Skewness
Mostrando 1-12 de 64 artigos, teses e dissertações.
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1. Estimating Poisson pseudo-maximum-likelihood rather than log-linear model of a log-transformed dependent variable
Abstract Purpose The purpose of this study is to account for a recent non-mainstream econometric approach using microdata and how it can inform research in business administration. More specifically, the paper draws from the applied microeconometric literature stances in favor of fitting Poisson regression with robust standard errors rather than the OLS lin
RAUSP Manag. J.. Publicado em: 13/12/2019
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2. Numerical Simulation of a Pitching Airfoil Under Dynamic Stall of Low Reynolds Number Flow
ABSTRACT: In this research, viscous, unsteady and turbulent fluid flow is simulated numerically around a pitching NACA0012 airfoil in the dynamic stall area. The Navier-Stokes equations are discretized based on the finite volume method and are solved by the PIMPLE algorithm in the open source software, namely OpenFOAM. The SST k - ω model is used as the tur
J. Aerosp. Technol. Manag.. Publicado em: 14/11/2019
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3. Vigor and mortality of citrus progenies with potential use as rootstocks
ABSTRACT: Rootstocks influence certain characteristics of the scion, such as vigor, fruit yield and quality, and tolerance to biotic and abiotic factors. In conventional citrus breeding programs, hybridization is the main method used for obtaining rootstock varieties. Between Sept and Oct 2006, controlled pollinations were carried out resulting in nine proge
Sci. agric. (Piracicaba, Braz.). Publicado em: 2018-08
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4. Diameter distribution in a Brazilian tropical dry forest domain: predictions for the stand and species
ABSTRACT Currently, there is a lack of studies on the correct utilization of continuous distributions for dry tropical forests. Therefore, this work aims to investigate the diameter structure of a brazilian tropical dry forest and to select suitable continuous distributions by means of statistic tools for the stand and the main species. Two subsets were rand
An. Acad. Bras. Ciênc.. Publicado em: 2017-06
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5. Dental Management Survey Brazil (DMS-BR): creation and validation of a management instrument
Abstract Questionnaires for the assessment of knowledge and self-perception can be useful to diagnose what a dentist knows about management and administration. The aim of the present study was to create and validate the Dental Management Survey Brazil (DMS-BR) scale, based on meetings with experts in the field. After having elaborated the first version, 10 a
Braz. oral res.. Publicado em: 10/04/2017
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6. A classification proposal for coefficients of variation in Eucalyptus experiments involving survival, growth and wood quality variables
ABSTRACT The objective of this study was to present a classification proposal for coefficients of variation (CV) in Eucalyptus experiments, aiming at providing a useful tool for experiments involving growth, survival and wood quality traits. Ninety-four studies were selected from a search for peer-reviewed journals yielding a total of 508 data. The CVs were
Bragantia. Publicado em: 06/05/2016
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7. Spatial distribution of feces and estimates of nitrogen return by dairy cows on mombasa grass pastures
The objective of this study was to identify the pattern of deposition of feces by supplemented crossbred dairy cows after the lactation peak on cultivated areas under levels of intensification of the system and its effects on nitrogen cycling, with the aid of geostatistics, in the rainy period. Treatments were composed of two levels of nitrogen fertilization
R. Bras. Zootec.. Publicado em: 2013-05
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8. Demography and structures population of Actinostemon concolor (Spreng.) Müll. Arg. (Euphorbiaceae) in flooded areas in Southern Brazil
The aim of this work was to analyze the size and spatial structures and demography of Actinostemon concolor (Spreng.) Müll. Arg. (Euphorbiaceae) in the flooded areas of Mata dos Godoy State Park. Fifty plots of 100 m² were established and three surveys were conducted. All the individuals were measured, mapped and divided into categories as seedlings, juven
Braz. arch. biol. technol.. Publicado em: 2013-02
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9. CONES DE ASSIMETRIA E CURTOSE NO MERCADO BRASILEIRO DE OPÇÕES DE COMPRA DE AÇÕES: UMA ANÁLISE DOS CONES DE VOLATILIDADE PERANTE A VOLATILIDADE IMPLÍCITA CALCULADA PELOS MODELOS DE CORRADO-SU E BLACK-SCHOLES / SKEWNESS AND KURTOSIS CONES ON BRAZILIAN STOCK CALL OPTIONS MARKET: AN ANALYSIS OF VOLATILITY CONES BEYOND IMPLIED VOLATILITY CALCULATED BY CORRADO-SU AND BLACK-SCHOLES MODELS
O presente estudo tem como objetivo mostrar a existência de cones de assimetria e curtose no mercado brasileiro de opções. Além disso, os coeficientes de assimetria e curtose são de suma importância para a aplicação do modelo de Corrado e Su (1996). As volatilidades implícitas calculadas pelo método inverso deste modelo serão sobrepostas aos cones
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 14/03/2012
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10. Statistical analysis of acoustic emission signals generated during turning of a metal matrix composite
Acoustic emission technique (AET) has been used to monitor the progress of tool wear during turning of silicon carbide (20 wt.%) dispersed Al alloy metal matrix composite. Acoustic emission (AE) signals generated beyond a specific cutting distance increase abruptly. Statistical analysis based on assumed β distribution of AE energy showed that skewness and k
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2012-06
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11. Análise da estacionariedade e gaussianidade da atividade elétrica neural, do ruído biológico e do ruído de instrumentação
This work analyzes signals of spontaneous neuronal electrical activity, measured by devices known as Multi-Electrode Arrays (MEA), which are the substrate of neuronal cultures of rat hippocampus. The database under investigation consists of five signals: (i) instrumentation noise, (ii) biological noise, (iii) inactive culture and (iv) two active culture expe
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 11/07/2011
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12. Influência do estado de conservação de fragmentos florestais na estrutura de populações de espécies arbóreas de diferentes estratos verticais
A estrutura de populações representa uma síntese da história de vida dos indivíduos de populações arbóreas, e influencia na capacidade competitiva, de sobrevivência, de colonização e reprodutiva. Foram determinadas as relações alométricas de altura e diâmetro e as estruturas de tamanho e espacial de populações arbóreas de espécies de subos
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 10/06/2011