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A meta-analysis of the response of calorie demand to income changes AgEcon
Ogundari, Kolawole; Abdulai, Awudu.
Over the past three decades, several studies have analyzed the response of calorie intake to income with varying and inconclusive results. This paper review these studies and employs meta-analysis to examine the potential bias in the calorie-income elasticity, as well as the impact of specific study attributes on these elasticities reported in the empirical literature. A total of 40 studies which yielded 99 estimated elasticities were considered. The results show the presence of publication (reporting) selection bias in the reported elasticities. Besides, the estimates revealed evidence of positive and significant empirical effect of income on calorie intake from all the studies that goes beyond publication bias. Study attributes such as ranking of the...
Tipo: Presentation Palavras-chave: Calorie-income elasticity; Heterogeneity; Meta-analysis; Agricultural and Food Policy; Consumer/Household Economics; Demand and Price Analysis; Food Consumption/Nutrition/Food Safety; D12; C01.
Ano: 2012 URL: http://purl.umn.edu/123287
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A statistical approach for assessing the heterogeneity of Hass avocados subjected to different postharvest abiotic stresses Ciencia e Investigación Agraria
Fuentealba,Claudia; Pedreschi,Romina; Hernández,Ignacia; Saavedra,Jorge.
C. Fuentealba, R. Pedreschi, I. Hernández, and J. Saavedra. 2016. A statistical approach for assessing the heterogeneity of Hass avocados subjected to different postharvest abiotic stresses. Cien. Inv. Agr. 43(3):356-365. Hass avocado (Persea americana Mill.) is marketed worldwide. Due to its complex physiology, a wide variability in postharvest ripening can be observed, i.e., heterogeneity in the number of days to reach edible ripeness. There is a need for a simple and objective method for evaluating the efficacy of postharvest treatments in the reduction of this postharvest ripening heterogeneity given the high demand of import countries for consistent quality and product homogeneity. Therefore, the aim of this study was to compare the appropriateness of...
Tipo: Journal article Palavras-chave: Avocados; Heterogeneity; Multiple comparison; Ripening; Standard deviation.
Ano: 2016 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202016000300002
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Abatement Cost Heterogeneity and its Impact on Tradable Nitrogen Discharge Permits AgEcon
Ramilan, Thiagarajah; Scrimgeour, Frank G..
Nitrogen discharge into the Waikato River has been identified as the primary source of potential water quality degradation. Rising nitrogen levels in water are attributed to non point source pollution from agricultural activities. Pastoral farming is the predominant agricultural land use in the catchment. Increased nitrogen fertilizer use and higher stocking rates have the potential to increase the nitrogen loading into water. There is a range of best management practices and policies proposed to reduce nitrogen discharge from farming systems. Water quality trading is a policy tool that could improve the cost effectiveness of achieving environmental goals. Economic theory suggests that tradable pollution permit systems encourage polluters to reallocate...
Tipo: Conference Paper or Presentation Palavras-chave: Heterogeneity; Tradable discharge permits; Non-point pollution; Marginal abatement cost; Environmental Economics and Policy.
Ano: 2006 URL: http://purl.umn.edu/31972
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Abiotic gradients drive floristic composition and structure of plant communities in the Monte Desert RChHN
ACEBES,PABLO; TRABA,JUAN; PECO,BEGOÑA; REUS,MARÍA L; GIANNONI,STELLA M; MALO,JUAN E.
Defining plant communities in desert zones is difficult due to large scale homogeneity and small scale heterogeneity, thus making provision of systematic information for conservation decisions problematic. We analysed plant communities of the most arid sector of Monte Desert for structure, plant composition and environmental variables. Small-scale variables such as slope, rock cover, bare ground and litter, as well as large-scale ones such as species diversity, composition and similarity within and between sites were included. Analyses of floristic composition showed the difficulty of segregating distinct communities due to high internal heterogeneity and overlap between the different sites. Only mesquite woodlands, a community situated at the extreme of...
Tipo: Journal article Palavras-chave: Arid environment; Heterogeneity; Shrubland; Similarity; Species richness.
Ano: 2010 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2010000300007
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Accounting for Heterogeneity in Hedging Behavior: Comparing & Evaluating Grouping Methods AgEcon
Pennings, Joost M.E.; Garcia, Philip; Irwin, Scott H..
Heterogeneity, i.e., the notion that individuals respond differently to economic stimuli, can have profound consequences for the interpretation of behavior and the formulation of agricultural policy. This paper compares and evaluates three grouping techniques that can be used to account for heterogeneity in financial behavior. Two are well established: company-type grouping and cluster analysis. A third, the generalized mixture regression model, has recently been developed and is worth considering as market participants are grouped such that their response to the determinants of economic behavior is similar. We evaluate the grouping methods in a hedging framework by assessing their ability to reflect relationships consistent with theory. The empirical...
Tipo: Conference Paper or Presentation Palavras-chave: Economic behavior; Heterogeneity; Hedging; Methods; Risk and Uncertainty; A10; B40; C1; D0; G0; L2; Q13.
Ano: 2011 URL: http://purl.umn.edu/114787
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Análisis econométrico de la heterogeneidad de las preferencias de los individuos: aplicación a la valoración económica de la conservación del paisaje agrícola de montaña AgEcon
Colombo, Sergio; Hanley, Nick.
The need to account for respondents’ preference heterogeneity in stated choice models has motivated researchers to apply random parameter logit and latent class models. In this paper we compare these three alternative ways of incorporating preference heterogeneity in stated choice models and evaluate how the choice of model affects welfare estimates in a given empirical application. Finally, we discuss what criteria to follow to decide which approach is most appropriate. RESUMEN: La necesidad de incorporar la heterogeneidad en las preferencias de los individuos en los modelos de elección discreta ha llevado a los investigadores a emplear siempre más frecuentemente modelos de parámetros aleatorios o de clases latentes. En este artículo se comparan tres...
Tipo: Journal Article Palavras-chave: Heterogeneity; Heterogeneidad; Modelos de clases latentes; Modelos de heterogeneidad de la varianza; Modelos de parámetros aleatorios; Paisaje de montaña; Latent class models; Covariance heterogeneity models; Random parameter models; Uphill landscape; Environmental Economics and Policy; Research Methods/ Statistical Methods; C52; Q24.
Ano: 2008 URL: http://purl.umn.edu/37191
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Collective Voluntary Approaches to Food Safety with Heterogeneous Firms: Monitoring and Design? AgEcon
Bignebat, Celine; Rouviere, Elodie.
Collective quality management systems are well known instruments to manage the quality and/or the safety of foodstuffs. They can be considered as voluntary approaches to food safety. In environmental economics some empirical studies emphasize that firms entering into a collective voluntary program behave differently because their motivations differ. To the best of our knowledge, there is no formal discussion on the effectiveness of a collective voluntary program in which firms adopt different behaviour once they entered the program. Starting from this two strand of literature, we extend the analytical framework of collective voluntary approaches considering heterogeneous firms and applying it to food safety issues. We show that according to firm’s...
Tipo: Conference Paper or Presentation Palavras-chave: Voluntary Approaches; Food Safety; Collective Action; Heterogeneity; Food Consumption/Nutrition/Food Safety; Q18; L51; L81.
Ano: 2007 URL: http://purl.umn.edu/9441
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Consumer Heterogeneity: Does It Affect Policy Responses to the Obesity Epidemic? AgEcon
Lyford, Conrad P.; Belasco, Eric J.; Chidmi, Benaissa; Funtanilla, Margil.
The fight against obesity in the U.S. has become a priority area for policy makers due to the additional health risks and health care costs. In developing policy to lower obesity rates, it is important to accurately characterize the impact that exercise, smoking and demographic characteristics have on BMI in order to draft effective policy. This analysis uses data from the Behavioral Risk Factor Surveillance System (BRFS) to evaluate the relationship between behavioral and demographic factors with BMI while explicitly accounting for individual heterogeneity by using a quantile analysis. Results suggest that the effect of exercise, smoking, occupation and race vary by BMI quantile, indicating that consumers should be treated as heterogeneous at least for...
Tipo: Conference Paper or Presentation Palavras-chave: Obesity; Quantile Regression; Heterogeneity; Policy; Food Consumption/Nutrition/Food Safety; I18.
Ano: 2010 URL: http://purl.umn.edu/56467
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Cr/Al Oxide as Solid Acid Catalyst to Afford Babassu Biodisel. Repositório Alice
MOURA, C. V. R.; NERES, H. L. S.; LIMA, M. G.; MOURA, E. M.; MOITA NETO, J. M.; OLIVEIRA, J. E. de; LIMA, J. R. O.; SITTOLIN, I. M.; ARAUJO, E. C. E..
In this work, it was described the preparation and the characterization of a solid acid catalyst obtained by the mixture of Cr/Al oxides (CRAL). The catalyst was tested in the transesterification reaction of babassu oil with 5% of free fatty acid (FFA). The results of textural and acidity characteristics of CRAL were: area (56 m2 g-1), pore size (7.0 μm), total acidity (182.28 μmol g-1), wherein Brönsted sites are the most active. Powder X-ray diffractometry (XRD), scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDX) show three phases of the catalyst (Cr2O3/Na2Cr2O3/Al2O3), 0.25:0.25:0.50, respectively. The reaction reached conversion about 98.6% under the conditions: alcohol/oil molar ratio (24:1), catalyst...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Óleo de babaçu; Cinética; Reutilização; Heterogeneidade; Biocombustível; Catalisador; Lixiviação; Biodiesel; Catalyst; Babassu oil; Kinetic; Reusability; Leaching; Heterogeneity.
Ano: 2015 URL: http://www.alice.cnptia.embrapa.br/handle/doc/1030158
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Cytoplasmic granules in oocytes do not influence embryonic and early fetal development in bovine. Repositório Alice
ROSA, P.; RAGAGNIN, M.; GARCIA, J. M. J.; OLIVEIRA, C. S..
bitstream/item/203305/1/Cytoplasmic-granules0001.pdf
Tipo: Resumo em anais de congresso (ALICE) Palavras-chave: Heterogeneity; Analysis; Minitab.
Ano: 2019 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1113122
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Dinâmica da dormência e brotação de gemas de vimeiro no Planalto Sul Catarinense Repositório Alice
RECH, T.D.; ZANETTE, F.; BRANDES, D.; AMARANTE, C.V.T. do.
O objetivo deste trabalho foi avaliar a dinâmica e a heterogeneidade de dormência de gemas, e avaliar o efeito de diferentes épocas de colheita de ramos na brotação do vimeiro, no Planalto Sul Catarinense. Ramos de ano foram colhidos nos meses de abril a agosto de 2005, nos municípios catarinenses de Lages, Bocaina do Sul e Urupema. A dormência de gemas foi avaliada em estacas retiradas da base (0 a 12 cm), centro (12 a 24 cm) e ápice (24 a 36 cm) de ramos com comprimento superior a 150 cm. Foram utilizadas estacas com e sem redução para uma única gema. As brotações das plantas em campo também foram avaliadas. A dormência mais intensa de gemas de ramos de ano ocorreu em maio, quando a intensidade de dormência e a freqüência de gemas dormentes decresceram...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Salix x rubens; Heterogeineidade; Endodormência; Teste de estacas; Heterogeneity; Endodormancy; Cuttings test.
Ano: 2007 URL: http://www.alice.cnptia.embrapa.br/handle/doc/122803
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Diversity and spatial heterogeneity of mangrove associated sponges of Curaçao and Aruba Naturalis
Hunting, E.R.; Soest, R.W.M. van; Geest, H.G. van der; Vos, A.; Debrot, A.O..
Sponges are major epibionts of mangrove roots in the Caribbean. Mangrove sponge communities in the Caribbean mainly consist of species that are typical to this habitat and community compositions often differ from those found on coral reefs nearby. Heterogeneity in species distributions between locations and within locations between roots is often reported. This study quantifies the diversity and abundance of mangrove associated sponges in the inner bays of Curaçao and Aruba and correlates variability of regional sponge diversity with environmental variables measured along the surveyed sites. Tannin concentrations vary between mangrove roots, and were correlated to sponge cover as a possible cause for habitat heterogeneity on a smaller scale. A total of 22...
Tipo: Article / Letter to the editor Palavras-chave: Epibionts; Heterogeneity; Mangroves; Spatial variations; Sponges; Tannins; 42.72.
Ano: 2008 URL: http://www.repository.naturalis.nl/record/291892
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Does geography matter in nutrient abatement? Bioeconomic model of heteregoneus farm nutrient loads AgEcon
Helin, Janne.
Economists often rely on stylised models for analysis of environmental policies. This study demonstrates that abstracting from soil and topography can have profound effect on marginal abatement costs of nutrient loads. By extending earlier bioeconomic models to represent heterogeneous soils and slopes, it is possible to show that targeting the abatement methods on high load risk areas allows low cost reduction. Ignoring the heterogeneity can lead to significant overestimates of the abatement costs and hence to misleading policy recommendations. The results hold even for relatively Flat areas, such as the watershed of River Kalajoki, for which the model was applied to.
Tipo: Conference Paper or Presentation Palavras-chave: Non-point source water pollution; Abatement costs; Heterogeneity; Agricultural and Food Policy; Environmental Economics and Policy; Q25; Q52.
Ano: 2009 URL: http://purl.umn.edu/51693
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Effect of size grading on sea bass (Dicentrarchus labrax) juvenile self- feeding behaviour, social structure and culture performance ArchiMer
Benhaim, David; Pean, Samuel; Brisset, Blandine; Leguay, Didier; Begout, Marie-laure; Chatain, Beatrice.
This study aims to test the influence of size grading on self-feeding behaviour, social structure (measured by the percentage of triggering acts per individual), growth performances, and blood physiological variables of individually passive integrated transponder (PIT)-tagged sea bass juveniles, using a computerized on-demand feeding system coupled with a PIT tag monitoring device. Three consecutive periods of 27 days each were compared: a first period (P1) before grading (6 tanks of 100 fish; 40.2 +/- 8.9 g) followed by a second period (P2) after grading. The protocol applied aimed to create two groups of fish of similar mean weight but with either a low or a high coefficient of variation of weight (CV(w)) corresponding to an imposed difference in social...
Tipo: Text Palavras-chave: Feeding behaviour; Self feeder; Triggering activity; Heterogeneity; Growth; Grading.
Ano: 2011 URL: http://archimer.ifremer.fr/doc/00057/16858/14340.pdf
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Environmental Kuznets Curves for Carbon Emissions: A Critical Survey AgEcon
Aslanidis, Nektarios.
The empirical finding of an inverse U-shaped relationship between per capita income and pollution, the so-called Environmental Kuznets Curve (EKC), suggests that as countries experience economic growth, environmental deterioration decelerates and thus becomes less of an issue. Focusing on the prime example of carbon emissions, the present article provides a critical review of the new econometric techniques that have questioned the baseline polynomial specification in the EKC literature. We discuss issues related to the functional form, heterogeneity, “spurious” regressions and spatial dependence to address whether and to what extent the EKC can be observed. Despite these new approaches, there is still no clear-cut evidence supporting the existence of the...
Tipo: Working or Discussion Paper Palavras-chave: Environmental Kuznets Curve; Carbon Emissions; Functional Form; Heterogeneity; “Spurious” Regressions; Spatial Dependence; Environmental Economics and Policy; C20; Q32; Q50; O13.
Ano: 2009 URL: http://purl.umn.edu/54299
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Exploring Heterogeneity in Consumers’ Meat Store Choices in an Emerging Market AgEcon
Hu, Wuyang.
Chinese consumers’ choices among meat stores are examined through a model that can capture consumer heterogeneities both in their opinion of various store attributes and in how much weight they attach to each attribute. This approach not only informs store managers as to what attributes should receive focus for improving their store images, but also provides insight about which specific attribute could be improved to achieve the most effective result. Based on the individual-level parameters obtained through an empirical Bayes analysis, managers or competitors are able to strategically target their store promotions to specific individual consumers based on their demographic characteristics.
Tipo: Journal Article Palavras-chave: Heterogeneity; Individual-level parameters; Logit models; Meat store; Livestock Production/Industries; Research and Development/Tech Change/Emerging Technologies.
Ano: 2006 URL: http://purl.umn.edu/62275
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Fishing for more understanding: a mixed logit-error component model of freshwater angler site choice AgEcon
Beville, Stephen; Kerr, Geoffrey N..
Recreational anglers are known to seek different types of experiences in different settings. Such preference and behavioural diversity has important management implications. Research methods which assume only a limited degree of preference heterogeneity and impose rigid substitution patterns can impair understanding of individual’s unique decision process and lead to misguided management and policy recommendations. This paper reports results from an internet-based stated preference survey of recreational trout anglers in the North Canterbury Region of New Zealand. A mixed logit model, which simultaneously specifies random parameters plus error components, is used to capture the extent of random preference heterogeneity in systematic utility along with...
Tipo: Conference Paper or Presentation Palavras-chave: Random utility model; Latent class; Mixed logit; Error component; Heterogeneity; Recreational angler.
Ano: 2009 URL: http://purl.umn.edu/48038
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Food QUALITY VERIFICATION: WHO DO CONSUMERS TRUST? AgEcon
Hobbs, Jill E.; Innes, Brian G.; Uzea, Adrian D..
Food markets are increasingly characterized by an array of quality assurances with respect to credence attributes, many of which relate to agricultural production methods. A variety of organizations are associated with these quality assurance claims, including private, third party and public sector organizations. How do quality verifications from different sources affect consumer food choices? Who do consumers trust for assurances about credence attributes? This paper draws upon two recent studies to explore Canadian consumer attitudes toward environmental quality claims in a bread product and animal welfare quality claims in a pork product, along with attitudes toward quality verification from different sources. Analysis from two discrete choice...
Tipo: Conference Paper or Presentation Palavras-chave: Choice experiment; Animal welfare; Environment; Quality verification; Heterogeneity; Agricultural and Food Policy; Consumer/Household Economics; Demand and Price Analysis; Food Consumption/Nutrition/Food Safety; Food Security and Poverty; Health Economics and Policy; Q13; Q18; D12.
Ano: 2010 URL: http://purl.umn.edu/116425
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Forest owners' acceptance of incentive based policy instruments in forest biodiversity conservation - A choice experiment based approach AgEcon
Horne, Paula.
Finland has launched a new policy programme to encourage conservation of forest biodiversity, based on economic incentives and voluntarism on the part of non-industrial private forest owners. This study examined the factors that affect the acceptability of biodiversity conservation contracts and the amount of compensation needed in private forests, using the choice experiment method. Data were collected by surveying 3000 Finnish private forest owners. Analysing separately those respondents who were willing to enter into a conservation contract allowed an assessment of the impact of forest owners' heterogeneity on compensation amount.
Tipo: Conference Paper or Presentation Palavras-chave: Forest owners; Heterogeneity; Compensation; Land Economics/Use; Resource /Energy Economics and Policy.
Ano: 2004 URL: http://purl.umn.edu/59365
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Growth heterogeneity in rearing sea bass ( Dicentrarchus labrax): test of hypothesis with an iterative energetic model Inra
Campeas, A.; Brun-Bellut, J.; Baras, E.; Kestemont, P.; Gardeur, J.N..
This study aimed at modeling the relative importance of food intake on growth heterogeneity among cultured sea bass (Dicentrarchus labrax). First, we designed an individual growth model comprising five compartments (Energy intake, Losses, Net Energy, Recovered Energy and Maintenance). This model was calibrated with a first experiment carried out in eight tanks; A total of 130 juveniles (11 g) per tank were fed by a self-feeder (84 days, 20°C, 16L : 8D, 30 g NaCl/l). A second experiment was performed to better understand the relation between individual food intake, individual growth and growth heterogeneity, using the model as a tool for a hypothetico-deductive approach on growth heterogeneity (135 passive integrated transponder-tagged fish, same rearing...
Tipo: Journal Article Palavras-chave: Sea bass; Growth; Heterogeneity; Energic model.
Ano: 2009 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2010b57fb29&uri=/notices/prodinra1/2010/06/
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