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	Provedor de dados AgEcon (2) Zoologia (1) Scientia Agricola (1) Autor Cavalcanti,Mauro José (1) Demétrio,Clarice Garcia Borges (1) Fenty, Justin (1) Fernandes,Odair Aparecido (1) Kaiser, Johannes (1) Lacy, Michael G. (1) Lopes,Paulo Roberto Duarte (1) Manly,Bryan F. (1) Ribeiro Jr,Paulo Justiniano (1) Viola,Denise Nunes (1) Mais... Palavra-chave Randomization tests (4) Research Methods/ Statistical Methods (2) Analysis of distance (1) Contrasts (1) Cvtest (1) Eigenvectors (1) Euclidean distance (1) Fptest (1) Geographic variation (1) Geostatistics (1) Gower's general coefficient of similarity (1) Idempotent matrices (1) MANOVA (1) Monte Carlo (1) Multidimensional scaling (1) Multivariate data (1) Multivariate morphometrics (1) Mwtest (1) Ogcocephalidae (1) Ogcocephalus (1) Mais... Tipo do documento Info:eu-repo/semantics/article (2) Article (1) Journal Article (1) Ano 2009 (2) 2004 (1) 1998 (1) País Brazil (2) United States (2) Idioma Inglês (3) Português (1)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 4 Primeira ... 1 ... Última A general-purpose method for two-group randomization tests AgEcon Kaiser, Johannes; Lacy, Michael G.. We outline a novel approach to calculate exact p-levels for two-sample randomization tests. The approach closely resembles permute in its applications, with the main difference being that the results are approximated only if the execution time needed to calculate exact p-levels would exceed a specified maximum. We demonstrate its use by deriving p-levels for the significance of Somers’ D, the coefficient of variation, the difference in means and in medians, and the difference in two multinomials. Tipo: Article Palavras-chave: Tsrtest; Mwtest; Fptest; Somersdtest; Cvtest; Vartest; Randomization tests; Monte Carlo; Two-sample problem; Research Methods/ Statistical Methods. Ano: 2009 URL: http://purl.umn.edu/122702 Analyzing distances AgEcon Fenty, Justin. Gower and Krzanowski (1999) described the analysis of a multivariate dataset that violated the assumptions of normality for multivariate analysis of variance. They developed a method comprising two aspects: a graphical representation of the points in a fewer number of dimensions, known as principal coordinate analysis; and a technique similar to MANOVA except that it was based on partitioning the distances between subjects, rather than sums of squares, and did not assume that the data followed any particular distribution. This article summarizes both aspects of their analysis and describes the Stata pco and aod commands, which perform principal coordinate analysis and analysis of distance. Tipo: Journal Article Palavras-chave: Multivariate data; Principal coordinate analysis; Multidimensional scaling; Euclidean distance; Gower's general coefficient of similarity; Eigenvectors; Analysis of distance; MANOVA; Partitioning of squared distance; Randomization tests; Contrasts; Idempotent matrices; Research Methods/ Statistical Methods. Ano: 2004 URL: http://purl.umn.edu/116209 Spatial pattern detection modeling of thrips (Thrips tabaci) on onion fields Scientia Agricola Ribeiro Jr,Paulo Justiniano; Viola,Denise Nunes; Demétrio,Clarice Garcia Borges; Manly,Bryan F.; Fernandes,Odair Aparecido. Onion (Allium cepa) is one of the most cultivated and consumed vegetables in Brazil and its importance is due to the large laborforce involved. One of the main pests that affect this crop is the Onion Thrips (Thrips tabaci), but the spatial distribution of this insect, although important, has not been considered in crop management recommendations, experimental planning or sampling procedures. Our purpose here is to consider statistical tools to detect and model spatial patterns of the occurrence of the onion thrips. In order to characterize the spatial distribution pattern of the Onion Thrips a survey was carried out to record the number of insects in each development phase on onion plant leaves, on different dates and sample locations, in four rural... Tipo: Info:eu-repo/semantics/article Palavras-chave: Poisson distribution; Spatial statistics; Randomization tests; Geostatistics. Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000100013 Variação geográfica de caracteres quantitativos em Ogcocephalus vespertilio (Linnaeus) (Teleostei, Lophiiformes, Ogcocephalidae) Zoologia Cavalcanti,Mauro José; Lopes,Paulo Roberto Duarte. Patterns of geographic variation in 10 morphometric characters were analyzed in a sample of 91 specimens of the batfish, Ogcocephalus vespertilio (L.), from the NE and SE Brazilian coast, using multivariate statistics and randomization tests. The specimens were ordinated by principal components analysis in two groups corresponding to the regions north and south of the 23ºC isotherm, and size variation was found to account for 70.3%, whereas shape differences accounted for 23.6% of the total variation in morphometric characters. The two groups were different at the 1% significance level by multivariate analysis of variance based on the Wilk's criterion, tested by a randomization procedure. Width of illicial cavity and distance from anus to anal fin were the... Tipo: Info:eu-repo/semantics/article Palavras-chave: Ogcocephalidae; Ogcocephalus; Geographic variation; Multivariate morphometrics; Randomization tests. Ano: 1998 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81751998000100010 Registros recuperados: 4 Primeira ... 1 ... Última

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