1,720,966 research outputs found
Electronic Questionnaire and the evaluation of customer satisfaction
No full textThe aim of this paper are:
To Provide a brief background on Teaching Effectiveness
To Discuss about vantages of the use of an electronic questionnaire for this kind of Survey
To Describe our Survey on 30 students of a High School
To Describe the results of the Student Satisfaction
Clustering of documents from a two-way viewpoint
No full textMethods for high-dimensional data clustering represents a prolific research area in data mining, encouraging a large quantity of provisional solutions. In text mining and in the analysis of gene expression data, the idea of bidimensional clustering arose, in the sense of finding clusters of documents characterized by cluster of terms (and analogously, clusters of genes and clusters of different experimental conditions). Although we are often more interested in clustering one way of our data structure, however co clustering seems to be convenient (both from an interpretative and a computational viewpoint). Here we try to frame the problem in a multidimensional data analysis perspective, both referring to classic association and/or prediction indexes for contingency tables. Following previous works, we propose the use of a predictability index, Goodman&Kruskal tb, dealing with documents-by-terms tables. After a quick review of the wide literature related to two-way clustering, mainly developed in microarray analysis, we propose a new algorithm belonging to the genetic family, based on the optimization of the predictability index tau-b. We present experimental results to show the effectiveness of our co-clustering algorithm in practice
Methods of quantification for qualitative manifest variables in PLS-PM
No full textThe article is about the problem of the treatment of qualitative variables in the Structural Equation Models with attention to the case of Partial Least Squares Path Modeling. In litterature there are some proposal based on the application of known statistical tecniques to quantify the qualitative variables. Starting from these works we propose an external quantification for only qualitative variables across the Alternating Least Squares, obtaining the optimal qiuantification (vectors of optimalscaling), with the future objective to develop an algorithm that compute simultaneusly the optimal vectors of optimal scaling and the optimal regression coefficients between the variables
Methods of quantification of qualitative variables and their use in Structural Equation Model
No full textLo studio sempre crescente di fenomeni caratterizzati da relazioni di causa-effetto tra variabili di natura qualitativa e quantitativa, pone l’accento su un problema ancora aperto in letteratura, ovvero l’utilizzo simultaneo di indicatori qualitativi e quantitativi nella stima delle relazioni tra variabili. Il nostro lavoro si concentra sullo studio della problematica e propone una soluzione per il caso di Modelli ad Equazioni Strutturali ed in particolare per il PLS Path Modeling. L’obiettivo è la ricerca di un metodo di optimal scaling che consenta di ottenere la migliore quantificazione per le variabili qualitative tenendo presente anche il legame e il ruolo che esse hanno rispetto agli altri indicatori. Pertanto si propone come tecnica quella dell’Analisi Fattoriale Multipla (AFM) nella sua estensione al caso di matrici miste (Analisi Fattoriale Multipla per Dati Misti - AFDM), per poi procedere con lo sviluppo dell’algoritmo del PLS Path Modeling. Un caso pratico è proposto per illustrare il metodo
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
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