Constantino Lagoa: In this talk, we discuss some preliminary results on a general approach to chance constrained algebraic problems. In this type of problems, one aims at maximizing the probability of a set defined by polynomial inequalities. This class of problems is quite general and includes many problems in control systems where the system of interest is subject to stochastic disturbances and/or random unce...
The present work aims to propose a systematic study and interpretation of a variable response in relation to three factors, using a model of Joint Table Analysis, the Tucker3 model, as well as the joint biplot graph. The proposed method seems efficient and suitable for separating standard technical response, and the pattern of noise contained in a three inputs table, as well as allows its interpretation. The jo...
Pretende-se com o presente texto, uma abordagem aos principais tópicos usualmente desenvolvidos em Estatística Descritiva, para apoio ao módulo introdutório sobre Estatística Descritiva inserido na unidade curricular de Matemática do Curso de Qualificação para Estudos Superiores da Universidade Aberta. O principal objetivo é fornecer e/ou relembrar um conjunto de conceitos, habitualmente adq...
The importance of randomization tests is very well known in experimental research, particularly in biometry. The aim of the resent research is to evaluate the impact of distributional shape on the power of the randomization test for difference between the means of two independent groups (with n1=n2=16). To manipulate shape in terms of asymmetry and kurtosis, we used g-and-h distributions. We evaluated the pow...
In Service Industry the main goal of Data Mining is to improve the Quality of the interface and the interaction between the organization system and the respective costumers and needs. Now-a-days with the technological advances, a new challenge on exploring data and extrapolating patterns has emerged. Data mining, as an exploratory data analysis tool used in large and complex data sets, allow discovering new sni...
The importance of randomization tests is very well known in experimental research, particularly in biometry. The aim of the present research is to evaluate the impact of distributional shape on the power of the randomization test for difference between the means of two independent groups (with n 1 =n 2 =16). To manipulate shape in terms of asymmetry and kurtosis, we used g-...
Dissertação de Mestrado em Ambiente, Saúde e Segurança. ; A eco-eficiência é, talvez, a melhor ferramenta para qualquer organização responder aos desafios do desenvolvimento sustentável e às ameaças da crise ambiental que se vive e que tem tendência a agravar-se. Avaliar e controlar os indicadores de desempenho de uma organização nem sempre é tarefa fácil. Os elementos de comparação disponíveis estão muito dis...
Joint Regression Analysis (JRA) is based in linear regression applied to yields, adjusting one linear regression per cultivar. The environmental indexes in JRA correspond to a non observable regressor which measures the productivity of the blocks in the field trials. Usually zig-zag algorithm is used in the adjustment. In this algorithm, minimizations for the regression coefficients...
Tese de Doutoramento em Matemática na especialidade de Modelação Estatística apresentada à Universidade Aberta ; A Análise Conjunta de regressões, ACR, tem sido uma técnica bastante utilizada no domínio da avaliação de cultivares. O principal objectivo desta dissertação é a extensão da aplicação da técnica ACR, na medida em que passamos duma análise usual, em que se tem em atenção apenas as produções de cada c...
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