Longitudinal Analysis for macthed series osf studies

In the first phase of the STATIS methodology the information is contained in a series of studies is first condensed into a symmetric matrix. Models based in the spectral analysis of their mean matrices were developped,see Areia et al.(2008). When their first engenvalue is dominant a further condensation of the information into a structure vector, with the eigenvector associated to and a sum of square of residues is carried out. This enables the joint analysis of matched series of studies associated to the treatments of a base design. Then in the longitudinal analysis of such families of series we study the action of the factors in the base design (contrasts)taken for the components of the structure vectors. An application to elections in Portugal is presented

Séries emparelhadas de estudos: estrutura comum inferência

Nesta dissertação procuramos desenvolver a teoria da inter-estrutura da metodologia STATIS para séries emparelhadas de estudos. As séries de estudos são emparelhadas quando existem bijecções entre os estudos das séries. Utilizando a abordagem de Escoufier (1973) consegue-se uma representação geométrica dos k estudos de uma série com pontos em Rk. Quando esses pontos se encontram próximos de um sub-espaço com dimensão h < k a série terá estrutura comum de grau h. Até agora (ver Oliveira e Mexia (1999a e 1999b), Oliveira (2002) e Ramos (2006)) apenas foram consideradas séries com estrutura comum de grau um. A nossa abordagem assenta na teoria da "normalidade aproximada" que se apresenta no início da dissertação. Podemos assim realizar inferência com o objectivo de analisar séries individuais e séries emparelhadas de estudos. No caso das séries emparelhadas, admitimos que as mesmas correspondem aos tratamentos de um delineamento base. Mostramos como analisar a influência dos factores do delineamento base sobre as séries. Neste estudo consideramos dois tipos de análise: −A análise longitudinal, em que se consideram medidas de evolução das séries; −A análise transversal, em que se consideram simultâneamente estudos homólogos das várias séries. A concluir, aplicamos os nossos resultados às eleições autárquicas de 1985 a 2001, em 16 concelhos de Portugal Continental. Estes concelhos pertencem a dois quartetos de distritos, um situado ao longo da Costa e outro na fronteira com Espanha. Em cada distrito considerou-se, para além da capital, outro concelho. Teve-se assim em conta três factores: latitude, longitude e relevância administrativa. /ABSTRACT- In this dissertation, we seek to develop the theory of the STATIS methodology inter-structure for matched series of studies. The study series are matched when there are bijections between the studies of the series. Using the Escoufier (1973) approach a representation of the k studies of a series with points in Rk is obtained. When those points are close to a sub-space with an h < k dimension the series will have an h degree common structure. Until now (see Oliveira and Mexia (1999a and 1999b), Oliveira (2002) and Ramos (2006)), only series of degree one common structures were considered. Our approach rests on the theory of the "approximate normality" which is presented in the beginning of the dissertation. We can thus carry out inference with the objective of analysing individual series of studies as well as matched ones. In the case of matched series, we admit that the same correspond to the treatments of a base design. We show how to analyse the influence of the factors of the base design on the series. In this study, we consider two types of analyses: −The longitudinal analysis, where evolution measures of the series are considered; − The transversal analysis, where simultaneous homologous studies of the various series are considered. Finally, we apply our results to the local elections (non-governmental elections) from 1985 to 2001 for 16 townships in Mainland Portugal. These townships belong to two quartets of districts, one situated along the Coast and the other along the border with Spain. In each district, besides the capital, one other municipality was considered. Three factors were thus taken into account: latitude, longitude, and administrative relevance

As bases de dados e a problemática da segurança

Mestrado em Matemática Aplicada à Economia e à GestãoO presente trabalho tem como objectivo perspectivar os principais . problemas na concepção, construção, utilização e manutenção das Bases de Dados e dar relevo às normas de segurança e de protecção da informa­ ção e do software durante os ciclos de exploração das aplicações informá­ ticas, de acordo com os sistemas de informação das unidades económicas, bem como enunciar as principais características de alguns Sistemas de Gestão de Bases de Dados. Mostramos o carácter obsoleto e pouco prático da utilização dos ficheiros de dados tradicionais, por oposição às vantagens do sistema · de informação apoiado em Base de Dados. Pretendemos ainda mostrar como se estruturam os dados, se actualizam e se consultam, segundo os modelos Relacional, Hierárquico e Hierárquico em Rede. Relativamente ao modelo Relacional, para eliminar, entre outros problemas, a redundância e a perda de informação, é efectuado o recurso às Formas Normalizadas que são baseadas nas Dependências Funcionais. No que se refere aos Sistemas de Gestão de Bases de Dados Distribuídas, abordamos os diferentes tipos, os objectivos, algumas vanta­ gens e inconvenientes da sua implementação. A nível de segurança tratamos alguns aspectos relacionados com a segurança física das instalações e dos equipamentos, o modo corno podem ser controlados os acessos aos sistemas, como se deve efectuar a salva­ guarda dos dados e a manutenção do sistema informático. São também enunciados alguns métodos de controlo de concorrên­ cia no acesso aos dados, baseados no bloqueio e no "timestamping", e . a recuperaração do sistema informático em função de avarias e/ou anoma­ lias. Em função do mercado existente em Portugal sobre Sistemas de Gestão de Bases de Dados, elaboramos algumas das características desses sistemas de acordo com a documentação disponibilizada pelos vários fornecedores.The main objectives of this work are to put into perspective t h e principal problems in the conception, construction, utilization and maintenance of Databases and to emphasize the security and the protection of information and software during the different usage cycles of the computer applications according to the information systems of the economic units. As well, the principal characteristics of some Database Management systems will be highlighted. In order to contrast the advantages of an information system linked to a database, the obsolete and unpractical character of the use of traditional data files are shown, as well as how to structure, update and consult data according to Relational, Hierarchical and Hierarchical Network Models. With regard to the Relational model, in order to eliminate, among other problems, redundancy and the loss of information, this work reverts to the use of normalized forms based on functional dependancies. With reference to the distributed Database Management Systems, the various types, objectives, advantages · and inconveniences of their implementation have been covered. Some aspects related to the physical security . of the building and equipment have also been discussed as well as how access to the s ystem can be controlled, how to safeguard the data and the maintenance of the computer system. Methods to control the access to the data by the compeuuon have also been outlined. These are based on blocking and timestamping. We have also shown methods for the recovery of the information system in the event of a breakdown or any other anomaly. We have elaborated some of the characteristics of the Database Management Systems available on the portuguese market based on the documentation made available by severa! suppliers.N/

Complete and sufficient statistics and perfect families in orthogonal and error orthogonal normal models

Sem PDF. Fundacao para a Ciencia e a Tecnologia (Portuguese Foundation for Science and Technology) through Centro de Matematica e Aplicacoes (PEst-OE/MAT/UI0297/2014)We will discuss orthogonal models and error orthogonal models and their algebraic structure, using as background, commutative Jordan algebras. The role of perfect families of symmetric matrices will be emphasized, since they will play an important part in the construction of the estimators for the relevant parameters. Perfect families of symmetric matrices form a basis for the commutative Jordan algebra they generate. When normality is assumed, these perfect families of symmetric matrices will ensure that the models have complete and sufficient statistics. This will lead to uniformly minimum variance unbiased estimators for the relevant parameters.publishe

The DPOBE Model for Organizational Sustainability: An Exploratory Study about its Structure, Pillars and Components among a Group of Master Degree Students

Research purpose. To get a validation of the structure, pillars and components that seem to be central, and under which, business management and managers need to develop abilities and competences to ensure the sustainability of their organizations according to the ‘DPOBE Model for Organizational Sustainability’ structure