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Registros recuperados: 11
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A quantitative analysis of forest fragmentation in Los Tuxtlas, southeast Mexico: patterns and implications for conservation RChHN
MENDOZA,EDUARDO; FAY,JOHN; DIRZO,RODOLFO.
Habitat loss is a critical threat to tropical biodiversity and its quantification constitutes a central conservation issue. Typically, assessments have been based on deforestation rates statistics. However, this overlooks the effects brought about by the spatial reconfiguration of the remaining habitat: fragmentation. We present an analysis of fragmentation in a Neotropical site aimed at: (a) devising a protocol for its quantification, (b) using such protocol to provide insights on the ecological consequences of fragmentation, (c) exploring its applicability to address the hypothesis that forest size-inequality decreases with elevation, an indicator of habitat accessibility. We applied the Gini coefficient (G) and the Lorenz curve to analyze fragment-size...
Tipo: Journal article Palavras-chave: Edge effect; Fragment shape; Gini coefficient; Lorenz curve; Tropical rain forest.
Ano: 2005 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2005000300008
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Determinants of Financial Performance of Commercial Dairy Farms. AgEcon
Johnson, James D.; El-Osta, Hisham S..
Data from the 1993 Farm Costs and Returns Survey were used in a multi-variate analysis framework to determine factors associated with the financial performance of commercial dairy farm operations. Statistical equivalency tests revealed regional differences in the way extensive indebtedness, size of operation, and labor cost affect net farm incomes. Regional differences were also found in terms of how milk production per cow, per-unit cost of purchased feed, and level of adoption of capital intensive technologies affect per-unit returns. Examination of the variation in the net farm income of commercial dairy farms using the method of coefficients of separate determination identified the size of the operation, regardless of the location of the farm business,...
Tipo: Report Palavras-chave: Financial performance; Net farm income; Technological adoption; Lorenz curve; Gini coefficient; Agricultural Finance; Livestock Production/Industries.
Ano: 1998 URL: http://purl.umn.edu/33561
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Determinants of Youth Poverty: A Zip Code Analysis AgEcon
Misra, Kaustav; Debertin, David L..
Estimation of Gini coefficients for various age groups indicates that Kentucky youth population is at risk. The paper determines the factors affecting youth poverty, employing Zip Code data. Analysis of outcomes provides suggestions for the policymakers to limit youth poverty in Kentucky.
Tipo: Conference Paper or Presentation Palavras-chave: Youth; Poverty; Zip Code; Gini coefficient; Lorenz curve; Logit model; Food Security and Poverty; I32; I39; R11.
Ano: 2007 URL: http://purl.umn.edu/34899
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DISPARITIES OF ENTREPRENEURIAL ACTIVITIES AMONG URBAN INDUSTRIES -- AN EXPLORATORY APPROACH AgEcon
Liang, Chyi-Lyi (Kathleen).
The results of an on-going exploratory study focused on disparities in entrepreneurial activities across 203 Metropolitan Statistical Areas among 18 industries in the US showed that there existed variations in the path of entrepreneurial development among MSAs and different industries. Resource allocation, market, policies, and supportive organizations could lead to these variations.
Tipo: Conference Paper or Presentation Palavras-chave: MSA; Entrepreneurship; Urban; Disparity; Gini coefficient; Community/Rural/Urban Development.
Ano: 2004 URL: http://purl.umn.edu/20405
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Distribuição locacional agropecuária e concentração fundiária na Bacia Hidrográfica dos Rios Mogi Guaçu e Pardo AgEcon
Ambrosio, Luis Alberto; Fasiaben, Maria Do Carmo Ramos; Romeiro, Ademar Ribeiro.
As relações entre a distribuição locacional dos usos da terra e a concentração fundiária, nos municípios da Bacia Hidrográfica dos Rios Mogi Guaçu e Pardo, são analisadas empregando o Quociente Locacional, a Curva de Especialização e o Índice de Gini. Os resultados mostram uma concentração fundiária excessivamente alta: metade dos municípios apresenta grau de concentração médio a forte (Índice de Gini entre 0,501 e 0,700) e metade grau forte a muito forte (Índice de Gini entre 0,701 e 0,900). Rejeitou-se, pelo teste qui-quadrado a 5% de probabilidade, a hipótese nula de independência entre as classes de concentração da posse da terra e os tipos de especialização locacional dos usos da terra, no âmbito municipal. Verificou-se que nos municípios com alto...
Tipo: Conference Paper or Presentation Palavras-chave: Bacia hidrográfica; Concentração fundiária; Curva de Especialização; Índice de Gini; Quociente locacional; Watershed; Location quotient; Specialization curve; Gini coefficient; Land concentration; Land Economics/Use.
Ano: 2008 URL: http://purl.umn.edu/108919
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Effects of red brick production on land use, household income, and greenhouse gas emissions in Khartoum, Sudan JARTS
Abdalla, Ishtiag; Abdalla, Sahar Babiker; El-Siddig, Kamal; Möller, Detlev; Buerkert, Andreas.
In Khartoum (Sudan) a particular factor shaping urban land use is the rapid expansion of red brick making (BM) for the construction of houses which occurs on the most fertile agricultural Gerif soils along the Nile banks. The objectives of this study were to assess the profitability of BM, to explore the income distribution among farmers and kiln owners, to measure the dry matter (DM), nitrogen (N), phosphorus (P), potassium (K) and organic carbon (C_org) in cow dung used for BM, and to estimate the greenhouse gas (GHG) emissions from burned biomass fuel (cow dung and fuel wood). About 49 kiln owners were interviewed in 2009 using a semi-structured questionnaire that allowed to record socio-economic and variable cost data for budget calculations, and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Brick kilns; Biomass fuel; Gini coefficient; GHG emissions; Return to land.
Ano: 2012 URL: http://www.jarts.info/index.php/jarts/article/view/2012061541345
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How do agricultural policies influence farmland concentration? The example of France AgEcon
Piet, Laurent; Desjeux, Yann; Latruffe, Laure; Le Mouel, Chantal.
Over the last decades, the number of farms has decreased while average farm size has increased in industrialised countries. We investigate whether these two concomitant trends have resulted in higher farmland concentration or not in the case of France. Deriving Gini coefficients as a measure of concentration from the estimation of parametric Lorenz curves, we show that this is not systematically the case at the sub-national scale of “départements”. When studying the role of possible explanatory variables for farmland concentration, we find that milk quotas, CAP 2nd pillar subsidies and so-called structural measures (settlements and early retirement grants) have a significant impact. However, the availability and the price of agricultural land appear to be...
Tipo: Conference Paper or Presentation Palavras-chave: Farmland concentration; Farm structures; Agricultural policies; Gini coefficient; France; Agricultural and Food Policy; Farm Management; Land Economics/Use.
Ano: 2010 URL: http://purl.umn.edu/61349
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Is Income Inequality Endogenous in Regional Growth? AgEcon
Hailu, Yohannes G.; Kahsai, Mulugeta S.; Gebremedhin, Tesfa G.; Jackson, Randall W..
This study focuses on testing the relationship between income inequality and growth within U.S. counties, and the channels through which such effects are observed. The study tests three hypotheses: (1) income inequality has an inverse relationship with growth; (2) regional growth adjustments are the channels through which the inequality and growth are equilibrated; and (3) income inequality is endogenous to regional growth and its adjustment. Results, based on a system of equations estimation, confirm the hypotheses that income inequality has a growth dampening effect; income inequality is endogenous to regional growth and growth adjustment; and the channels through which income inequality determines growth are regional growth adjustments, such as...
Tipo: Conference Paper or Presentation Palavras-chave: Income inequality; Economic growth; Gini coefficient; Growth modeling; Population change; Per capita income; Community/Rural/Urban Development; Public Economics; I32; J15; O18; P25; R11; R23; R25; R51; R53; R58.
Ano: 2009 URL: http://purl.umn.edu/46320
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Modelación del ingreso en México con un enfoque bayesiano. Colegio de Postgraduados
Montes Rivera, Fredy Yair.
En el presente trabajo se proponen tres distribuciones (Pareto, Lognormal y Dagum) para modelar el ingreso de la poblaci ón mexicana, lo anterior se realiz ó desde un enfoque bayesiano dado que en nuestro paí s no existe evidencia alguna de un trabajo con este enfoque. Una vez obtenidos los diferentes par ámetros de manera bayesiana de cada distribuci ón, se opta trabajar con la distribución Dagum ya que esta muestra mejor ajuste a los datos de ingreso en M éxico. Ya seleccionado el modelo se estiman los parámetros (a, b, p) de esta distribución con el uso del algoritmo "t-walk" el cual fue desarrollado por Christen y Fox (2010), esto se realizó para tres diferentes años (1998, 2002 y 2008), lo cual permiti ó realizar una comparaci ón acerca de como se...
Palavras-chave: Distribución pareto; Lognormal; Dagum; Algoritmo "t-walk"; Coeficiente de Gini; Curva de Lorenz; Pareto distribution; Gini coefficient; Lorenz curve; Maestría; Estadística; Algorithm "t-walk".
Ano: 2012 URL: http://hdl.handle.net/10521/708
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PROFIT PATTERNS IN THE U.S. AND THE WEST, 1992 AND 1997: WHAT COUNTY-LEVEL DATA REVEAL AgEcon
Korb, Penelope J.; Blank, Steven C.; Erickson, Kenneth W..
We examine whether there are spatial relationships in U.S. production agriculture's profitability across regions and over time. We test the traditional view that factor markets (approximately) adjust to equalize agriculture's net returns over space and time using county-level data from the UDSA's Census of Agriculture, 1992 and 1997. We estimate Gini coefficients and calculate the Theil Entropy Measure (TMI) to examine changes in the concentration of returns over space and time, and to decompose the variation in inequality in returns due to between-region variation in returns. Although factor markets (approximately) adjust to equalize net returns over space and time, there is still considerable variability in returns within regions and within states. Use...
Tipo: Conference Paper or Presentation Palavras-chave: Gini coefficient; Theil Entropy Measure; Net cash returns; Net cash and net farm income; Farm structure; Agricultural Finance; Community/Rural/Urban Development; Q; Q140.
Ano: 2004 URL: http://purl.umn.edu/36253
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Welfare Decomposition in the Context of the Life Cycle of Farm Operators: What Does a National Survey Reveal? AgEcon
El-Osta, Hisham S.; Morehart, Mitchell J..
This paper examines the role of the life cycle in impacting the distribution of a combined income and wealth measure using data from the 2001 and 2006 Agricultural Resource Management Survey. Such an assessment is made using both graphical representation of the distribution of the well-being measure along with utilization of the social welfare decomposition procedure. Results show a mild yet statistically insignificant improvement in the distribution of the economic measure over the five-year period. Contribution to social welfare is found highest among the cohort where the age of the head of household is between 45 and 54 years. Targeted programs are found to enhance social welfare if they are aimed towards cohorts where the age of the head of household...
Tipo: Journal Article Palavras-chave: ARMS; Economic well-being; Gini coefficient; Lorenz curve; Welfare decomposition; Consumer/Household Economics.
Ano: 2009 URL: http://purl.umn.edu/55705
Registros recuperados: 11
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