1,721,073 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
Complex models and computational methods in statistics
No full textThe volume offers an updated overview of statistical methods for high-dimensional problems. It includes a wide range of statistical applications. It is addressed to the statistician working at the forefront of statistical analysis
Multidimensional connected set detection in clustering based on nonparametric density estimation
No full textSognare il numero, il pari, il dispari. Una “matematica-fantasma” nel "Parmenide" di Platone
No full text1.L’intervento si concentra sull’ultimo passo del Parmenide in cui compaiono arithmos, pari e dispari (164 c 8-165 e 1). Si tratta di un numero, di un pari e di un dispari, di cui «si opina» (165 e 1) o «appare» senza corrispondere a verità (164 e 3), «come sognando in un sogno» (164 d 3), l’appartenenza ad onkoi, ossia “agglomerati” (164 d 1); a ciascun onkos spetta, fra le altre proprietà che se ne ricordano, solo un «simulacro di
uguaglianza» (165 a 5: phantasma isotetos): l’uno, infatti, che sembra costituirlo, ma
«non è», appare istantaneamente uno e infinitamente molteplice, piccolissimo e
immenso (p. es. 164 d 2-4); esso stesso può sembrare qualcosa di unitario, ma
allorché venga «colto con il pensiero» (165 a 8, b 6) di fatto si frantuma in una pluralità illimitata, come quando si osserva da vicino qualcosa che si vedeva da lontano (cfr. 165 a 5-c 5); di per sé e in relazione agli altri, esso appare simile e dissimile, identico e diverso, in contatto e separato, immobile e in movimento, come le figure dipinte in prospettiva (165 c 6-e 1).
2. Il passo ha uno sfondo non solo “fisicofenomenista”,
ma anche matematico. È già stato rilevato dagli interpreti (p. es.
Migliori, Sayre, Graeser, Coxon) il suo nesso con argomenti che possono risalire a Zenone, a Democrito e a Protagora (in linea con Tim. 54 d e Theaet. 152 d); si può tuttavia riscontrare più di un legame con alcuni tratti della aritmetike e della logistike,
condivisi anche dalla geometria, descritti in Resp. VI-VII(cfr. Resp. VII, 533 b 6).
3. L’aspetto “fenomenico” della matematica si può riscontrare anche in punti precedenti del dialogo (p. es. 144 a 6-7; 158 b 8-c 5), nei quali si prospetta un numero svincolato sia dall’essere, sia dall’uno.
Questi numeri “fantasma” funzionano come una sorta di contro-modello rispetto a
tutte le multiformi apparizioni di arithmos, pari e dispari, o di singoli arithmoi, nel corso del dialogo, dove i numeri, intesi sia come numeri-oggetto (insiemi di unità;
membri di una serie), sia come proprietà numeriche (143 d 1 ss.), di cose sensibili e di forme (130 a 2, 135 e 3-4), presentano sempre un rapporto, complicato ma
essenziale, con l’essere e con l’uno
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
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