences. Most of the reviews present a positive evaluation of the restaurants. The interrater agreement among raters on the recognition of the types of attitude ranges from 0.82 to 0.92. Results reveal the main aspects that restaurateurs should take into account to make decisions in order to improve the business as a whole.; Este artigo apresenta uma nova abordagem baseada na Teoria de Avaliação para analisar avaliações online abertas e geradas pelo utilizador sobre restaurantes. Foram selecionadas avaliações (n = 1.100) de restaurantes de duas regiões turísticas portuguesas e focamos, através de análise de conteúdo...

Academic book reviews in English and Spanish: critical comments and rhetorical structure

Moreno, Ana I.; Suárez, Lorena
Fonte: Conselho Superior de Investigações Científicas Publicador: Conselho Superior de Investigações Científicas
Tipo: Capítulo de libro Formato: 35840 bytes; application/msword
ENG
Relevância na Pesquisa
36.32%
Moreno, A.I. & Suárez, L. (forthcoming). Academic book reviews in English and Spanish: critical comments and rhetorical structure, in Hyland, K. and G. Diani (eds). Academic Evaluation: Review Genres in University Settings. Basingstoke, UK: Palgrave-Macmillan.-- Expected publication date: 2009-08-28.; Reproduced with permission of Palgrave Macmillan.; Given the increasing pressure felt by many Spanish scholars to publish in English, writing academic book reviews for an international audience might become a possible strategy to make their names more visible. However, Spanish writers of book reviews of literature might have initial problems with publishing academic book reviews in Anglo-American journals since they have a suspicious tendency to almost exclusively praise the book. This total lack of unbiased objective assessment might have the effect of undermining the reliability and credibility of the reviewer and of the book’s worth, thus resulting in the rejection of the text. In an attempt to further understand the conventions of this genre cross-culturally, the major purpose of the present chapter is to compare how critical attitude towards the book under review is measured out throughout the rhetorical structure of academic book reviews to achieve the genre’s main communicative purpose in each case. The study focuses on two comparable corpora of literary book reviews of literature...

An AMSTAR assessment of the methodological quality of systematic reviews of oral healthcare interventions published in the Journal of Applied Oral Science (JAOS)

Sequeira-Byron, Patrick; Fedorowicz, Zbys; Jagannath, Vanitha A.; Sharif, Mohammad Owaise
Fonte: Universidade de São Paulo. Faculdade de Odontologia de Bauru Publicador: Universidade de São Paulo. Faculdade de Odontologia de Bauru
Tipo: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; Formato: application/pdf
Publicado em 01/10/2011 ENG
Relevância na Pesquisa
36.36%
BACKGROUND: Systematic reviews are not an assembly of anecdotes but a distillation of current best available evidence on a particular topic and as such have an important role to play in evidence-based healthcare. A substantial proportion of these systematic reviews focus on interventions, and are able to provide clinicians with the opportunity to understand and translate the best available evidence on the effects of these healthcare interventions into clinical practice. The importance of systematic reviews in summarising and identifying the gaps in evidence which might inform new research initiatives is also widely acknowledged. Their potential impact on practice and research makes their methodological quality especially important as it may directly infuence their utility for clinicians, patients and policy makers. The objectives of this study were to identify systematic reviews of oral healthcare interventions published in the Journal of Applied Oral Science (JAOS) and to evaluate their methodological quality using the evaluation tool, AMSTAR. METHODS: Potentially eligible systematic reviews in JAOS were identifed through an electronic search of the Scientific Electronic Library Online (SciELO). Details of the relevant aspects of methodology as reported in these systematic reviews were extracted from the full text publications. Methodological quality was assessed independently by two reviewers using the AMSTAR questionnaire. RESULTS: Five systematic reviews were identifed...

The Influence Effect of Critics' Reviews on Foreign and Domestic Movies

Jeon, Jayoung; Jiao, Luxuan
Fonte: Universidade Duke Publicador: Universidade Duke
Publicado em 17/04/2012 EN_US
Relevância na Pesquisa
36.31%
Critics and their reviews provide crucial information for consumers in many “experience goods” markets, and the movie market is one such market. Through their impact on the consumer’s film selection, critics’ reviews influence the first weekend box office performance (the influence effect). We hypothesize that the influence effect of critics’ reviews is different for foreign and domestic movies. Using the U.S. film industry as our empirical setting, we examine the effects of reviews on opening weekend revenues in the U.S. film industry. We find that, when the critics’ assessment of domestic movies is positive, people are discouraged from watching the movie. On the other hand, for foreign movies, the impact of positive reviews is found to be positive. We interpret this result as arising from the different target audiences for foreign and domestic movies. Further analysis of our data supports this hypothesis. We also find that people are more influenced to watch movies when they see multiple reviews than only a few of them. This positive impact of the number of critics’ reviews is greater for domestic than foreign movies, and greater for domestic art movies than domestic non-art movies.; "Honors thesis", Honors seminar class

Development, inter-rater reliability and feasibility of a checklist to assess implementation (Ch-IMP) in systematic reviews: the case of provider-based prevention and treatment programs targeting children and youth

Cargo, M.; Stankov, I.; Thomas, J.; Saini, M.; Rogers, P.; Mayo-Wilson, E.; Hannes, K.
Fonte: BioMed Central Publicador: BioMed Central
Tipo: Artigo de Revista Científica
Publicado em //2015 EN
Relevância na Pesquisa
36.31%
BACKGROUND: Several papers report deficiencies in the reporting of information about the implementation of interventions in clinical trials. Information about implementation is also required in systematic reviews of complex interventions to facilitate the translation and uptake of evidence of provider-based prevention and treatment programs. To capture whether and how implementation is assessed within systematic effectiveness reviews, we developed a checklist for implementation (Ch-IMP) and piloted it in a cohort of reviews on provider-based prevention and treatment interventions for children and young people. This paper reports on the inter-rater reliability, feasibility and reasons for discrepant ratings. METHODS: Checklist domains were informed by a framework for program theory; items within domains were generated from a literature review. The checklist was pilot-tested on a cohort of 27 effectiveness reviews targeting children and youth. Two raters independently extracted information on 47 items. Inter-rater reliability was evaluated using percentage agreement and unweighted kappa coefficients. Reasons for discrepant ratings were content analysed. RESULTS: Kappa coefficients ranged from 0.37 to 1.00 and were not influenced by one-sided bias. Most kappa values were classified as excellent (n = 20) or good (n = 17) with a few items categorised as fair (n = 7) or poor (n = 1). Prevalence-adjusted kappa coefficients indicate good or excellent agreement for all but one item. Four areas contributed to scoring discrepancies: 1) clarity or sufficiency of information provided in the review; 2) information missed in the review; 3) issues encountered with the tool; and 4) issues encountered at the review level. Use of the tool demands time investment and it requires adjustment to improve its feasibility for wider use. CONCLUSIONS: The case of provider-based prevention and treatment interventions showed relevancy in developing and piloting the Ch-IMP as a useful tool for assessing the extent to which systematic reviews assess the quality of implementation. The checklist could be used by authors and editors to improve the quality of systematic reviews...

The impact of emotions on the helpfulness of movie reviews

Ullah,R.; Zeb,A.; Kim,W.
Fonte: UNAM, Centro de Ciencias Aplicadas y Desarrollo Tecnológico Publicador: UNAM, Centro de Ciencias Aplicadas y Desarrollo Tecnológico
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/01/2015 EN
Relevância na Pesquisa
36.32%
Online customer reviews have become a significant source of product-related information for consumers. As a result of the growing number of customer reviews, determining which customer reviews are the most helpful is important in reducing information overload. The ways in which reviews can be helpful need to be identified. In this study, we examine the impact of emotional content in online customer reviews on the number of votes those customer reviews receive that indicate they were helpful. We find that content that is more emotional yields more votes. Furthermore, our findings suggest that reviews with positive emotional content have a positive effect on review helpfulness whereas reviews with negative emotional content have no effect on review helpfulness. This study contributes to an understanding of emotional content in word of mouth and has important implications for online retailers and consumers.

Spotting Fake Reviews using Positive-Unlabeled Learning

Li,Huayi; Liu,Bing; Mukherjee,Arjun; Shao,Jidong
Fonte: Centro de Investigación en computación, IPN Publicador: Centro de Investigación en computación, IPN
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/09/2014 EN
Relevância na Pesquisa
36.29%
Fake review detection has been studied by researchers for several years. However, so far all reported studies are based on English reviews. This paper reports a study of detecting fake reviews in Chinese. Our review dataset is from the Chinese review hosting site Dianping, which has built a fake review detection system. They are confident that their algorithm has a very high precision, but they don't know the recall. This means that all fake reviews detected by the system are almost certainly fake but the remaining reviews may not be all genuine. This paper first reports a supervised learning study of two classes, fake and unknown. However, since the unknown set may contain many fake reviews, it is more appropriate to treat it as an unlabeled set. This calls for the model of learning from positive and unlabeled examples (or PU-learning). Experimental results show that PU learning not only outperforms supervised learning significantly, but also detects a large number of potentially fake reviews hidden in the unlabeled set that Dianping fails to detect.

Information retrieval for the Cochrane systematic reviews: the case of breast cancer surgery

Cognetti,Gaetana; Grossi,Laura; Lucon,Antonio; Solimini,Renata
Fonte: Istituto Superiore di Sanità Publicador: Istituto Superiore di Sanità
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/03/2015 EN
Relevância na Pesquisa
36.29%
Introduction. Systematic reviews are fundamental sources of knowledge on the state-of-the-art interventions for various clinical problems. One of the essential components in carrying out a systematic review is that of developing a comprehensive literature search. Materials and methods. Three Cochrane systematic reviews published in 2012 were retrieved using the MeSH descriptor breast neoplasms/surgery, and analyzed with respect to the information sources used and the search strategies adopted. In March 2014, an update of one of the reviews retrieved was also considered in the study. Results. The number of databases queried for each review ranged between three and seven. All the reviews reported the search strategies adopted, however some only partially. All the reviews explicitly claimed that the searches applied no language restriction although sources such as the free database Lilacs (in Spanish and Portuguese) was not consulted. Conclusion. To improve the quality it is necessary to apply standards in carrying out systematic reviews (as laid down in the MECIR project). To meet these standards concerning literature searching, professional information retrieval specialist staff should be involved. The peer review committee in charge of evaluating the publication of a systematic review should also include specialists in information retrieval for assessing the quality of the literature search.