1,721,050 research outputs found
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
High risk of HIV in non-brothel based female sex workers in India.
Full text linkBACKGROUND: Heterosexual contact is the most common mode of HIV transmission in India that is largely linked to sex work. We assessed the non-use of condoms in sex work and with regular sex partners by female sex workers (FSWs), and identified its associations that could assist in planning HIV prevention programmes. METHODS: Detailed documentation of various aspects of sex work, and sexual behaviour with regular sex partners, was done through confidential interviews for 6,648 FSWs in 13 districts in the Indian state of Andhra Pradesh. Multivariate analysis was done to understand condom non-use with clients. RESULTS: 5,010 (75.4%), 1,499 (22.5%), and 139 (2.1%) FSWs were street-, home-, and brothel-based, respectively. Of the total 6,648 FSWs, 6,165 (92.7%) had penetrative vaginal/anal sex with at least one client in the last 15 days, and of these 2,907 (47.2%; 95% CI 41.2-53.2%) reported non-use of condom with at least one of her last three clients. Lack of knowledge that HIV could be prevented (odds ratio 5.01; 95% CI 4.38-5.73), no access to free condoms (odds ratio 3.45; 95% CI 2.99-3.98), being street-based as compared with brothel-based (odds ratio 3.36; 95% CI 1.87-6.04), and no participation in FSW support groups (odds ratio 2.02; 95% CI 1.50-2.70) were the most significant predictors of condom non-use with clients. Other associations included lower social support, lower income, age >24 years, illiteracy, and living in medium-size urban or rural areas. Of the 2582 who had penetrative sex with regular sex partner within the last 7 days, 2428 (94%; 95% CI 92.1-95.9%) had not used condom at last sex, and 1032 (41.8%) had neither used condom consistently with clients nor with regular sex partner. CONCLUSION: About half the FSWs do not use condom consistently with their clients in this Indian state putting them at high risk of HIV infection. Non-brothel-based FSWs, who form the majority of sex workers in India, were at a significantly higher risk of HIV infection as compared with brothel-based FSWs. With their high vulnerability, the success of expansion of HIV prevention efforts will depend on achieving and sustaining an environment that enables HIV prevention with the non-brothel based FSWs
[The health gap in Mexico, measured through child mortality].
No full textOBJECTIVE: To estimate the health gap in Mexico, as evidenced by the difference between the observed 1998 mortality rate and the estimated rate and the estimated rate for the same year according to social and economic indicators, with rates from other countries. MATERIAL AND METHODS: An econometric model was developed, using the 1998 child mortality rate (CMR) as the dependent variable, and macro-social and economic indicators as independent variables. The model included 70 countries for which complete data were available. RESULTS: The proposed model explained over 90% of the variability in CMR among countries. The expected CMR for Mexico was 22% lower that the observed rate, which represented nearly 20,000 excess deaths. CONCLUSIONS: After adjusting for differences in productivity, distribution of wealth, and investment in human capital, the excess child mortality rate suggested efficiency problems in the Mexican health system, at least in relation to services intended to reduce child mortality. The English version of this paper is available at: http://www.insp.mx/salud/index.html
Resource requirements to fight HIV/AIDS in Latin America and the Caribbean.
No full textOBJECTIVES: Economists and epidemiologists from 10 countries in Latin America and the Caribbean (LAC) reviewed the methods used to develop estimates for resource requirements to address HIV/AIDS prevention and care in low- and middle-income countries. METHODS: They applied their country-specific knowledge to re-estimate the costs, coverage, and capacity of their health and education systems to expand HIV/AIDS interventions by 2005. A discrepancy of 173 million US dollars exists between the model estimates and those of country specialists. RESULTS: The most important difference between the model estimates and those of country specialists was in the estimated future price of highly active antiretroviral therapy. To a large extent, the estimates of the model reflect the efficiency gains that could result from purchasing arrangements that lead LAC countries to lower prices for antiretroviral drugs. CONCLUSION: This preliminary exercise with 10 LAC countries confirmed the validity of the use of these estimates as tools at the international level, given current data limitations, both to guide the allocation of resources across diseases and countries, and for advocacy and resource mobilization. In addition, with the country revisions, these estimates have also been shown to be key tools for country-level strategic planning
Conditional cash and in-kind transfers increase household total and food consumption in poor rural communities in Mexico
Full text link[Ligase chain reaction testing of pooled urine specimens to diagnose Chlamydia trachomatis infection].
Full text linkOBJECTIVE: The purpose of this study was to assess the utility and validity of pooling urine samples for molecular diagnosis of Chlamydia trachomatis infection. MATERIAL AND METHODS: Of 1,220 urine samples collected from Mexican female and male adolescents, 305 pools were composed of fourth individual samples each, based on a calculation of optimal pool size. These were processed by ligase chain reaction (LCR) for the detection of C. trachomatis. Positive and gray-zone pools were reanalyzed individually. Cost savings were calculated comparing actual costs of testing to the cost that would have been incurred testing all 1,220 samples individually. RESULTS: Pools results were: 56 positive, 19 gray-zones and 230 negative. Following individual retesting of positive and gray-zone pools, 59 cases of C. trachomatis infection were identified (4.8% prevalence). Thus, a total of 601 LCR tests were performed, for a 50.4% savings considering only the direct cost of the test. CONCLUSIONS: Our experience shows that sample pooling is both a reliable and convenient tool for CT surveillance in our setting. It should be considered in other similar settings where limited resources constraint surveillance of STIs
- …
