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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
Impact of active pariodontal therapy on subject-related periodontal prognosis as assessed with a simplified method for periodontal risk assessment
No full textAIMS: The present study was performed to evaluate the amount of active periodontal therapy (AT) as well as AT outcomes in patients with different periodontal prognosis, as assessed with a simplified risk assessment method (UniFe; Farina et al. 2007, Trombelli et al. 2009),.
METHODS: Data from 109 patients (42 males; mean age: 42.2 ± 10.2 years, range 22-62 years; 5 former smokers and 32 smokers; 4 diabetics) undergone AT were retrospectively obtained from the record charts at 2 clinical centers, and used for analysis. According to the individual treatment plan, patients had undergone single or multiple sessions of non-surgical instrumentation and/or periodontaly surgery and/or extraction of teeth with a hopeless prognosis.
Pre-AT, subject-related periodontal risk was calculated according to the UniFe method on the basis of 5 parameters (smoking status, diabetic status, number of sites with PPD≥ 5mm, Bleeding on Probing Index, and bone loss/age ratio) and scored at the subject level on a scale from 1 (low risk) to 5 (high risk).
For each patient, AT outcomes were assessed in terms of mean PPD reduction.
RESULTS: The mean duration of AT was 1.4±0.8 years (range: 0.2 - 4.7). During AT, patients underwent 5.4 ± 2.9 sessions of non-surgical instrumentation and 2.9±1.7 sessions of osseous (resective or reconstructive) periodontal surgery. A mean of 1.1±1.5 teeth were lost during AT, with 51% of patients experiencing the loss of at least 1 tooth.
Before AT, risk score was 1, 2, 3, 4 or 5 in 2%, 0%, 3%, 28% and 68% of patients, respectively. Patients with a risk score of 5 underwent more surgeries during AT compared to patients with a risk score of 4 (p< 0.01), while no differences were observed among risk categories for the number of sessions of non-surgical instrumentation and the number of teeth lost during AT.
Mean PPD reduction was significantly different among groups, with risk-5 patients showing a significantly greater PPD reduction compared to risk-4 and risk-3 patients (p< 0.001).
CONCLUSIONS: Subject-related periodontal prognosis, as evaluated with the UniFe method, seems to have a predictive value for the need for periodontal surgery during AT as well as the magnitude of PPD reduction following AT
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