1,721,222 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
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Neighborhood Greenness and Prostate Cancer: Association and Explanation in Diverse Populations
No full textProstate cancer (CaP) is the most common non-cutaneous cancer diagnosed among men in the United States. Neighborhood greenness could confer benefits to men at risk of CaP by promoting healthy lifestyles and reducing mortality.
In Chapter 1, we estimated the association between neighborhood greenness and 28-year risk of lethal CaP in the Health Professionals Follow-up Study. We assigned satellite-derived Normalized Difference Vegetation Index (NDVI) with 1 kilometer resolution linked to the participants’ home or work address at the start of follow-up. An interquartile range increase in NDVI was associated with 5% lower rate of lethal CaP (aHR: 0.95, 95% CI: 0.88, 1.03), with stronger associations in non-movers (aHR: 0.92, 95% CI: 0.85, 1.01). Inverse associations were observed among men in high (aHR: 0.90, 95% CI: 0.82, 0.99) but not low (aHR: 1.11, 95% CI: 0.95, 1.29, Phet=0.086) population density areas. There was no evidence of mediation by vigorous physical activity.
In Chapter 2, we estimated the association between neighborhood greenness and 10-year cause-specific mortality among men with CaP in the Pennsylvania Cancer Registry. NDVI with 250m resolution was assigned to participants’ residential address at diagnosis. Comparing men in highest to lowest NDVI quintile, all-cause (aHR: 0.88, 95% CI: 0.84, 0.92, Ptrend<0.0001), prostate-specific (aHR: 0.88, 95% CI: 0.80, 0.99, Ptrend=0.0021), and cardiovascular-specific (aHR: 0.82, 95% CI: 0.74, 0.90, Ptrend<0.0001) mortality were lower. Hypothetical interventions to increase NDVI led to non-significant reductions in all-cause (-5.3%) and prostate-specific (-23.2%), but not cardiovascular-specific mortality disparities (+50.5%).
In Chapter 3, we estimated the association between neighborhood greenness and cardiometabolic risk factors in a cross-sectional, multi-country study in sub-Saharan Africa. NDVI with 250m resolution was assigned to a geocode corresponding to the center of the school or village where the participant was recruited. A 0.11 unit NDVI increase was associated with lower BMI (β: -1.01, 95% CI: -1.35, -0.67), lower odds of overweight/obesity (aOR: 0.73, 95% CI: 0.62, 0.85), diabetes (aOR: 0.77, 95% CI: 0.62, 0.96)), and having ≥3 allostatic load components compared to none (aOR: 0.66, 95% CI: 0.52, 0.85). Associations for BMI, overweight/obesity, and allostatic load remained statistically significant after Bonferroni correction.Epidemiolog
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
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Impact of Biopsy Gleason Upgrading on Biochemical Recurrence and Prediction for Prostate Cancer Aggressiveness Among Obese and African American Men
No full textIntroduction: Biopsy Gleason grade (BGR) upgrading in radical prostatectomy (RP) specimens is associated with a higher risk of biochemical reoccurrence (BCR). However, research to examine this association in high-risk groups for prostate cancer, such as obese, African-American (AA) and advanced age men is limited.
Objectives: To examine whether BGR upgrading is associated with increased risk of biochemical recurrence among obese, AA and older men.
Methods: Retrospective analyses of a cohort of 1028 men with low and medium risk of prostate cancer (PCa) (BGR groups 1&2) who underwent RP between 1995- 2012 at the University of Pennsylvania Health System (UPHS, Philadelphia, PA). Association of BGR upgrading and BCR after RP among obese, AA and older men were examined using log rank test and Cox proportional hazards models.
Results: In this cohort, there were 251 obese men and 200 AA men. Upgrading from BGR 1 and 2 (low and middle risk PCa, respectively) to RPG≥ 3 (high risk PCa) significantly increased BCR; the log rank test p value for upgraded compared to concordant in both groups was 0.0037 and <0.0001respectively.
In low risk PCa group, the log rank P values showed no difference between BGR upgrading and concordance group among obese 0.14, AA 0.07 and older men 0.12. BGR upgrading from both low and middle risk to high risk PCa showed significant difference in BCR compared to concordant group, and was independent of obesity, race and age.
The log rank test p values comparing upgrading versus concordant groups among obese, AA and older men were 0.0005, 0.001 and <0.0001 respectively.
Conclusions: This study confirmed that BGR upgrading from low and middle risk PCa groups to high risk PCa group increases BCR. Additionally, obesity, AA race and older age are independent risk factors for BCR in low risk PCa group regardless of upgrading. Further studies are warranted to confirm these associations in larger and diverse populations.Master’s Program in Clinical Investigatio
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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