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	Provedor de dados AgEcon (1) Bragantia (1) Autor Arriaza Balmón, Manuel (1) Blain,Gabriel Constantino (1) Gomez-Limon, Jose Antonio (1) Meschiatti,Monica Cristina (1) Pereira,Heloisa Ramos (1) Pires,Regina Célia de Matos (1) Mais... Palavra-chave Model performance (2) Decision-making (1) Mathematical programming (1) Modelling (1) Modified index of agreement (1) Refined index of agreement (1) Resource /Energy Economics and Policy (1) Mais... Tipo do documento Conference Paper or Presentation (1) Info:eu-repo/semantics/article (1) Ano 2018 (1) 2002 (1) País Brazil (1) United States (1) Idioma Inglês (2)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 2 Primeira ... 1 ... Última Comparative Performance of Selected Mathematical Programming Models AgEcon Arriaza Balmón, Manuel; Gomez-Limon, Jose Antonio. This study compares the predictive performance of several mathematical programming models. Using the cropping patterns, yields and crop gross margins of eighteen farms over a period of five years we compare the models' optimum solutions with observed crop distributions after the Reform of the EU Common Agricultural Policy of 1992. The results show that the best prediction corresponds to a model that includes expected profit and a qualitative measure of crop riskiness. The results suggest that, in order to obtain reliable predictions, the modelling of farmers' responses to policy changes must consider the risk associated with any given cropping pattern. Finally, we test the ability of the proposed model to reproduce the farmers' observed behaviour with... Tipo: Conference Paper or Presentation Palavras-chave: Model performance; Mathematical programming; Modelling; Decision-making; Resource /Energy Economics and Policy. Ano: 2002 URL: http://purl.umn.edu/24792 On the performance of three indices of agreement: an easy-to-use r-code for calculating the Willmott indices Bragantia Pereira,Heloisa Ramos; Meschiatti,Monica Cristina; Pires,Regina Célia de Matos; Blain,Gabriel Constantino. ABSTRACT A key step for any modeling study is to compare model-produced estimates with observed/reliable data. The original index of agreement (also known as original Willmott index) has been widely used to measure how well model-produced estimates simulate observed data. However, in its original version such index may lead the user to erroneously select a predicting model. Therefore, this study compared the sensibility of the original index of agreement with its two newer versions (modified and refined) and provided an easy-to-use R-code capable of calculating these three indices. First, the sensibility of the indices was evaluated through Monte Carlo Experiments. These controlled simulations considered different sorts of errors (systematic, random and... Tipo: Info:eu-repo/semantics/article Palavras-chave: Modified index of agreement; Refined index of agreement; Model performance. Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052018000200394 Registros recuperados: 2 Primeira ... 1 ... Última

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