


Registros recuperados: 38  

 


Hahn, Jinyong; Hirano, Keisuke; Karlan, Dean S.. 
Many social experiments are run in multiple waves, or are replications of earlier social experiments. In principle, the sampling design can be modified in later stages or replications to allow for more efficient estimation of causal effects. We consider the design of a twostage experiment for estimating an average treatment effect, when covariate information is available for experimental subjects. We use data from the first stage to choose a conditional treatment assignment rule for units in the second stage of the experiment. This amounts to choosing the propensity score, the conditional probability of treatment given covariates. We propose to select the propensity score to minimize the asymptotic variance bound for estimating the average treatment... 
Tipo: Working or Discussion Paper 
Palavraschave: Experimental design; Propensity score; Efficiency bound; Research Methods/ Statistical Methods; C1; C14; C9; C93; C13. 
Ano: 2009 
URL: http://purl.umn.edu/47107 
 

 

 

 

 


Lambert, Dayton M.; Florax, Raymond J.G.M.; Cho, SeongHoon. 
This research note documents estimation procedures and results for an empirical investigation of the performance of the recently developed spatial, heteroskedasticity and autocorrelation consistent (HAC) covariance estimator calibrated with different kernel bandwidths. The empirical example is concerned with a hedonic price model for residential property values. The first bandwidth approach varies an a priori determined plugin bandwidth criterion. The second method is a data driven crossvalidation approach to determine the optimal neighborhood. The third approach uses a robust semivariogram to determine the range over which residuals are spatially correlated. Inference becomes more conservative as the plugin bandwidth is increased. The datadriven... 
Tipo: Working or Discussion Paper 
Palavraschave: Spatial HAC; Semivariogram; Bandwidth; Hedonic model; Research Methods/ Statistical Methods; C13; C31; R21. 
Ano: 2008 
URL: http://purl.umn.edu/45964 
 


Thorat, V.A.; Dhekale, J.S.; Patil, H.K.; Tilekar, S.N.. 
The study has identified the factors responsible for ruralurban migration based on 120 sample respondents each of migrants and nonmigrants spread over two districts, viz. Ratnagiri and Sindhudurg of Konkan region of Maharashtra by employing the logit model. The study has highlighted the importance of rural development programs like MGNREGA that are being implemented by the government with a view to provide employment and income to the rural population in the country. It has also shown that for both migrant and nonmigrant households,, agriculture was the major source of income, and their consumption expenditure was more than the production expenditure. It has also been observed that migration has a positive impact on income, expenditure and net savings... 
Tipo: Article 
Palavraschave: Migration; Logit; Variable inflation factor; Odds ratio; Agricultural and Food Policy; J11; J61; C13; R23. 
Ano: 2011 
URL: http://purl.umn.edu/119399 
 


Gibson, Fiona L.; Burton, Michael P.. 
Observed and unobserved characteristics of an individual are often used by researchers to explain choices over the provision of environmental goods. One means for identifying what is typically an unobserved characteristic, such as an attitude, is through some data reduction technique, such as factor analysis. However, the resultant variable represents the true attitude with measurement error, and hence, when included into a nonlinear choice model, introduces bias in the model. There are well established methods to overcome this issue, which are seldom implemented. In an application to preferences over two water source alternatives for Perth in Western Australia, we use structural equation modeling within a discrete choice model to determine whether... 
Tipo: Working or Discussion Paper 
Palavraschave: Contingent valuation; Attitudes; Structural equation modeling; Recycled water; Environmental Economics and Policy; Research Methods/ Statistical Methods; Q51; Q53; C13. 
Ano: 2011 
URL: http://purl.umn.edu/103428 
 


Galarraga, Ibon; Markandya, Anil. 
The hedonic approach is used in this paper to estimate how much is paid for the fair trade/organic characteristic of the coffee in the British market. This information is later combined with the Quantity Based Demand System (QBDS) model developed by the authors and the Almost Ideal Demand System (AIDS) (Deaton and Muellbauer, 1980) to completely determine the demand function for different coffees. The QBDS model is easier to handle and less data demanding than the AIDS model in this study. Resumen El presente artículo se basa en la utilización del método hedónico para la estimación de la cantidad que se paga por la característica de "Orgánico/Comercio Justo" del café en el mercado británico. La información obtenida se combina después con el modelo... 
Tipo: Journal Article 
Palavraschave: Demand systems; Hedonic method; Coffee demand; Labelling; C13; C21; D12. 
Ano: 2004 
URL: http://purl.umn.edu/28732 
 

 

 

 

 

 


Diagne, Aliou; Sogbossi, MarieJosee; Simtowe, Franklin; Diawara, Sekou; Diallo, Abdoulaye Sadio; Barry, Alpha Bacar. 
The NERICA (New Rice for Africa) rice varieties, developed by the Africa Rice Center during the 1990s, are providing hopes for raising the productivity of upland rice farmers in Africa because of their reported high yield potential and adaptability to the African conditions. The varieties are new and not widely disseminated in farming communities and there is lot of interest in the donor community in knowing their potential for widespread adoption across subSaharan Africa (SSA). However, when a technology is new and the target population is not universally exposed it, the observed sample adoption rate and classical models of adoption widely used in adoption studies does not inform reliably on its potential adoption and constraint to it in the full... 
Tipo: Conference Paper or Presentation 
Palavraschave: NERICA varieties; Technology Diffusion and adoption; Average Treatment Effect; Guinea; International Development; Research Methods/ Statistical Methods; C13; O33; Q12; Q16. 
Ano: 2009 
URL: http://purl.umn.edu/51644 
 

 


Uaiene, Rafael N.; Arndt, Channing. 
This article provides estimates of farm household efficiency and its determinants among smallholder farmers in Mozambique. A translog stochastic frontier production function and a first difference model incorporating a model of farm household inefficiency effects are applied to test the existence of agricultural farm household inefficiencies and their determinants in Mozambique. The null hypothesis of equal farm household efficiency among households was rejected. Variation in farm household efficiency indicates that access to agricultural technology is a severe constraint for most farm households. Factors such as access to advisory services, access to rural credit, membership to an agricultural association, use of improved agricultural technology... 
Tipo: Conference Paper or Presentation 
Palavraschave: Stochastic frontier analysis; Farm production efficiency; Productivity Analysis; C12; C13. 
Ano: 2009 
URL: http://purl.umn.edu/51438 
 


Ghib, MarieLuce; BerrietSolliec, Marielle. 
Romanian rural areas contain the highest level of agricultural workers in the European Union, resulting in the challenge of stimulating nonagricultural employment. This paper uses the methodology of policy evaluation to analyse the influence of 3 measures the CAP. From an objectives tree to reveal the objectives of the programme to statistical analysis and field surveys, we analysed the pertinence, the coherence and the first results of those schemes. It was found that the targeted population was under estimated for one of the semisubsistence schemes. Choosing activities (tourism and enterprise) which are open to all rural society leads to enhanced competition between beneficiaries. Due to the global context of economic crisis, cofinancing can be met... 
Tipo: Conference Paper or Presentation 
Palavraschave: Rural policies; Policy evaluation; Small farms; Romania; Community/Rural/Urban Development; R58; O21; H72; C13. 
Ano: 2010 
URL: http://purl.umn.edu/94915 
 


Lence, Sergio H.. 
A thought experiment is designed to investigate whether the structure of risk aversion (i.e., the changes in absolute or relative risk aversion associated with changes in wealth) can be estimated with reasonable precision from agricultural production data. Findings strongly suggest that typical production data are unlikely to allow identification of the structure of risk aversion. A flexible utility parameterization is found to slightly worsen technology parameter estimates. Results also indicate that even under a restricted utility specification, utility parameter estimates are biased. Further, their quality is much worse when shocks are not large or samples are small. 
Tipo: Presentation 
Palavraschave: Expected utility; Risk preferences; Production analysis; Risk attitudes; Production Economics; Risk and Uncertainty; C13; D24; D81; Q12. 
Ano: 2008 
URL: http://purl.umn.edu/119534 
 
Registros recuperados: 38  


