1,720,994 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
Meta-analysis in forest biodiversity-ecosystem functioning research
Full text linkUnter dem Begriff der ˈMetaanalyseˈ werden Methoden systematischer und quantitativer Reviews zusammengefasst, welche objektive Aussagen zur Größe und Konsistenz eines untersuchten Effektes über die veröffentlichte Literatur zu ermöglichen. Mit meiner Dissertation trage ich die folgenden Hauptergebnisse zu dem, sich noch entwickelnden, Forschungsfeld der Metaanalyse von Zusammenhängen zwischen Baum-Diversität und Waldfunktionen bei: (i) Effekte der Baumdiversität auf Insektenherbivoren könnten sich entlang eines, bisher nicht berücksichtigten, globalen Gradienten ändern, (ii) artspezifische Mischungseffekte auf das Wachstum verschiedener Baumarten können (noch) nicht zwischen verschiedenen Forschungsansätzen übertragen werden und (iii) unter Berücksichtigung möglicher Korrelationsstrukturen kann die Schätzung fehlender Varianzwerte die Glaubwürdigkeit und Präzision von Metaanalyse-Ergebnissen erhöhen.Meta-analysis refers to a toolbox for conducting systematic quantitative reviews in order to derive unbiased conclusions on the consistency and magnitude of effects across a body of published literature. With this thesis I contribute the following main findings to the emergent field of meta-analyses on tree diversity-forest functioning relationships: (i) tree diversity effects on insect herbivory could change along a not yet considered global gradient, (ii) species-specific effects of tree diversity on growth cannot (yet) be transferred between different research approaches and (iii) imputation of missing variance estimates in meta-analysis dataset can increase the reliability and precision of the obtained grand mean effect (under consideration of different correlation structures)
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
No general support for functional diversity enhancing resilience across terrestrial plant communities
No full textAbstract Aim Understanding the mechanisms promoting resilience in plant communities is crucial in times of increasing disturbance and global environmental change. Here, we present the first meta‐analysis evaluating the relationship between functional diversity and resilience of plant communities. Specifically, we tested whether the resilience of plant communities is positively correlated with interspecific trait variation (following the niche complementarity hypothesis) and the dominance of acquisitive and small‐size species (following the mass ratio hypothesis), and for the context‐dependent effects of ecological and methodological differences across studies. Location Global. Time Period 2004–2021. Major Taxa Studied Vascular plants. Methods We compiled a dataset of 69 independent sites from 26 studies that have quantified resilience. For each site, we calculated functional diversity indices based on the floristic composition and functional traits of the plant community (obtained from the TRY database) which we correlated with resilience of biomass and floristic composition. After transforming correlation coefficients to Fisher's Z ‐scores, we conducted a hierarchical meta‐analysis, using a multilevel random‐effects model that accounted for the non‐independence of multiple effect sizes and the effects of ecological and methodological moderators. Results In general, we found no positive functional diversity–resilience relationships of grand mean effect sizes. In contrast to our expectations, we encountered a negative relationship between resilience and trait variety, especially in woody ecosystems, whereas there was a positive relationship between resilience and the dominance of acquisitive species in herbaceous ecosystems. Finally, the functional diversity–resilience relationships were strongly affected by both ecological (biome and disturbance properties) and methodological (temporal scale, study design and resilience metric) characteristics. Main Conclusions We rejected our hypothesis of a general positive functional diversity–resilience relationship. In addition to strong context dependency, we propose that idiosyncratic effects of single resident species present in the communities before the disturbances and biological legacies could play major roles in the resilience of terrestrial plant communities.Deutsche Forschungsgemeinschaft https://doi.org/10.13039/501100001659Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung https://doi.org/10.13039/501100001711Agence Nationale de la Recherche https://doi.org/10.13039/501100001665Technology Agency of the Czech Republic https://doi.org/10.13039/100014809Inter-American Institute for Global Change Research https://doi.org/10.13039/501100011110Bundesministerium für Bildung und Forschung https://doi.org/10.13039/501100002347National Science Foundation https://doi.org/10.13039/100000001Grantová Agentura České Republiky https://doi.org/10.13039/50110000182
The conservation value of forests and tree plantations for beetle (Coleoptera) communities: A global meta-analysis
No full textkoamabayili/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
- …
