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A Choice Model with Systematic Structures in Decision Weights AgEcon
Hu, Wuyang.
This article introduces a discrete choice model which incorporates a nonlinear structural adjustment to the standard utility coefficients or decision weights. The proposed model is theoretically and empirically appealing when compared to several alternative approaches, and it can be estimated by conventional maximum likelihood. Application of the proposed model in a case study shows that it outperforms two competing approaches in model fit. Given its simplicity, this model is also capable of revealing consumers' heterogeneous choices. It is shown that based on consumers' different characteristics, their product choice and its welfare implications are also potentially different.
Tipo: Journal Article Palavras-chave: Logit models; Stated choice; Structural adjustment; Weights; Demand and Price Analysis.
Ano: 2007 URL: http://purl.umn.edu/7076
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A survey on survey statistics: What is done and can be done in Stata AgEcon
Kreuter, Frauke; Valliant, Richard.
This article will survey issues in analyzing complex survey data and describe some of the capabilities of Stata for such analyses. We will briefly review key elements of survey design and explain the effects of different design features on bias and variance. We compare different methods of variance estimation for stratified and clustered samples and discuss the handling of survey weights. We will also give examples for the practical importance of Stata’s survey capabilities.
Tipo: Article Palavras-chave: Cluster sampling; Complex design; Nonresponse; Stratified sampling; Variance estimation; Weights; DEFECT; NHANES; NHIS; PISA; Research Methods/ Statistical Methods.
Ano: 2007 URL: http://purl.umn.edu/119252
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Pre- and post-calving forage systems and reproductive performance of primiparous cows R. Bras. Zootec.
Lobato,José Fernando Piva; Menegaz,André Luís; Pereira,Antonio Carlos Gonçalves.
During pre and post calving periods, it was evaluated the influence of the following forage systems on reproductive performance of primiparous cows: natural pasture during pre and post-calving periods; natural pastures during pre-calving period and improved pastures during post-calving period; improved pastures during pre-calving and natural pasture during post-calving; improved pasture during pre- and post-calving periods. The lowest body weights and body condition scores were observed on cows kept on natural pastures pre-calving (384.3 kg and 3.31; 391.4 kg and 3.60), followed by those on improved pastures during pre-calving and on natural pasture during post-calving period (424.4 kg and 3.60), finally, cows on improved pasture during pre- and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Body condition; Brangus; Improved pastures; Natural pastures; Pregnancy rate; Weights.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982010000900029
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