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An approach to calculate a Species Temperature Index for flora based on open data Naturalis
Sparrius, L.B.; Top, G.G. van den; Swaay, C.A.M. van.
To study the relation between changes in local plant communities and shifts in temperature, the temperature niches of the species need to be defined. We calculated the Species Temperature Index (STI) as a proxy for this niche. STI is defined as the mean annual temperature within the range of a species. In this paper, a method is described to calculate the STI for the European flora from open data provided by the Global Biodiversity Information Facility (GBIF) and WorldClim global climate data, for 7254 taxa of European vascular plants, bryophytes, algae, and ascomycetes including lichens. The algorithm accounts for incomplete and unbalanced species distribution data. The Community Temperature Index (CTI) is defined as the weighted mean of the STIs of a...
Tipo: Article / Letter to the editor Palavras-chave: Ascomycotina; Bryophytes; Climate change; GBIF; Open data; Plantae; R; Bootstrapping; STI; WorldClim.
Ano: 2018 URL: http://www.repository.naturalis.nl/record/669071
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Analysing Regional Sustainability Through a Systemic Approach: The Lombardy Case Study AgEcon
Caratti, Pietro; Ferraguto, Ludovico.
The intrinsic complexity of the sustainability concept challenges research towards more sophisticated ways to model and assess the dimensions underlying it. However, currently adopted modelling techniques and indicators frameworks are not able to give an integrated assessment through the different components of sustainability, providing incomplete visuals of the reality that they aim to catch. This paper tries to assess how the INSURE methodology can provide a contribution in the analysis of sustainability through indicator frameworks, describing its application to the Lombardy region (Italy). Developed on the course of a 6th European Framework Program – financed project to measure sustainability in the European regions, the methodology provides two...
Tipo: Working or Discussion Paper Palavras-chave: Sustainable Development; Regional Economics; Econometric and Input Output Models; Development Planning and Policy; Regional Analyses; Q01; R; R15; O2; O18.
Ano: 2008 URL: http://purl.umn.edu/37670
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Analysis of Spatial Variation in Flood Risk Perception AgEcon
Atreya, Ajita; Susana, Ferreira.
We use hedonic property models to estimate the spatial variation in flood risk in the city of Albany, GA. In addition to knowing whether a property is in the floodplain, we have a unique dataset with actual inundation maps from tropical storm Alberto that hit Albany in 1994. In the absence of information on the structural damages caused by a flood, having information on the actual inundated area can be useful to tease out information effect of a new flood from potential reconstruction cost. We find that the discount in actually inundated properties is larger which supports our hypothesis that homeowners respond better to what they have visualized (“seeing is believing”) and also the potential reconstruction cost in addition to information effect is...
Tipo: Presentation Palavras-chave: Flood Risk; Inundation; Spatial; Discount; Environmental Economics and Policy; Land Economics/Use; Q; R.
Ano: 2012 URL: http://purl.umn.edu/119738
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Atouts et faiblesses du logiciel R en enseignement, recherche et industrie Inra
Cornillon, P.A.; Matzner-Lober, E..
Dans cette conférence, nous aborderons le logiciel R sous trois aspects : son utilisation en enseignement, en recherche et dans le monde de l'entreprise. Pour chacune de ces trois utilisations, il est nécessaire d'évaluer les demandes spécifiques du domaine et les réponses qu'apporte le logiciel R. Rappelons brièvement que le logiciel R est multi-plateforme et multi-OS. Il est entièrement gratuit, très complet et offre à la fois des commandes mais aussi des menus déroulants. Il est donc raisonnable de penser que ce logiciel fera partie des logiciels de statistique les plus enseignés. Sa facilité de programmation et sa forte utilisation dans le monde de la recherche en font dès aujourd'hui un language omniprésent. On peut donc s'interroger sur les futures...
Tipo: Conference Paper Palavras-chave: LOGICIEL R; R; LOGICIEL LIBRE; LOGICIEL DE STATISTIQUE R SOFTWARE; PACKAGE; FREE SOFTWARE; STATISTICAL SOFTWARE.
Ano: 2009 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2010babde8a&uri=/notices/prodinra1/2010/12/
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COASTAL MAPPING AND KITESURFING ArchiMer
Barde, J.; Bonhommeau, Sylvain; Chassot, E.; Motah, B..
ollecting data on aquatic biodiversity is very challenging because of the difficulty to access underwater ecosystems. Over the years, field surveys have become easier and cheaper with the development of low cost electronics. Commercial and recreational vessels, including sailboats, can now substantially complement expensive scientific surveys and arrays of observation buoys deployed across the world oceans (Pesant et al., 2015, Karsenti et al., 2011). Meanwhile, a large variety of marine animals such as birds, mammals, and fish have become data collection platforms for both biological and environmental parameters through the advent of archival tags. It becomes obvious that data collection in coastal and high seas will become more popular and that citizen...
Tipo: Text Palavras-chave: Citizen science; Ocean and coastal observing systems; Surfing; Action cameras; Coral reef mapping; Photogrammetry; Deep learning; R.
Ano: 2018 URL: http://archimer.ifremer.fr/doc/00450/56164/57712.pdf
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Funções de pedotransferência para estimativa da densidade dos solos de áreas tropicais montanhosas Repositório Alice
CARVALHO JUNIOR, W. de; CHAGAS, C. da S.; CALDERANO FILHO, B.; BHERING, S. B..
O desenvolvimento de funções de pedotransferência (FPT) para a estimativa de valores de densidade dos solos deve ser feita de levando em consideração os aspectos regionais onde se encontram os solos. A utilização de FPT de outras áreas, em geral mostra resultados inferiores aqueles estimados por funções desenvolvidas com dados da área de estudo. Forma usados 73 horizontes de solos com os dados de densidade para gerar 3 FPTs. A FPT1 utilizou como preditores 32 variáveis, e as FPT2 e FPT3 usaram 12 variáveis cada. Os valores de r2 mostraram melhor performance da FPT1 e FPT2, e significativamente diferentes da FPT3, que teve o pior desempenho. A FPT2 foi escolhida para estimar a densidade do solo dos 416 horizontes sem esta análise, e apresentou valor médio...
Tipo: Artigo em anais de congresso (ALICE) Palavras-chave: R; Regressão linear; Stepwise.
Ano: 2013 URL: http://www.alice.cnptia.embrapa.br/handle/doc/966643
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How to Realize Breakthrough in WTO Doha Negotiations? AgEcon
Zhou, Jian-Ming.
Originally published by ‘Africa Link’ (www.africalink.ch/), Headquarters in Switzerland, at (http://www.africalink.ch/index.php?option=com_content&view=article&id=12993%3Ahow-torealize- breakthrough-in-wto-doha-negotiations&catid=49%3Abusiness-andeconomy& Itemid=58 =en)
Tipo: Working or Discussion Paper Palavras-chave: Breakthrough; WTO; Doha negotiations; Agriculture; Non-agricultural market; Agricultural and Food Policy; Community/Rural/Urban Development; Environmental Economics and Policy; Farm Management; Food Security and Poverty; Institutional and Behavioral Economics; International Development; International Relations/Trade; Labor and Human Capital; Political Economy; Production Economics; Productivity Analysis; Resource /Energy Economics and Policy; F; K; O; P; Q; R.
Ano: 2010 URL: http://purl.umn.edu/97047
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La redes neuronales artificiales feedforward como identificadoras de asociaciones espurias entre caminatas aleatorias Colegio de Postgraduados
Vázquez López, Juan Pedro.
Una regresión espuria es la presencia de una asociación entre variables inde- pendientes; y se presenta evidencia de ella cuando no se rechaza la hipótesis H0 : β1 = 0 al hacer dicha regresión. Desde la década de 1970 se había demostra- do que la regresión espuria es un fenómeno frecuente en caminatas aleatorias. Su identificación es de interés principalmente en la Econometría. En este traba jo se propone el empleo de una red neuronal artificial feedforward multicapa como herramienta de detección de regresión espuria entre caminatas aleatorias, siendo la pendiente cero de la respuesta de la red y la aceptación de la hipótesis sobre la media poblacional H 0 : δ1 = 0 en la respuesta de la red como variable dependiente de zt , un indicio de la no...
Tipo: Tesis Palavras-chave: Redes neuronales artificiales; Regresiones espurias; Caminatas aleatorias; R; AMORE Artificial neural networks; Spurious regression; Random walk; R; AMO- RE.
Ano: 2012 URL: http://hdl.handle.net/10521/1075
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La redes neuronales artificiales feedforward como identificadoras de asociaciones espurias entre caminatas aleatorias Colegio de Postgraduados
Vásquez López, Juan Pedro.
Una regresión espuria es la presencia de una asociación entre variables inde- pendientes; y se presenta evidencia de ella cuando no se rechaza la hipótesis H0 : β1 = 0 al hacer dicha regresión. Desde la década de 1970 se había demostra- do que la regresión espuria es un fenómeno frecuente en caminatas aleatorias. Su identificación es de interés principalmente en la Econometría. En este traba jo se propone el empleo de una red neuronal artificial feedforward multicapa como herramienta de detección de regresión espuria entre caminatas aleatorias, siendo la pendiente cero de la respuesta de la red y la aceptación de la hipótesis sobre la media poblacional H 0 : δ1 = 0 en la respuesta de la red como variable dependiente de zt , un indicio de la no...
Tipo: Tesis Palavras-chave: Redes neuronales artificiales; Regresiones espurias; Caminatas aleatorias; R; AMORE; Maestría; Cómputo Aplicado; Artificial neural networks; Spurious regression; Random walk.
Ano: 2008 URL: http://hdl.handle.net/10521/1377
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Migrants’ International Transfers and Educational Expenditure: Empirical Evidence from Albania AgEcon
Cattaneo, Cristina.
The present paper analyses the expenditure behavior of Albanian families. The objective is to cast some light upon the relationship between education expenditure and the volume of remittances, sent from abroad by household members. To assess the existence of an education enhancing effect of remittances, an Engel curve framework is employed, where heterogeneity in interests or in bargaining power among the members within the households is assumed. The empirical estimation accounts for the censored nature of the education expenditure through using Heckman two-step as well as a semiparametric model for sample selection. Finally, quintile regression analysis is employed to investigate whether migrants’ remittances have a differentiated effect on various...
Tipo: Working or Discussion Paper Palavras-chave: Migrant Remittances; Engel Curves; Education Expenditure; Labor and Human Capital; R; J.
Ano: 2010 URL: http://purl.umn.edu/59373
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Overcoming Inefficient Land-Holding of Part-Time and Absent Small Farmers - A Challenge to Nobel Economics Laureate Theodore W. Schultz AgEcon
Zhou, Jian-Ming.
Paper presented at the International Symposium Sustaining Food Security and Managing Natural Resources in Southeast Asia - Challenges for the 21st Century Organized by University of Hohenheim, Germany Chiang Mai University and Kasetsart University, Thailand International Center for Research in Agroforestry, and International Board for Soil Research and Management 8-11 January 2002 at Chiang Mai University, Thailand
Tipo: Conference Paper or Presentation Palavras-chave: Part-time and absent small farmers; Inefficient land-holding; Low and high income economy; Economies of scale; Obliged lease of unused land to full-time farmers.; Agricultural and Food Policy; Community/Rural/Urban Development; Farm Management; Food Security and Poverty; Institutional and Behavioral Economics; International Development; Labor and Human Capital; Land Economics/Use; Political Economy; Production Economics; Productivity Analysis; B; O; Q; R.
Ano: 2002 URL: http://purl.umn.edu/95864
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Tutoriel d’extraction des données des fichiers satellite GeoTIFF. Utilisation des logiciel QGIS et R ArchiMer
Lampert, Luis.
Ce tutoriel aborde les méthodes d’extraction des données des images satellite au format GéoTIFF. Ils sont décrits les outils et méthodes pour la définition des zones d’extraction ainsi que les scripts en R pour leur extraction et mise en forme.
Tipo: Text Palavras-chave: Fichiers geotiff; Images satellite; R; QGIS.
Ano: 2018 URL: http://archimer.ifremer.fr/doc/00423/53405/54279.pdf
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