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Double sigmoidal models describing the growth of coffee berries Ciência Rural
Fernandes,Tales Jesus; Pereira,Adriele Aparecida; Muniz,Joel Augusto.
ABSTRACT: This study aimed to verify if the growth pattern of coffee berries, considering fresh mass accumulation over time, is double sigmoid and to select the most suitable nonlinear model to describe such behavior. Data used consisted of fourteen longitudinal observations of average fresh mass of coffee berries obtained in an experiment with the cultivar Obatã IAC 1669-20. The fits provided by the Logistic and Gompertz models were compared in their single and double versions. Parameters were estimated using the least squares method using the Gauss-Newton algorithm implemented in the nls function of the R software. It can be concluded that the growth pattern of the coffee fruit, in fresh mass accumulation, is double sigmoid. The double Gompertz and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Coffea arabica; Double Gompertz; Double Logistic; Nonlinear.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782017000800401
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Has Country of Origin Labeling Influenced Salmon Consumption? AgEcon
Wozniak, Shawn J..
Country-of-Origin Labeling (COOL) legislation for fish and shellfish was passed as part of the Farm Security and Rural Investment Act of 2002. Farm-raised and wild-caught seafood items caught after December 4, 2004, began COOL in April 4, 2005. COOL requires retailers to display the country of origin on seafood. Using a nonlinear AIDS model the demand for 3 salmon products was estimate--precooked, uncooked fresh, and uncooked frozen. COOL had no significant impact on consumer demand for the three products. The 3 salmon products were all found to be inelastic, but uncooked fresh was found to be more price sensitive than precooked and uncooked frozen salmon.
Tipo: Conference Paper or Presentation Palavras-chave: Salmon; COOL; Country of origin; AIDS; Nonlinear; Agricultural and Food Policy; Demand and Price Analysis; Food Consumption/Nutrition/Food Safety; International Relations/Trade.
Ano: 2010 URL: http://purl.umn.edu/56460
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