Outliers Statistics
Mostrando 1-6 de 6 artigos, teses e dissertações.
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1. O uso de quase U-estatísticas para séries temporais uni e multivaridas / The use of quasi U-statistics for univariate and multivariate time series
Classifcation and clustering of time series are problems widely explored in the current literature. Many techniques are presented to solve these problems. However, the necessary restrictions in general, make the procedures specific and applicable only to a certain class of time series. Moreover, many of these approaches are empirical. We present methods for
Publicado em: 2011
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2. Variabilidade espacial da matéia orgânica em um latossolo vermelho-amarelo sob cafeeiro conilon
The aim of this study was to evaluate the spatial variability of total organic carbon and organic carbon of humic substances in an Oxisol under conilon coffee in plains, which were planted in different periods of time. The study was conducted in an area which belongs to Espírito Santo State Research, Technical Assistance and Rural Extension (INCAPER), locat
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 17/12/2010
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3. Influence diagnostics in stochastic volatility models / Diagnostico de influencia em modelos de volatilidade estocastica
Model diagnostics is a key step to assess the quality of fitted models. In this sense, one of the most important tools is the analysis of influence. Peña (2005) introduced a way of assessing influence in linear regression models, which evaluates how each point is influenced by the others in the sample. This diagnostic strategy was adapted by Hotta and Motta
Publicado em: 2009
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4. Restrições da correlação nos testes de germinação de sementes e emergência de plântulas / Restrictions of the correlation in the tests of seed germination and seedling emergence
Coefficient of Pearson r is used to compare scientific tests. In seeds technology it is used to compare results of procedures that measure vigour. When the correspondly similar results are not found in very similar conditions, Persons correlation faces criticism mainly due to two factors. The first one comes from statistics for whose usage of Persons correla
Publicado em: 2006
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5. Statistics review 1: Presenting and summarising data
The present review is the first in an ongoing guide to medical statistics, using specific examples from intensive care. The first step in any analysis is to describe and summarize the data. As well as becoming familiar with the data, this is also an opportunity to look for unusually high or low values (outliers), to check the assumptions required for statist
BioMed Central.
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6. On a notion of simplicial depth
For a distribution F on Rp and a point x in Rp the simplicial depth D(x), which is the probability that x be inside a random simplex whose vertices are p + 1 independent observations from F, is introduced. D(x) can be viewed as a measure of depth of the point x relative to F, and its empirical version gives rise to a natural ordering of the data points from