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	Provedor de dados ArchiMer (3) Autor Laurec, Alain (1) Marin, Jean (1) Pelletier, Dominique (1) Palavra-chave Rendement par recrue (3) Sensibilité (3) Analyse des cohortes (2) Sensitivity (2) Yield per recruit (2) Analyse de population virtuelle (1) Croissance (1) Delta method (1) Delta-method (1) Estimation de la variance (1) Fecundity (1) Fishery biology (1) Fécondité par recrue (1) Growth (1) Langouste (1) Length cohort analysis (1) Maturité sexuelle (1) Méthode Delta (1) Méthode delta (1) Palinurus elephas (1) Mais... Tipo do documento Text (3) Ano 1990 (1) 1987 (2) País France (3) Idioma Francês (2) Inglês (1)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 3 Primeira ... 1 ... Última Sensitivity and variance estimators for virtual population analysis and the equilibrium yield per recruit model ArchiMer Pelletier, Dominique. Fish stock assessment makes Widespread use of Virtual Population Analysis (VPA) and long-term equilibrium prediction models. Although there have been some statistical investigations about the properties of VPA results, apparently there are no complete analyse about predictions statistical and numerical behaviour. However, management decisions generally rely upon production forecasts. This paper compares stability properties of VPA and the yield per recruit model with regard to various errors concerning all the input parameters. Robustness fis assessed by means of first-ordo sensitivities whereas variances are inferred from delta-method estimators. Sensitivity of yield per recruit appears to be mainly due to terminal mortality rate and age-specific weights,... Tipo: Text Palavras-chave: Analyse de population virtuelle; Rendement par recrue; Sensibilité; Estimation de la variance; Méthode Delta; Virtual Population Analysis; Yield per recruit; Sensitivity; Variance estimation; Delta-method. Ano: 1990 URL: http://archimer.ifremer.fr/doc/00189/30068/28556.pdf Les méthodes delta en halieutique. Evaluation des sensibilites, approximation des biais et variances à l'aide de developpements limites ArchiMer Laurec, Alain. This report presents an introduction to so called "delta methods", associated to the use of Taylor's expansions, as a tool for sensitivity analyses. It starts with a mathematical and statistical summary about Taylor's expansion and moments of random variâtes. Special attention is paid to multivariate problems. The application of order 1 and 2 expansions to estimate variances and biases is exposed in great details. This report dedicated to fisheries scientists, is finally illustraded by an example associated to yield per recruit calculations, based upon JONE'S length cohort analysis. Tipo: Text Palavras-chave: Analyse des cohortes; Rendement par recrue; Méthode delta; Sensibilité; Length cohort analysis; Yield per recruit; Delta method; Sensitivity. Ano: 1987 URL: https://archimer.ifremer.fr/doc/1987/rapport-1565.pdf Exploitation, biologie et dynamique du stock de langouste rouge de Corse, Palinurus elephas Fabricius ArchiMer Marin, Jean. The European red spiny lobster (Palinurus elephas) is the main target species of the small-scale fishery in Corsica. This fishery was described, its trends from 1981 to 1964 were analysed, and the exploitation conditions of the spiny lobster stock (fishing grounds, strategy and gear ; fishing regulations) were explained. Furthermore, the fishing effort and the yields were estimated through an indirect survey, in 1983 and 1984 . The growth was studied through tagging experiments. Growth increment per moult, Von BERTALANFFY's equation parameters, and moulting frequency were estimated for both sexes. Bias risks associated to tag loss at moulting were also analysed. In addition, estimates of K and L∞ variances were provided through "Jack-knife"... Tipo: Text Palavras-chave: Palinurus elephas; Fishery biology; Population dynamics; Fecundity; Recruitment; Sexual maturity; Growth; Stock assessment; Sensibilité; Fécondité par recrue; Rendement par recrue; Analyse des cohortes; Maturité sexuelle; Croissance; Pêcherie; Langouste. Ano: 1987 URL: http://archimer.ifremer.fr/doc/1987/these-1036.pdf Registros recuperados: 3 Primeira ... 1 ... Última

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