IPS - ESTB - SMG - Comunicações em congressos
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- Métodos de consenso em análise de dadosPublication . Marques, AnabelaNeste trabalho apresenta-se alguns métodos de consenso que permitem ao investigador encontrar uma classificação hierárquica única para um conjunto de r classificações hierárquicas, ou r dendrogramas, ou r árvores.
- Classificação hierárquica de consensoPublication . Marques, AnabelaNeste trabalho apresenta-se a técnica Classificação segundo uma direcção, introduzida por Vichi, em 1995. Esta técnica tem por base a teoria da Análise Classificatória e dos Métodos de Consenso. Aplicando a Classificação segundo uma direcção a um conjunto de dados tridimensionais obtém-se uma classificação hierárquica única.
- Combining models in discrete discriminant analysis in the multiclass casePublication . Marques, Anabela; Ferreira, Ana Sousa; Cardoso, MargaridaThe idea of combining models in Discrete Discriminant Analysis (DDA) is present in a growing number of papers which aim to obtain more robust and more stable models than any of the competing ones. This seems to be a promising approach since it is known that different DDA models perform differently on different subjects (Brito et al.(2006)). In particular, this will be a more relevant issue if the groups are not well separated, which often occurs in practice. In the present work a new methodological approach is suggested which is based on DDA models' combination. The multiclass problem is decomposed into several dichotomous problems that are nested in a hierarchical binary tree (Sousa Ferreira (2000), Brito et al. (2006)) and at each level of the binary tree a new combining model is proposed to derive the decision rule. This combining model is based on two well known models in the literature - the First-order Independence Model (FOIM) and the Dependence Trees Model (DTM) (Celeux and Nakache (1994)). The MATLAB software is used for the algorithms' implementation and the proposed approach is illustrated in a DDA application.
- Fundamentações de product placement: Uma análise de conteúdos híbridosPublication . Ferreira, Neuza; Silva, Pedro; Falcoeiras, TiagoA importância do Product Placement para as marcas e para as indústrias de entretenimento tem vindo a aumentar exponencialmente. A procura da realização de publicidade de uma maneira discreta e diferente, a crescente saturação dos espectadores face à publicidade tradicional ou os retornos advindos da sua aplicação deram ao Product Placement motivos para continuar a ser aplicado pelas marcas a nível mundial. Neste estudo são apresentados alguns exemplos da utilização do Product Placement e as consequências para as empresas envolvidas e para os espectadores. O cruzamento de conteúdos, assente no seu carácter híbrido, a dependência das empresas face à Publicidade e ao Marketing enquanto estratégias de comunicação integradas, a preocupação com questões de regulação ou problemas entre argumentadores e guionistas são algumas das conclusões verificadas.
- Phase change in engineering knowledge production: from an academic to an entrepreneurial contexPublication . Williams, Bill; Figueiredo, JoséThis study uses the characterization of contrasting modes of knowledge production to follow the engineering design and research activity of a group of engineers who migrated from an academic environment to a successful startup firm. Semi-structured interviews were used to construct a narrative approach characterizing their activities in the two settings. We relate their practice to Mode 1 and Mode 2 knowledge production phases and note the importance of a phase change in the transition between the two modes.
- Facilitating the adoption and dissemination of active and cooperative learning methodologies in engineering education using a learner activity index approachPublication . Williams, Bill; Carvalho, Isabel S.The overall aims of the project are centred on the adoption and dissemination in engineering education at institutional and inter-institutional level in Portugal of good practice with regard to Active and Cooperative Learning (ACL). We aim to achieve this over a three-year project lifetime through a two-phase strategy: i) Initial implementation of ACL techniques in formal teaching contexts at departmental level in two engineering colleges through the use of self and peer observation using a semi-quantitative tool to measure a Learner Activity Index; ii) Subsequent dissemination of the approach to other departments and colleges using online Community of Practice (CoP) cultivation strategies and Web 2.0 tools.
- Discrete discriminant analysis: The performance of combining modelsPublication . Marques, Anabela; Ferreira, Ana Sousa; Cardoso, MargaridaThe idea of combinig models in Discrete Discriminant Analysis (DDA) is present in a growing number of papers which aim to obtain more robust and more stable models than any of the competing ones. This seems to be a promising approach since it is known that different DDA models perform differently on different subjects [1]. This is a particularly relevant issue when the groups are not well separeted, which often occurs in practice. recently, a new methodological approach was proposed based on a linear combination of the First-order Independence Model (FOIM) and the Dependence trees Model (DTM) ([3] and [2]). In the present work we further explore the referred approach. Since FOIM assumes that the P discrete predictive variables are independent in each group and DTM takes the predictors relationships into account, we think that the proposed approach could be sucessfully applied to many real situations. In order to evaluate its performance, we consider both real and simulated data. Furthermore we present comparisons with alternative models performance. According to the training sample size the leave-one-out approach, v-fold cross validation or assessing the error rate in a test sample are considered. The MATLAB software is used for the algorithms' implementation.
- Resultados de uma Escala de Sugestionabilidade: Classificação em grupos demográficosPublication . Marques, Anabela; Ferreira, Ana Sousa; Cardoso, Margarida; Pires, RuteA natureza imperfeita dos processos de recuperação da memória, nomeadamente o esquecimento e as distorções, tem importantes implicações na psicologia clínica e forense. A GSS1-Escala de Sugestionabilidade de Gudjonsson foi desenvolvida para avaliar a tendência que algumas pessoas têm para ceder perante questões falaciosas quando entrevistadas. Neste trabalho comparam-se os resultados de diversas técnicas de análise discriminante, no sentido de estudar a associação entre a sugestionabilidade e algumas características demográficas dos inquiridos.
- Combining models in discrete discriminant analysisPublication . Marques, Anabela; Ferreira, Ana Sousa; Cardoso, MargaridaDiverse Discrete Discriminant Analysis (DDA) models perform differently on different sample observations (Brito et al. (2006)). This fact has encouraged research in combined models for DDA. This research seems to be specially promising when the a priori classes are not well separated or when small or moderate sized samples are considered, which often occurs in practice. In this work we evaluate the performance of a linear combination of two DDA models (Marques et al. (2008)): the First-Order Independence Model (FOIM) and the Dependence Trees Model (DTM) (Celeux and Nakache (1994). The pro- posed methodology also uses a Hierarchical Coupling Model (HIERM) when addressing multiclass classification problems, decomposing the multiclass problems into several bi-class problems, using a binary tree structure (Sousa Ferreira (2000)). The analysis is based both on simulated and real datasets. Results include measures of precision regarding a training set, a test set and cross-validation. The R software is used for the algorithm's implementation.
- Análise discriminante dos públicos do Centro Cultural de BelémPublication . Marques, Anabela; Ferreira, Ana Sousa; Cardoso, MargaridaO trabalho apresentado refere-se ao uso de combinação de modelos em Análise Discriminante Discreta, no sentido de diferenciar classes de públicos do Centro Cultural de Belém. É efectuada uma análise de sensibilidade associada ao coeficiente da combinação linear dos modelos de Independência Condicional (MIC) e Gráfico Decomponível (MGD). São ainda utilizadas medidas alternativas para a avaliação dos erros de classificação.
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