1,721,255 research outputs found
Re: Mini percutaneous nephrolithotomy is a noninferior modality to standard percutaneous nephrolithotomy for the management of 20–40 mm renal calculi: a multicenter randomized controlled trial
No full textThe randomised trial by Zeng and co-workers [1] compared standard versus mini percutaneous nephrolithotomy (PCNL) in the management of 20–40-mm kidney stones in a collaborative effort accomplished in China. All participating surgeons worked in high-volume centres, as proved by an incredible operative time of 35–36 min (well below the 80 min previously reported by the same lead author) [2]. This noninferiority trial proved a similar stonefree rate in the two arms with comparable operative times and hospital stay (the differences of 2.2 min and <1 d are of no clinical significance), and a lower haemoglobin decrease in the mini-PCNL arm but similar complication rates
Non linear Principal Component Analysis with external information in the study of Customer Satisfaction
No full textSANMARTÍN ESPLUGUES, J. & GUTIÉRREZ LOMBARDO, R. (Editores) (2017): Técnica y ser humano. México: Centro de Estudios Filosóficos, Políticos y Sociales Vicente Lombardo Toledano.
No full textReseña del libro: SANMARTÍN ESPLUGUES, J. y GUTIÉRREZ LOMBARDO, R. (Editores) (2017). Técnica y ser humano. México: Centro de Estudios Filosóficos, Políticos y Sociales Vicente Lombardo Toledano
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
Features of the polynomial biplots for ordered contingency tables
No full textFor more than 20 years variants of correspondence analysis have arisen that accommodate for the structure of ordered categorical variables using orthogonal polynomials. When the visual display from this analysis is the biplot, projections linking the origin to the standard coordinate of each category is a common feature.
In the case when a column variable, say, consists of ordered categories, the biplot can be constructed so that their standard coordinate is determined using orthogonal polynomials which require a set of a priori scores that reflect the ordered structure of the categories. When the first two polynomials are used to construct the biplot they produce a configuration of standard coordinates that appear to be parabolic in shape.
This paper verifies the exact nature of this parabolic relationship and examines the various features of this configuration of points. Particular emphasis is given to the focus, vertex, intercepts and directrix of this relationship and we also briefly examine the impact of choosing different a priori scores on these features. The R function, parabola.exe(), used to perform these calculates is included as supplementary material to this paper
Visualizing departures from symmetry. A study on cardiovascular risk among patients with diabetes.
No full textVariations 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
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