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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
Trajectories of physical activity measured by accelerometry in the first years of life and its determinants and correlates: a study in the 2015 Pelotas (Brazil) Birth Cohort.
No full textThe objective was to describe the trajectories of physical activity (PA) from one to four years old of children belonging to the 2015 Birth Cohort of Pelotas (RS) and to verify the associations with sociodemographic, gestational, perinatal, environmental, maternal, behavioral, and breastfeeding determinants and correlates. The study used data from the perinatal, one-, two-, and four-years follow-ups. PA was measured using accelerometers worn on the left wrist for two days at one and two years, and seven days at four years and the data were used in raw form in milli-g. One- to four-year PA
trajectories were plotted for children with three measures of PA (n=1,798) using group based trajectory modeling. Exposures were collected by questionnaire and Poisson regression models with robust variance were used to test associations with trajectories. In article II, associations of correlates with PA at 1 (n=2,974), 2 (n=2,645), and 4 years (n=2,955) were tested by linear regression. Two PA trajectories (Moderate and High) were identified, both showing a linear increase in PA in the first years, differing in
volume. In article I, female sex (PR: 0.91; 0.88/0.94), high maternal education (PR: 0.93; 0.88/0.97), and high birth weight (PR: 0.91; 0.85/0.97) reduced the probability that the child would be in the High PA, and birth order ≥3 (PR: 1.06; 1.01/1.11) increased this probability. In article II, attending school in some follow-up (PR: 0.95; 0.91/0.99) and always attending public school (PR: 0.95; 0.90/0.99) reduced the probability of the child being in the High PA. Children of mothers who performed any leisure PA (PR: 1.08; 1.01/1.15) and other leisure PA (except walking) in more than one follow-up (PR: 1.13; 1.04/ 1.21) and children who had adequate sleep time at 2 (PR: 1.11; 1.02/1.21) or <2 follow-ups (PR: 1.10; 1.01/1.21) were more prone to the High PA trajectory. At one year, partial breastfeeding (β: 0.56; 0.08/1.05) was positively associated with PA and excessive screen time, negatively (β: -1.24; -1.77/-0,72). At two years, attending public (β: -1.71; -3.07/-0.35) or private school (β -1.32; -2.46/-
0.17) were negatively associated with PA, while the maternal leisure walk (β: 1.47; 0.11/2.83) and the mother perceived her child as more active than children of the same age (β: 1.69; 0.25/3.13) were positively associated with childhood PA. At four years, duration of breastfeeding for more than six months (except children who continued to be partially breastfed), ≥2 siblings (β: 1.58; 0.27/2.89), other maternal leisure PA except walking (β: 1.94; 0.64/3.24) and the mother perceived her child as more active than children of the same age (β: 3.59; 2.61/4.56) were positively associated with PA levels. Public school (β: -1.79; -2.95/-0.65) and the mother perceived the child as less active (β: -4.80; -6.93/-2.67) were negatively associated with PA. These characteristics should be considered when planning PA programs and interventions for young children.Sem bolsaO objetivo foi descrever as trajetórias de atividade física (AF) do primeiro ao quarto ano de vida das crianças pertencentes à Coorte de nascimentos de 2015 de Pelotas (RS) e verificar as associações com determinantes e correlatos sociodemográficos, gestacionais, perinatais, ambientais, maternos, comportamentais e aleitamento materno. O estudo utilizou dados dos acompanhamentos perinatal, um, dois e quatro anos. A AF foi medida através de acelerômetros utilizados no punho esquerdo durante
dois dias ao um e dois anos, e, sete dias aos quatro anos e os dados foram utilizados na forma bruta em mili-g. Trajetórias de AF primeiro ao quarto ano de vida foram traçadas para as crianças com três medidas de AF (n=1.798) por meio de modelagem de trajetória baseada em grupos. As exposições foram coletadas por questionário e modelos de regressão de Poisson com variância robusta foram utilizados para testar associações com as trajetórias. No artigo II, as associações dos correlatos com a AF ao 1 (n=2.974), 2 (n=2.645) e 4 anos (n=2.955) foram testadas por regressão linear. Foram identificadas duas trajetórias de AF (Média e Superior), ambas apresentando aumento linear da AF nos primeiros anos, diferindo em volume. No artigo I, sexo feminino (RP: 0,91; 0,88/0,94), alta escolaridade materna (RP: 0,93; 0,88/0,97) e alto peso ao nascer (RP: 0,91; 0,85/0,97) reduziram a probabilidade de a criança estar no grupo AF Superior e ordem de nascimento ≥3 (RP: 1,06; 1,01/1,11) aumentou essa
probabilidade. No artigo II, frequentar a escola em algum acompanhamento (RP: 0,95; 0,91/0,99) e sempre frequentar escola pública (RP: 0,95; 0,90/0,99) reduziram a probabilidade de a criança estar no grupo AF Superior. Filhos de mães que realizaram qualquer AF de lazer (RP: 1,08; 1,01/1,15) e alguma outra AF de lazer (exceto caminhada) em mais de um acompanhamento (RP: 1,13; 1,04/1,21) e crianças que tiveram tempo de sono adequado em 2 (RP: 1,11; 1,02/1,21) ou <2 acompanhamentos
(RP: 1,10; 1,01/1,21) eram mais propensas a trajetória de AF Superior. Ao um ano, a amamentação parcial (β: 0,56; 0,08/1,05) esteve positivamente associada a AF e o tempo de tela excessivo, negativamente (β: -1,24; -1,77/-0,72). Aos dois anos, frequentar escola pública (β: -1,71; -3,07/-0,35) ou privada (β -1,32; -2,46/-0,17) foi negativamente associada a AF, enquanto a caminhada de lazer materna (β: 1,47;0,11/2,83) e a mãe perceber seu filho como mais ativo do que crianças da mesma
idade (β: 1,69; 0,25/3,13) estiveram positivamente associadas a AF infantil. Aos quatro anos, a duração da amamentação por mais de seis meses (exceto crianças que seguiam em amamentação parcial), ≥2 irmãos (β: 1,58; 0,27/2,89), alguma AF de lazer materna com exceção da caminhada (β: 1,94; 0,64/3,24) e a mãe perceber seu filho como mais ativo do que crianças da mesma idade (β: 3,59; 2,61/4,56) apresentaram associação positiva com os níveis de AF. Já frequentar escola pública (β: -1,79; -2,95/-0,65) e a mãe perceber o filho como menos ativo (β: -4,80; -6,93/-2,67) estiveram
negativamente associados à AF. Essas características devem ser consideradas ao planejar programas e intervenções de AF para crianças na primeira infância
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
Trajectories of physical activity measured by accelerometry in the first years of life and its determinants and correlates: a study in the 2015 Pelotas (Brazil) Birth Cohort.
No full textThe objective was to describe the trajectories of physical activity (PA) from one to four years old of children belonging to the 2015 Birth Cohort of Pelotas (RS) and to verify the associations with sociodemographic, gestational, perinatal, environmental, maternal, behavioral, and breastfeeding determinants and correlates. The study used data from the perinatal, one-, two-, and four-years follow-ups. PA was measured using accelerometers worn on the left wrist for two days at one and two years, and seven days at four years and the data were used in raw form in milli-g. One- to four-year PA
trajectories were plotted for children with three measures of PA (n=1,798) using group based trajectory modeling. Exposures were collected by questionnaire and Poisson regression models with robust variance were used to test associations with trajectories. In article II, associations of correlates with PA at 1 (n=2,974), 2 (n=2,645), and 4 years (n=2,955) were tested by linear regression. Two PA trajectories (Moderate and High) were identified, both showing a linear increase in PA in the first years, differing in
volume. In article I, female sex (PR: 0.91; 0.88/0.94), high maternal education (PR: 0.93; 0.88/0.97), and high birth weight (PR: 0.91; 0.85/0.97) reduced the probability that the child would be in the High PA, and birth order ≥3 (PR: 1.06; 1.01/1.11) increased this probability. In article II, attending school in some follow-up (PR: 0.95; 0.91/0.99) and always attending public school (PR: 0.95; 0.90/0.99) reduced the probability of the child being in the High PA. Children of mothers who performed any leisure PA (PR: 1.08; 1.01/1.15) and other leisure PA (except walking) in more than one follow-up (PR: 1.13; 1.04/ 1.21) and children who had adequate sleep time at 2 (PR: 1.11; 1.02/1.21) or <2 follow-ups (PR: 1.10; 1.01/1.21) were more prone to the High PA trajectory. At one year, partial breastfeeding (β: 0.56; 0.08/1.05) was positively associated with PA and excessive screen time, negatively (β: -1.24; -1.77/-0,72). At two years, attending public (β: -1.71; -3.07/-0.35) or private school (β -1.32; -2.46/-
0.17) were negatively associated with PA, while the maternal leisure walk (β: 1.47; 0.11/2.83) and the mother perceived her child as more active than children of the same age (β: 1.69; 0.25/3.13) were positively associated with childhood PA. At four years, duration of breastfeeding for more than six months (except children who continued to be partially breastfed), ≥2 siblings (β: 1.58; 0.27/2.89), other maternal leisure PA except walking (β: 1.94; 0.64/3.24) and the mother perceived her child as more active than children of the same age (β: 3.59; 2.61/4.56) were positively associated with PA levels. Public school (β: -1.79; -2.95/-0.65) and the mother perceived the child as less active (β: -4.80; -6.93/-2.67) were negatively associated with PA. These characteristics should be considered when planning PA programs and interventions for young children.Sem bolsaO objetivo foi descrever as trajetórias de atividade física (AF) do primeiro ao quarto ano de vida das crianças pertencentes à Coorte de nascimentos de 2015 de Pelotas (RS) e verificar as associações com determinantes e correlatos sociodemográficos, gestacionais, perinatais, ambientais, maternos, comportamentais e aleitamento materno. O estudo utilizou dados dos acompanhamentos perinatal, um, dois e quatro anos. A AF foi medida através de acelerômetros utilizados no punho esquerdo durante
dois dias ao um e dois anos, e, sete dias aos quatro anos e os dados foram utilizados na forma bruta em mili-g. Trajetórias de AF primeiro ao quarto ano de vida foram traçadas para as crianças com três medidas de AF (n=1.798) por meio de modelagem de trajetória baseada em grupos. As exposições foram coletadas por questionário e modelos de regressão de Poisson com variância robusta foram utilizados para testar associações com as trajetórias. No artigo II, as associações dos correlatos com a AF ao 1 (n=2.974), 2 (n=2.645) e 4 anos (n=2.955) foram testadas por regressão linear. Foram identificadas duas trajetórias de AF (Média e Superior), ambas apresentando aumento linear da AF nos primeiros anos, diferindo em volume. No artigo I, sexo feminino (RP: 0,91; 0,88/0,94), alta escolaridade materna (RP: 0,93; 0,88/0,97) e alto peso ao nascer (RP: 0,91; 0,85/0,97) reduziram a probabilidade de a criança estar no grupo AF Superior e ordem de nascimento ≥3 (RP: 1,06; 1,01/1,11) aumentou essa
probabilidade. No artigo II, frequentar a escola em algum acompanhamento (RP: 0,95; 0,91/0,99) e sempre frequentar escola pública (RP: 0,95; 0,90/0,99) reduziram a probabilidade de a criança estar no grupo AF Superior. Filhos de mães que realizaram qualquer AF de lazer (RP: 1,08; 1,01/1,15) e alguma outra AF de lazer (exceto caminhada) em mais de um acompanhamento (RP: 1,13; 1,04/1,21) e crianças que tiveram tempo de sono adequado em 2 (RP: 1,11; 1,02/1,21) ou <2 acompanhamentos
(RP: 1,10; 1,01/1,21) eram mais propensas a trajetória de AF Superior. Ao um ano, a amamentação parcial (β: 0,56; 0,08/1,05) esteve positivamente associada a AF e o tempo de tela excessivo, negativamente (β: -1,24; -1,77/-0,72). Aos dois anos, frequentar escola pública (β: -1,71; -3,07/-0,35) ou privada (β -1,32; -2,46/-0,17) foi negativamente associada a AF, enquanto a caminhada de lazer materna (β: 1,47;0,11/2,83) e a mãe perceber seu filho como mais ativo do que crianças da mesma
idade (β: 1,69; 0,25/3,13) estiveram positivamente associadas a AF infantil. Aos quatro anos, a duração da amamentação por mais de seis meses (exceto crianças que seguiam em amamentação parcial), ≥2 irmãos (β: 1,58; 0,27/2,89), alguma AF de lazer materna com exceção da caminhada (β: 1,94; 0,64/3,24) e a mãe perceber seu filho como mais ativo do que crianças da mesma idade (β: 3,59; 2,61/4,56) apresentaram associação positiva com os níveis de AF. Já frequentar escola pública (β: -1,79; -2,95/-0,65) e a mãe perceber o filho como menos ativo (β: -4,80; -6,93/-2,67) estiveram
negativamente associados à AF. Essas características devem ser consideradas ao planejar programas e intervenções de AF para crianças na primeira infância
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
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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