|
|
|
| Registros recuperados: 81 | |
|
|
| Gallet, Craig A.. |
| Numerous studies have estimated elasticities of alcohol demand using different procedures. Because of widespread differences in demand estimates, however, it is difficult to synthesise the literature into coherent meaning. This study improves our understanding of alcohol demand by reporting results from a meta-analysis of 132 studies. Specifically, regressing estimated price, income and advertising elasticities of alcohol on variables accounting for study characteristics, we find alcohol elasticities to be particularly sensitive to demand specification, data issues and various estimation methods. Furthermore, compared to other alcoholic beverages, beer elasticities tend to be more inelastic. |
| Tipo: Journal Article |
Palavras-chave: Alcohol demand; Elasticity; Meta-analysis; Demand and Price Analysis. |
| Ano: 2007 |
URL: http://purl.umn.edu/118323 |
| |
|
| |
|
|
| Stern, David I.. |
| Interfuel substitutability has been of longstanding interest to energy economists and policy makers. However, there has been no quantitative meta-analysis of this literature. This research report fills this gap by analysing a broad sample of studies of interfuel substitution in the industrial sector, manufacturing industry or sub-industries, and macro-economy of a variety of developed and developing economies. The primary study sample size has been included in the meta-regression to control for publication bias. At the industrial level, results for the shadow elasticities of substitution between coal, oil, gas, and electricity for forty-six primary studies show that, except for gas-electricity and coal-electricity, there are easy substitution... |
| Tipo: Report |
Palavras-chave: Meta-analysis; Energy; Substitution; Elasticity; Interfuel; Environmental Economics and Policy; Resource /Energy Economics and Policy; D24; Q40. |
| Ano: 2009 |
URL: http://purl.umn.edu/94882 |
| |
|
| |
|
| |
|
| |
|
| |
|
|
| Hess, Sebastian; von Cramon-Taubadel, Stephan. |
| Quantification of welfare changes due to trade liberalisation play a crucial role for political decision making. However, meaningful comparisons of simulation results from different sources are difficult. Often significant differences in simulated gains from liberalisation do not serve to increase confidence in quantitative assessments based on trade models. We employ a metaanalysis of applied trade simulations under the WTO Doha Round to identify model characteristics that influence the magnitude of simulation results, and to estimate the magnitude of this influence. Findings from our simple econometric model are plausible and show that each simulation experiment represents a complex interaction of experimental settings that may not easily be understood... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Meta-analysis; CGE; Partial Equilibrium; Trade Liberalization; C00; C23; C68; F10; International Relations/Trade. |
| Ano: 2006 |
URL: http://purl.umn.edu/25512 |
| |
|
| |
|
|
| Gunaratna, Nilupa S.; De Groote, Hugo; McCabe, G.P.. |
| Biofortification, or the genetic improvement of the nutritional quality of food crops, is a promising strategy to combat undernutrition, particularly among the rural poor in developing countries. However, traditional methods of impact assessment do not apply to biofortified crops as little or no yield increases are expected. Significant progress has been made to develop maize varieties with improved protein quality, collectively known as quality protein maize (QPM). Evidence for the impact of QPM at the community level, as demonstrated by randomized, controlled studies, was evaluated using meta-analysis. A new and generalizable effect size was proposed to quantify the impact of QPM on a key outcome, child growth. The results indicated that consumption of... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Impact assessment; Biofortification; Meta-analysis; Crop Production/Industries; Food Security and Poverty. |
| Ano: 2008 |
URL: http://purl.umn.edu/44166 |
| |
|
| |
|
|
| Harris, Ross J.; Bradburn, Michael J.; Deeks, Jonathan J.; Harbord, Roger M.; Altman, Douglas G.; Sterne, Jonathan A.C.. |
| This article describes updates of the meta-analysis command metan and options that have been added since the command’s original publication (Bradburn, Deeks, and Altman, metan — an alternative meta-analysis command, Stata Technical Bulletin Reprints, vol. 8, pp. 86–100). These include version 9 graphics with flexible display options, the ability to meta-analyze precalculated effect estimates, and the ability to analyze subgroups by using the by() option. Changes to the output, saved variables, and saved results are also described. |
| Tipo: Article |
Palavras-chave: Metan; Meta-analysis; Forest plot; Research Methods/ Statistical Methods. |
| Ano: 2008 |
URL: http://purl.umn.edu/120926 |
| |
|
| |
|
|
| White, Ian R.; Higgins, Julian P.T.. |
| A new command, metamiss, performs meta-analysis with binary outcomes when some or all studies have missing data. Missing values can be imputed as successes, as failures, according to observed event rates, or by a combination of these according to reported reasons for the data being missing. Alternatively, the user can specify the value of, or a prior distribution for, the informative missingness odds ratio. |
| Tipo: Article |
Palavras-chave: Metamiss; Meta-analysis; Missing data; Informative missingness odds ratio; Research Methods/ Statistical Methods. |
| Ano: 2009 |
URL: http://purl.umn.edu/122700 |
| |
|
|
| Drakeford, Ben; Pascoe, Sean. |
| Intensive aquaculture, especially the production of carnivorous species, requires artificial feeding. Fishmeal and oil are preferred to vegetable proteins, since marine proteins provide the essential nutrients required by farmed fish. Therefore, given the stagnant production of reduction species and the rapid increase in aquaculture production, fishmeal availability would pose a biological constraint on aquaculture contribution to world fish supplies in the future, unless alternative feed sources can be incorporated in diets. In this paper, the technical substitutability between fish and vegetable based feeds are assessed through the estimation of Morishima elasticities of substitution. These are derived from a meta-analysis production function. |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Fishmeal; Meta-analysis; Salmon; Trout; Elasticity; Livestock Production/Industries; Q2. |
| Ano: 2005 |
URL: http://purl.umn.edu/56074 |
| |
|
|
| Espey, James A.; Espey, Molly. |
| Meta-analysis us used to quantitatively summarize previous studies of residential electricity demand to determine if there are factors that systematically affect estimated elasticities. In this study, price and income elasticities of residential demand for electricity from previous studies are used as the dependent variables, with data characteristics, model structure, and estimation technique as independent variables, using both least square estimation of a semilog and maximum likelihood estimation of a gamma model. The findings of this research can help better inform public policy makers, regulators, and utilities about the responsiveness of residential electricity consumers to price and income changes. |
| Tipo: Journal Article |
Palavras-chave: Electricity demand; Income elasticity; Meta-analysis; Price elasticity; Residential electricity demand; Q40; Q41; D12. |
| Ano: 2004 |
URL: http://purl.umn.edu/42897 |
| |
|
|
| Sterne, Jonathan A.C.; Harbord, Roger M.. |
| Funnel plots are a visual tool for investigating publication and other bias in meta-analysis. They are simple scatterplots of the treatment effects estimated from individual studies (horizontal axis) against a measure of study size (vertical axis). The name “funnel plot” is based on the precision in the estimation of the underlying treatment effect increasing as the sample size of component studies increases. Therefore, in the absence of bias, results from small studies will scatter widely at the bottom of the graph, with the spread narrowing among larger studies. Publication bias (the association of publication probability with the statistical significance of study results) may lead to asymmetrical funnel plots. It is, however, important to realize that... |
| Tipo: Journal Article |
Palavras-chave: Metafunnel; Funnel plots; Meta-analysis; Publication bias; Small-study effects; Research Methods/ Statistical Methods. |
| Ano: 2004 |
URL: http://purl.umn.edu/116233 |
| |
|
| |
|
|
| Almeida,TW; Silva,AL; Saccomani,AP; Muñoz,JA; Silva,RT; Franca,NV; Faria,DE; Faria Filho,DE. |
| ABSTRACT Feed formulation using linear programming consists of determining the mixture of feedstuffs required to meet pre-established animal nutritional requirements at the lowest cost. On the other hand, with the use of non-linear programming, it is possible to define nutritional requirements at the time of formulation, aiming at maximum profit. The objective of the present study was to compare feeds formulated using linear and non-linear programming in terms of live performance and internal and external egg quality of commercial laying hens. A total of 288 Hisex® White laying hens, 1.540 ± 0.128 g body weight, were evaluated from 33 to 45 weeks of age. Hens were distributed in a completely randomized block design, including six treatments with six... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Diminishing returns; Linear programming; Mathematical modeling; Meta-analysis; Profit.. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2019000300313 |
| |
| Registros recuperados: 81 | |
|
|
|
