Consulta: subjectFacets:"Data analysis"
Registros recuperados: 15
Data/hora: 13/06/2024 06:03:37

Use of signal thresholds to determine significant changes in microarray data analyses
Provedor de dados: 74
Autores: Xinmin,Li; Kim,Jaejung; Zhou,Jian; Gu,Weikuan; Quigg,Richard.
The use of a constant fold-change to determine significant changes in gene expression has been widely accepted for its intuition and ease of use in microarray data analysis, but this concept has been increasingly criticized because it does not reflect signal intensity and can result in a substantial number of false positives and false negatives. To resolve this dilemma, we have analyzed 65 replicate Affymetrix chip-chip comparisons and determined a series of user adjustable signal-dependent thresholds which do not require replicates and offer a 95% confidence interval. Quantitative RT-PCR shows that such thresholds significantly improve the power to discriminate biological changes in mRNA from noise and reduce false calls compared to the traditional...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Microarray; Signal threshold; Affymetrix; Data analysis.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572005000200002

Transferência de tecnologia, agricultura familiar e desenvolvimento local: a experiência do Projeto Silvânia.
Provedor de dados: 14
Autores: ZOBY, J. L. F.; XAVIER, J. H. V.; GASTAL, M. L.
ABSTRACT: The rural development has been associated to the modernization of the agriculture by the use or incorporation of new technologies to the productive process. However, it cannot just be faced as fruit of technological change, because the own adoption of technologies is dependent of external factors to the rural establishments. This work discusses the methodology used in the Project "The utilization of R&amp;D approach for the development of the small agriculture in the area of Silvânia-GO", usually known as "Projeto Silvânia". The R&amp;D approach can be defined as the experimentation in real scale and in collaboration with the farmers for the improvements technical, economical and social of the production systems and of the modalities of...
Tipo: Documentos (INFOTECA-E)
Palavras-chave: Produtor rural; Organização; Projeto Silvânia; Innovation; Diagnosis.; Adoção de Inovações; Agricultura Familiar; Análise de Dados; Desenvolvimento Rural; Diagnostico; Inovação; Pequeno Produtor; Transferência de Tecnologia.; Sistema de Produção; Farmers; Data analysis; Family farms; Farming systems; Innovation adoption; Small farms; Rural development; Technology transfer.
Ano: 2003
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/559742

Algoritmos no comando das nossas vidas.
Provedor de dados: 14
Autores: LOPES, M. A.
Algoritmos fazem, cada vez mais, parte das nossas vidas, razão por que precisamos entender o que são e as possibilidades que nos oferecem. Esse é um campo do conhecimento que vem alcançando avanços vertiginosos nos últimos anos, a ponto de muitos afirmarem que o futuro pertence aos algoritmos, que estarão no comando de indústrias, do comércio, de veículos autônomos e até de robôs que mimetizarão seres humanos nas mais variadas atividades.
Tipo: Artigo de divulgação na mídia (INFOTECA-E)
Palavras-chave: Inteligência artificial; Análise de Dados; Dado; Tecnologia da Informação; Data analysis; Algorithms; Information technology; Artificial intelligence.
Ano: 2019
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1123785

Tecnologia e inovação no redesenho da globalização.
Provedor de dados: 14
Autores: LOPES, M. A.
A conectividade, viabilizada por tecnologias e infraestrutura de transporte e comunicações, e também por relações de comércio, tem influência sobre praticamente todos os povos, culturas e mercados. Uma de suas consequências é a globalização, ou a integração gradual de regiões, países e pessoas.
Tipo: Artigo de divulgação na mídia (INFOTECA-E)
Palavras-chave: Inteligência artificial; Tecnologia da Informação; Inovação; Comunicação; Análise de Dados; Communications technology; Information technology; Data analysis.
Ano: 2019
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1123805

Avaliação do desempenho reprodutivo do rebanho leiteiro do Estado de Rondônia: formação e gestão de banco de dados.
Provedor de dados: 14
Autores: PFEIFER, L. F. M.; BRITO, L. G.; ARAGÃO, J. L. de; ALVES, J. R.
Para que o produtor se adapte aos novos moldes de produção, um intenso controle sobre os dados do rebanho deve ser empregado nos sistemas de produção de leite. Além de produzir com eficiência, sustentabilidade ambiental, responsabilidade social e sem desperdícios é preciso desenvolver habilidades no gerenciamento e motivação de pessoas para comprar insumos, na venda da produção e na gestão adequada dos custos. Desta forma, há necessidade que o produtor desenvolva ferramentas e práticas de monitoramento de seus dados para processar, interpretar e transformá–los em informação. Vários fatores afetam o registro e gestão dos dados da fazenda. O efetivo uso de registros representa um “divisor de águas” na medicina moderna do gado de leite. A coleta de dados...
Tipo: Documentos (INFOTECA-E)
Palavras-chave: Rondônia; Amazônia Ocidental; Western Amazon; Amazônia Occidental.; Reprodução Animal; Gado Leiteiro; Eficiência Reprodutiva; Base de Dados.; Análise de Dados; Animal performance; Reproductive efficiency; Dairy cattle; Animal reproduction; Databases.; Data analysis.
Ano: 2011
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/922552

Dados meteorológicos obtidos por estação automática.
Provedor de dados: 14
Autores: PACHECO, N. A.; BASTOS, T. X.
bitstream/item/52961/1/PesquisaAnd0100001.pdf
Tipo: Séries anteriores (INFOTECA-E)
Palavras-chave: Dado meteorologico; Estação automática; Dynamet; Pará; Brasil.; Análise de Dados; Instrumento Meteorológico.; Amazonia; Data analysis; Meteorological data; Meteorological instruments.
Ano: 1999
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/375143

A novel "Integrated Biomarker Response" calculation based on reference deviation concept
Provedor de dados: 5
Autores: Sanchez, Wilfried; Burgeot, Thierry; Porcher, Jean-marc.
Multi-biomarker approaches are used to assess ecosystem health and identify impacts of environmental stress on organisms. However, exploration of large datasets by environmental managers represents a major challenge for regulatory application of this tool. Several integrative tools were developed to summarize biomarker responses. The aim of the present paper is to update calculation of the "Integrated Biological Response" (IBR) described by Beliaeff and Burgeot (Environ Toxicol Chem 21:1316-1322, 2002) to avoid weaknesses of this integrative tool. In the present paper, a novel index named "Integrated Biological Responses version 2" based on the reference deviation concept is presented. It allows a clear discrimination of sampling sites as for the IBR, but...
Tipo: Text
Palavras-chave: Biomarkers; Data analysis; Graphic tools; Three-spined stickleback.
Ano: 2013
URL: https://archimer.ifremer.fr/doc/00139/25069/23191.pdf

IOC/GLOSS-GOOS: Training Workshop on Sea-Level Data Analysis. South Africa 16-27 Nov 1998
Provedor de dados: 20
The main body of the Workshop was devoted to fromal presentations, discussions and hands-on training in sea-level measurements and analysis. In addition, two days of field excursions were undertaken, and a programme of social events took place; The detail of the Workshop Programme can be found in Annex I, whilst a list of course facilities and reference materials can be found in Annex III
Tipo: Working Paper
Palavras-chave: Data analysis; Sea level data.
Ano: 1999
URL: http://hdl.handle.net/1834/400

Downy mildew incidence on pearl millet cultivars and pathogenic variability among isolates of Sclerospora graminicola in Rajasthan
Provedor de dados: 30
Autores: Rao, V.P.
Palavras-chave: Millets; Hybrids; Data analysis; Fungi; Pathogens; Genetic variation; Replication; Humus; Wet season; Land resources.
Ano: 2005
URL: http://agropedia.iitk.ac.in/openaccess/?q=node/3235

R-environment package for regression analysis
Provedor de dados: 86
Autores: Arnhold,Emmanuel.
Abstract: The objective of this work was to develop a package in the R environment for automating and facilitating the regression analysis. Named easyreg, the package offers five functions. The er1 function performs analyses in 13 models, including linear, nonlinear, and mixed models. The er2 function considers the lack of fit in the analyses and in the following designs: completely randomized, randomized complete block, Latin squares, and repeated Latin squares. The regplot function generates graphics; the bl function estimates two-segment models; and the regtest function tests the equality of parameters and the identity of the models. These functions allow of a great number of analyses and confer practicality and versatility to the regression analysis.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Data analysis; Equality of parameters; Experimental designs; Lack of fit; Mixed models; Model identity.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2018000700870

Identifying falsified clinical data
Provedor de dados: 31
Autores: Lee,   Joanne; Judge,   George G.
Clinical data serve as a necessary basis for medical decisions. Consequently, the importance of methods that help officials quickly identify human tampering of data cannot be underestimated. In this paper, we suggest Benford’s Law as a basis for objectively identifying the presence of experimenter distortions in the outcome of clinical research data. We test this tool on a clinical data set that contains falsified data and discuss the implications of using this and information-theoretic methods as a basis for identifying data manipulation and fraud.
Tipo: Working or Discussion Paper
Palavras-chave: Data collection; Data analysis; Research; Benford's Law; Health Economics and Policy; Research and Development/Tech Change/Emerging Technologies.
Ano: 2008
URL: http://purl.umn.edu/47001

An information based sample-selection estimation model of agricultural workers' choice between piece-rate and hourly work
Provedor de dados: 31
Autores: Golan,   Amos; Moretti,   Enrico; Perloff,   Jeffrey M.
This paper presents a new generalized maximum entropy (GME) approach to estimation of sample-selection models with small data sets, such as are found in many empirical agricultural economic analysis. For small samples, the GME approach produces more stable estimates and has smaller mean square error measures than other well-known estimators such as ordinary least squares, Heckman's two-step method, full-information maximum likelihood, and Ahn and Powell's method. The technique is used to analyze whether hired agricultural workers will work in piece-rate or time-rate jobs and to compare female-male wage differentials for both types of jobs.
Tipo: Working or Discussion Paper
Palavras-chave: Agricultural labor; Agricultural wages; Data analysis; Entropy; Monte carlo analysis; Piece rates; Labor and Human Capital.
Ano: 1998
URL: http://purl.umn.edu/47285

Review of The Workflow of Data Analysis Using Stata, by J. Scott Long
Provedor de dados: 31
Autores: Acock,   Alan C.
This article reviews The Workflow of Data Analysis Using Stata, by J. Scott Long.
Tipo: Article
Palavras-chave: Data analysis; Workflow; Data management; Wdaus; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/122707

Review of Data Analysis Using Stata by Kohler and Kreuter
Provedor de dados: 31
Autores: Schumm,   L. Philip.
This article reviews Data Analysis Using Stata by Kohler and Kreuter.
Tipo: Journal Article
Palavras-chave: Data analysis; Introductory; Teaching; GSOEP; Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/117549

Clinical signs of pneumonia in children: association with and prediction of diagnosis by fuzzy sets theory
Provedor de dados: 56
Autores: Pereira,J.C.R.; Tonelli,P.A.; Barros,L.C.; Ortega,N.R.S.
The present study compares the performance of stochastic and fuzzy models for the analysis of the relationship between clinical signs and diagnosis. Data obtained for 153 children concerning diagnosis (pneumonia, other non-pneumonia diseases, absence of disease) and seven clinical signs were divided into two samples, one for analysis and other for validation. The former was used to derive relations by multi-discriminant analysis (MDA) and by fuzzy max-min compositions (fuzzy), and the latter was used to assess the predictions drawn from each type of relation. MDA and fuzzy were closely similar in terms of prediction, with correct allocation of 75.7 to 78.3% of patients in the validation sample, and displaying only a single instance of disagreement: a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Epidemiologic methods; Stochastic models; Fuzzy models; Clinical signs; Diagnosis; Data analysis.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2004000500012