|
|
|
| Registros recuperados: 26.534 | |
|
|
| Fuglie, Keith O.. |
| Rapid increases in agricultural commodity prices during 2006-08 raised concerns that agricultural productivity growth may not be keeping up with increasing demand for agricultural commodities. ERS has developed a new index of total factor productivity (TFP) in global agriculture to provide a more comprehensive understanding of longrun sources of agricultural output growth. ERS research shows that the average rate of growth in global agricultural TFP has accelerated in recent decades and accounts for an increasing share of growth in agricultural production. Faster TFP growth has offset declining growth in agricultural land, labor, and other resources, although TFP growth across countries and global regions remains unevenly distributed. |
| Tipo: Article |
Palavras-chave: Productivity Analysis. |
| Ano: 2010 |
URL: http://purl.umn.edu/121897 |
| |
|
| |
|
|
| Berning, Joshua P.. |
| Recent studies examine the impact of the built environment on health outcomes such as obesity. Several studies find for certain populations that access to unhealthy food has a positive effect on obesity, whereas access to healthy choices has a negative effect. Given the growth and popularity of locally grown food, we examine how individual weight outcomes are affected by access to direct-to-consumer local food. After controlling for potential endogeneity, we find that greater access to local food has a negative association with individual weight outcomes. We also find a negative association with greater weight loss over a one-year period. These results provide evidence that local food access can have potential indirect benefits. |
| Tipo: Article |
Palavras-chave: Local agriculture; Obesity; Food access; Food Consumption/Nutrition/Food Safety; Health Economics and Policy. |
| Ano: 2012 |
URL: http://purl.umn.edu/123313 |
| |
|
|
| Nottenburg, Carol; Pardey, Philip G.; Wright, Brian D.. |
| As patents and other forms of intellectual property become more pervasive in the next generation of biotechnologies, designing policies and practices to ensure sufficient freedom to operate (i.e., the ability to practice or use an innovation) will be crucial for non-profit research agencies, especially those intent on developing technologies destined for commercial release. Are non-profit organisations exempt from intellectual property claims? What constitutes infringement of a patent? How does a non-profit establish its freedom to operate? We address these issues in this paper and evaluate various options for accessing other people’s technologies. Options include crosslicensing agreements, research-only or cost-free licences, market segmentation... |
| Tipo: Article |
Palavras-chave: Research and Development/Tech Change/Emerging Technologies. |
| Ano: 2002 |
URL: http://purl.umn.edu/118622 |
| |
|
|
| Janes, Holly; Longton, Gary M.; Pepe, Margaret S.. |
| Classification accuracy is the ability of a marker or diagnostic test to discriminate between two groups of individuals, cases and controls, and is commonly summarized by using the receiver operating characteristic (ROC) curve. In studies of classification accuracy, there are often covariates that should be incorporated into the ROC analysis. We describe three ways of using covariate information. For factors that affect marker observations among controls, we present a method for covariate adjustment. For factors that affect discrimination (i.e., the ROC curve), we describe methods for modeling the ROC curve as a function of covariates. Finally, for factors that contribute to discrimination, we propose combining the marker and covariate information, and we... |
| Tipo: Article |
Palavras-chave: Roccurve; Comproc; Rocreg; Receiver operating characteristic analysis; ROC; Covariates; Sensitivity; Specificity; Research Methods/ Statistical Methods. |
| Ano: 2009 |
URL: http://purl.umn.edu/122695 |
| |
|
| |
|
| |
| Registros recuperados: 26.534 | |
|
|
|
