1,720,958 research outputs found
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
Get PDFWe 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
Análisis de las series de precios de los productos forestales en Cataluña: consideraciones prácticas y resultados disponibles
No full textEn aquest número us presentem un segon article sobre l’anàlisi de les sèries de preus que se centra en aspectes pràctics que complementen la metodologia explicada precedentment (Raddi, 2023).
L’elaboració d’una sèrie històrica planteja un dubte operatiu cabdal: cal considerar la sèrie completa, és a dir, des de la primera dada disponible, o bé limitar-la a un període recent?
Encara que les sèries més llargues semblarien més significatives, incloure preus de fa seixanta o més anys augmenta el risc d’introduir elements de biaix. Les línies de tendència calculades mitjançant la taxa de variació anual del preu real recullen la interacció
entre oferta i demanda ocorreguda en el passat i que pot canviar al llarg dels anys. Per tant, caldria excloure aquells preus ja massa llunyans per no afectar els resultats de l’elaboració.
El criteri suggerit per definir el període a considerar fa servir la definició econòmica de curt, mitjà i llarg termini, complementada amb la de torn forestal.
L’Observatori Forestal de Catalunya facilita la taxa de variació anual del preu real dels productes forestals calculada a llarg i mitjà termini, així com la perspectiva de mercat a curt termini. Aquesta informació permet conèixer-ne les tendències i ajudar en la fase de disseny d’un projecte, o durant la seva gestió.In this issue we present a second article on price time series analysis focuses on practical aspects that complement the methodology previously explained (Raddi, 2023).
The development of a historical series raises a crucial operational question: should we consider the complete series, that is, starting from the first available data, or limit ourselves to a recent period?
Although longer series tend to be more significant, including prices from sixty or more years ago increases the risk of introducing elements of bias. The trend lines calculated using the real price change rate reflect the interaction between supply and demand that has occurred in the past and which may change over the years. Therefore, prices from too far back should be excluded in order not to affect the outputs results.
The suggested criterion for defining the period to be considered uses the economic
definition of the short, medium and long term, complemented with that of forest rotation.
The Observatori Forestal de Catalunya (Forest Observatory of Catalonia) provides the real price change rate of forest products calculated in the long and medium term, as well as the short-term outlook. This information allows us to determine trends, helping
in the design phase of projects as well as during their management.En este número presentamos un segundo artículo sobre el análisis de las series de precios que se centra en aspectos prácticos que complementan la metodología explicada precedentemente (Raddi, 2023).
La elaboración de una serie histórica plantea una duda operativa crucial: ¿hay que considerar la serie completa, es decir, desde el primer dato disponible, o bien limitarla a un periodo reciente?
Aunque las series más largas suelen ser más significativas, incluir precios de hace sesenta
o más años aumenta el riesgo de introducir elementos de sesgo. Las líneas de tendencia calculadas mediante la tasa de variación anual del precio real recogen la interacción entre oferta y demanda ocurrida en el pasado y que puede cambiar a lo largo de los años. Por lo tanto, se deberían excluir aquellos precios ya demasiado lejanos para no afectar a los resultados de la elaboración.
El criterio sugerido para definir el periodo a considerar utiliza la definición económica de corto, medio y largo plazo, complementada con la de turno forestal.
El Observatori Forestal de Catalunya facilita la tasa de variación anual del precio real de los productos forestales calculada a largo y medio plazo, así como la perspectiva de mercado a breve plazo. Esta información permite conocer sus tendencias y ayudar en la fase de diseño de un proyecto, o a lo largo de su gestión
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
Una aproximación al análisis de las series de precios de los productos forestales en Cataluña: el ejemplo de la tendencia del pino silvestre
No full textEl preu de la fusta és una de les variables més importants per a la viabilitat econòmica de la gestió forestal. Els preus de mercat observats reflecteixen les condicions presents i passades de l’oferta i la demanda. Quan fem hipòtesis sobre preus futurs, dos factors són cabdals: la inflació expectada i la variació dels preus.
En aquest article s’exposa un mètode simple per calcular la línia de tendència a través de la taxa de variació del preu real, estimada mitjançant un model economètric basat en la linealització de la capitalització composta tractada en la matemàtica financera. Sempre que hi hagi disponible una sèrie de preus versemblants, aquest mètode és recomanable per a tots aquells usuaris que només tinguin coneixements bàsics d’informàtica i estadística. Tot i que es pugui utilitzar per predir els preus a mitjà termini, finalment seran les condicions de mercat vigents en aquell moment les que influiran en la presa de decisions sobre la compravenda de productes forestals.
Havent calculat la taxa de variació del preu real dels darrers quaranta anys, s’evidencia que a Catalunya la gran majoria dels productes forestals mostren una tendència a la baixa, tot i l’augment registrat recentment, sobretot pel que fa als diferent tipus de fusta.Timber price is one of the most important variables affecting the economic feasibility of forest management. Observed market prices reflect present and past conditions of supply and demand for products. When deciding on how to estimate prices that could occur sometime in the future, we should consider two factors: the expected inflation and the price change.
This paper discusses a simple method to calculate the trend line by means of the real price change rate, estimated by an econometric model based on the linearization of the compounding approach. This method is recommended for less skilled IT and statistics users, provided that an acceptable price time series is available. Although it may be used to predict prices in the medium term, in the end it will be the market conditions prevailing at the time that will drive decision-making on the sale of forest products.
After having calculated the real price change rate of the last forty years, it is evident that in Catalonia the vast majority of forest products show a downward trend, despite the increase registered recently, especially for timber.El precio de la madera es una de las variables más importantes para la viabilidad económica de la gestión forestal. Los precios de mercado observados reflejan las condiciones presentes y pasadas de la oferta y la demanda. Cuando hacemos hipótesis sobre los precios futuros, dos factores resultan esenciales: la inflación esperada y la variación de los precios.
Este artículo expone un método sencillo para calcular la línea de tendencia a través de la tasa de variación del precio real, estimada mediante un modelo econométrico basado en la linealización de la capitalización compuesta tratada en la matemática financiera. Siempre que haya disponible una serie de precios verosímiles, este método es recomendable para todos aquellos usuarios que solo tengan conocimientos básicos de informática y estadística. Aunque se pueda utilizar para predecir los precios a medio plazo, finalmente serán las condiciones de mercado vigentes en aquel momento las que influyan en la toma de decisiones sobre la compraventa de productos forestales.
Después de haber calculado la tasa de variación del precio real de los últimos cuarenta años, se evidencia que en Cataluña la gran mayoría de los productos forestales muestran una tendencia a la baja, a pesar del aumento registrado recientemente, sobre todo en lo que se refiere a los diferentes tipos de madera
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