ESTGV - DMAT - Documentos de congressos (comunicações, posters, actas)
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- Segmenting Travelers Based on the Use of Travel Social MediaPublication . Amaro, Suzanne; Duarte, Paulo; Henriques, CarlaThe popularity of social media among travelers has been highly recognized by research addressing this issue. Research has mainly focused on the role and impact of social media on travelers’ travel planning process and there is consensus that travel decisions are highly influenced by social media websites. Yet, little attention has been paid to the differences among travelers regarding their use of social media for travel purposes. Based on the use of travel social media websites, cluster analysis was employed to identify different segments among travelers. Furthermore, the study profiles the clusters based on demographic and other travel related characteristics. The findings of this study are important to online marketers to better understand traveler’s use of social media and their characteristics, in order to adapt online marketing strategies according to the profile of each segment. Given the popularity of social media among travelers, it is imperative that researchers and practitioners continue to deeper the understanding of social media users. The study provides practical and theoretical contributions. Future research is also suggested in order to further develop the contributions and take in account the limitations of this study.
- Statistics in medicine: case studiesPublication . Matos, A.; Henriques, C.ABSTRACT. Successful research involves the creation of interdisciplinary teams. The collaboration of statisticians and physicians is an example. In this talk we will show two case studies. The first shows how it was possible to contribute to concede the non accuracy of ultrasonography in the diagnosis of acute cholecystitis in the presence of acute pancreatitis and thus contribute to a better clinical diagnosis that will determine the therapy to adopt. The study enrolled 120 patients with acute pancreatitis. The patients were divided into two groups: the first group of patients for whom the result of the ultrasonography was negative for acute cholecystitis (77 patients); the second group included the patients with positive result in the ultrasonography (43 patients). Statistical analyzes were conducted illustrating the inaccuracy of ultrasonography alone in the diagnosis of acute cholecystitis [1]. The second case involves an observational study of protein expression, human hepcidin, in liver tissue of patients with alcoholic liver disease (DHA) and of healthy individuals. It involved 61 patients with DHA and 20 healthy controls. This work contributes to a better clarification of the mechanism that stimulates increased iron levels in patients with DHA. This talk is based in joint work with Carla Henriques of the Polytechnic Institute of Viseu, Jorge Pereira, Catarina Afonso and Luis Matos Costa of the Tondela-Viseu Hospital Center.
- Developing marketing capabilities through export commitment and innovativenessPublication . Malva, Madalena; Vicente, Margarida; Antunes, Maria JoséThis research examines how marketing capabilities, technological capabilities, and organizational innovation influence export performance. More specifically, we examine the impact of marketing and technological capabilities on organizational innovation and the influence of organizational innovation on export performance. We investigate the mediating role of organizational innovation in the relationships between these two capabilities (i.e. marketing and technological capabilities) and export performance. Survey data of 471 exporting manufacturing firms based in Portugal was used to test the relationships between the constructs analyzed in this study. The findings demonstrate that marketing and technological capabilities have a significant effect on organizational innovation intensity, which in turn has a positive impact on export performance. Organizational innovation positively mediates the relationships between marketing and technological capabilities and export performance. Furthermore, the results show that marketing capabilities have a stronger impact on organizational innovation and export performance than technological capabilities. Implications for scholars and practitioners are discussed along with suggestions for future research.
- Satisfaction and Service Quality and Life in the institutions for seniorsPublication . Malva, Madalena; Antunes, Joaquim; Pereira, VâniaThe socio-demographic changes justified the increase number of studies related to population aging; the increase in the elderly population has led to many social changes, which seek through new and improved services to meet the needs of this population. This study sought to understand user satisfaction in elderly homes adding two constructs: the quality of Parasuraman services, Zeithaml and Berry (1988) and the quality of life of Kane (2003) These play an important role in the management of organizations having a significant weight in the strategic and operational decisions that influence the quality of services provided (Hespanhol, 2008; Escoval & Ferreira, 2010). For the first time, these constructs were analyzed together in order to see whether the part of the services or the part of the quality of life contribute more to the satisfaction of residents in institutions for seniors. The study was carried out to 209 users institutionalized in elderly homes, protected by the Social Security or private nature in Viseu county. The results allow us to verify a set of relationships between variables related to quality of service and the quality of life in user satisfaction.
- Dispersion Index, Panjer Stopped Sums, and Variance of MixturesPublication . Malva, Madalena; Mendonça, Sandra; Pestana, Dinis; Sequeira, Fernando
- A utilização dos Mídia Social para efeitos de viagem: Uma abordagem a partir da análise de agrupamentoPublication . Henriques, Carla; Amaro, Suzanne; Duarte, PauloAs decisões tomadas no processo de compra de viagens são cada vez mais influenciadas pelos mídia social. Deste modo, é crucial que as empresas turísticas conheçam os seus potenciais clientes quanto ao seu perfil de uso de mídia social, por forma a adaptarem as suas estratégias. Neste trabalho, recorrendo a técnicas de análise de agrupamento, identificam-se cinco segmentos entre os viajantes, tendo em conta a sua utilização dos mídia social para efeitos de viagens.
- Statistical Modelling in Health: Some Case StudiesPublication . Henriques, Carla; Matos, Ana Cristina; Santos, Luis Ferreira; Faria, BernardoThis presentation focus on two examples of applications of Statistics in the field of Medicine. Research questions are posed by health professionals. The answers are not always straightforward, and the difficulties show up with different forms. In the first case study, the objective was to find a panel of biomarkers that would be useful to predict the course of a kidney disease – Immunoglobulin A nephropathy (IgAN). The study could confirm the predictive role of some of the established risk factors for disease progression and also suggests a combination of two histological biomarkers (C4d and CD3) to predict IgAN progression. In the second example we move to the area of cardiology, looking for a model that could be a valuable adjuvant in the diagnosis of Brugada Syndrome. A set of five electrocardiographic markers were identified and their linear combination was explored in order to find one that could be a reliable tool in Brugada Syndrome diagnosis. This talk is based in joint work with Ana Cristina Matos, of the Polytechnic Instituto of Viseu, Luís Ferreira dos Santos of the Tondela-Viseu Hospital Center, and Bernardo Faria of the Nephrology and Infectious Disease R&D Group, INEB, I3S, University of Porto, Porto.
- O Teste do Sinal para Amostras AssociadasPublication . Henriques, Carla; OLiveira, PauloEm Dewan e Prakasa Rao (2005) é estabelecida a normalidade assimptótica da estatística do teste do sinal para amostras associadas. Contudo, este resultado depende da variância da distribuição limite, sigma2, que em geral não é conhecida, pois incorpora as distribuições conjuntas das variáveis de base. Recorrendo aos resultados de Henriques e Oliveira (2006, 2008), estima-se sigma e obtém-se a normalidade assimptótica da estatística que recorre à estimação de sigma. Neste trabalho apresentam-se alguns resultados de um estudo de simulação levado a cabo com o objetivo de avaliar a aproximação à Normal das estatísticas de teste precedentes. Serão analisadas as caudas e a distribuição global das estatísticas de teste e é ilustrado o comportamento do estimador da variância sigma2.
- Mortalidade nos Idosos numa Unidade de Cuidados Intensivos: A idade não explica tudo!Publication . Henriques, Carla; Matos, Ana Cristina; Porto, LéneaEste trabalho centra-se no estudo comparativo da população idosa e não idosa na Unidade de Cuidados Intensivos (UCI) do Centro Hospitalar Tondela-Viseu, tendo como objetivo identificar fatores de influência na sobrevivência dos pacientes da UCI, diferenciando idosos de não idosos, e procurando esclarecer o que influência o desfecho final (morte ou sobrevida). Analisou-se a associação deste desfecho com a proveniência do paciente e verificou-se que o risco de morte era maior nos pacientes com tipo de admissão Médico (tratamento médico). Quanto à terapêutica na UCI, muitas delas revelaram-se significativamente associadas com o desfecho final, destacando-se a terapêutica substitutiva de função renal e a terapêutica aminérgica como as mais agravantes quanto ao risco de morte, quer entre idosos quer entre não idosos. Verificou-se também que a idade exata do paciente não é significativamente determinante da morte/sobrevida nos idosos, embora seja nos não idosos, o mesmo acontecendo com o score de comorbilidades segundo o índice de Charlson.
- A ecografia como instrumento de diagnóstico – um caso de estudoPublication . Matos, A.; Henriques, C.; Pereira, J.; Afonso, A.; Constantino, J.Equipas interdisciplinares estão na base do sucesso de muitos trabalhos de investigação. Um exemplo disso é a colaboração da estatística com as ciências da saúde. Neste trabalho, recorrendo a testes não paramétricos e a modelos de regressão logística, foi possível contribuir para o conhecimento da não acuidade, da ecografia no diagnóstico de colecistite aguda na presença de pancreatite aguda. Deste modo, este estudo contribui para um melhor diagnóstico clínico que será determinante na terapêutica a adotar.