Resultados de búsqueda - "statistics"

The effect of afforestation on water infiltration in the tropics: systematic review and meta-analysis por Ilstedt, Ulrik, Malmer, A., Verbeeten, E., Murdiyarso, Daniel

“…For the meta-analysis, the most common problems resulting in exclusion of otherwise relevant experiments were issues with the experimental design, and the absence of statistics (variances and replicates). Even considering the studies that were excluded in the meta analysis (a total of six), the low number of studies examining the effects of afforestation is a severe problem with respect to modelling and examining the underlying processes associated with the full range of different edaphic situations, different species and different methods of establishment.…”
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Morphological features of indigenous chicken populations of Ethiopia por Dana, N., Dessie, Tadelle, Waaij, E.H. van der, Arendonk, Johan A.M. van

“…Additional measurements on quantitative traits (shank length and body weight) were also included. Descriptive statistics (nonparametric and F tests) were used to analyze the data. …”
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Faecal excretion by ruminants and manure availability for crop production in semi-arid West Africa por Fernández Rivera, S., Williams, Timothy O., Hiernaux, Pierre H.Y., Powell, J.M.

“…A model is presented to predict the yearly faecal output by grazing ruminants under fluctuating feed supplies. Statistics on livestock population and cultivated areas are used to evaluate the effects of livestock to cropped area ratios and the spatial location of livestock at manuring time, on the potential amounts of manure available for crop production. …”
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Analysing the outcomes of forest policies in northern Vietnam: the role of policy design. Draft paper por Clement, Floriane

“…Recent large-scale afforestation programmes in Vietnam have had a mixed success. Official statistics report a forest cover increase, but the programmes' contribution to poverty reduction has been limited and their actual benefits to the environment are questionable. …”
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Fourier analysis of historical NOAA time series data to estimate bimodal agriculture por Canisius, F., Turral, Hugh, David, S.

“…When the amplitude of second harmonics in a sample region, where bimodal agriculture is predominant, was compared with the irrigated area statistics developed by FAOUF, a linear relationship was determined. …”
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Perception of Gujarat farmers on heat-tolerant potato varieties por Rana, R.K., Sharma, N., Kadian, M.S., Girish, B.H., Arya, S., Campilan, D., Pandey, S.K., Carli, C., Patel, N.H., Singh, B.P.

“…Heterogeneity of responses on various factors/attributes related to potato within farm categories was studied using Chi-square statistics.…”
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Assessment of professional training programmes in international agricultural research institutions: The case of ICRAF por Wanjiku, J., Mairura, Franklin S., Place, Frank

“…Survey questionnaires and telephone interviews were adopted. Descriptive statistics, logit regression, cross-tabulations and bi-plot analysis were used to analyze the data. …”
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El mejoramiento genético de la habichuela en América Latina: memorias de un taller, CIAT, Cali, Colombia, 11 al 15 de mayo de 1987 por Davis, J.H.C., Janssen, W.

“…The importance of including snap bean improvement as a research line in CIAT in its different aspects (sanity, improvement, economics, and statistics) was emphasized. All the participants in the meeting were committed to generate in their countries the necessary research to achieve real progress in the topic and serve growers all over the world. …”
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Trend analysis in reference evapotranspiration and aridity index in the context of climate change in Togo por Koffi D, Komla G

“…ETo was calculated using the FAO-56 Penman–Monteith method, and trends analyses were performed with non-parametric statistics proposed by Mann–Kendall and the Sen slope estimator. …”
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Adoption pattern of fertiliser technology among farmers in the ecological zones of southwestern Nigeria: a Tobit analysis por Bamire, A., Fabiyi, Y., Manyong, Victor M.

“…Data were analysed using descriptive statistics and Tobit regression techniques. A majority of the respondents in the study area are young and energetic but with low literacy level. …”
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The scope for reducing emissions from forestry and agriculture in the Brazilian Amazon por Börner, J., Wunder, Sven

“…We assess and compare the prospects of mitigating climate change through emission reductions from forestry and agriculture in the Brazilian Amazon. We use official statistics, literature, and case study material from both old and new colonization frontiers to identify the scope for emission reductions, in terms of potential additionality, opportunity costs, technological complexity, transaction costs, and risks of economic and environmental spillover effects. …”
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Employing a nondestructive method for the estimation of foliar area of quina (Cinchona officinalis) por Sueldo, Andrea, Chumbimune Vivanco, Sheyla Yanett, Mendoza, Erik, Salazar Coronel, Wilian, Minaya, Benjamin, Arbizu Berrocal, Carlos Irvin

“…Three young and mature leaves were evaluated on 18 quina seedlings. Descriptive statistics were obtained, and both methods were compared using the Kruskal–Wallis test, and a regression equation was estimated based on leaf width and length.…”
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Bayesian hierarchical modelling of the olive quick decline syndrome in south-eastern Italy por Vicent, Antonio, Martínez-Minaya, Joaquín, López-Quílez, Antonio, Conesa, David

“…In the last years, the use of complex statistical models has increased to improve our knowledge on the spread of diseases and the distribution of species, being of great interest in plant disease epidemiology. …”
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Land use intensity versus landscape complexity por Persson, Anna

“…We used spatially explicit digital data on land use, digitised aerial photographs, field surveys of landscape elements and agricultural statistics. A factor analysis suggests that there are three relevant axes, where the first can be interpreted as describing the intensity of land use while the other two are connected to landscape structure and amount of small patches of semi-natural habitat. …”
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Determinants of Tanzania rural households’ income diversification and its impact on food security por Ntwalle, Japhet Alfred

“…Results of descriptive statistics show that value of household productive asset, household size, climatic shock, household’s education level, and age are important determinants of household income diversification. …”

Analysis of consumer behavior toward organic food products in Sweden por Yadegari, Neda

“…Based on the responses from 110 Swedish consumers, the analysis using descriptive statistics, regression, ANOVA, reliability, and factor analysis shows that purchase intention and perceived behavioral control influence Swedish consumers' organic food purchase behavior, with intention having the strongest influence on behavior. …”

Geospatial monitoring and evaluation of UNESCO world heritage forest areas in the Tropics por Mukesh, Kumar

“…Supervised classification was selected for calculating area statistics inside and outside the UNESCO protected boundary because of the advantage of indicating the nature of changes. …”

Solar power investment under uncertainty por Sabel Douglas, Tom Duncan

“…The empirical analysis in this thesis is built using price data from Statistics Sweden and case-study data provided by the Swedish solar power company Save-by-Solar Sweden AB. …”
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Introducing a new tool for greenhouse gas calculation tailored for cropland: rationale, operational framework and potential application por Wassmann, Reiner, Pasco R, Zerrudo J, Ngo DM, Vo TBT, Sander, Björn Ole

“…The new features of SECTOR facilitate high flexibility in terms of entering newly obtained emission factors, easy data transfer from crop statistics for entering activity data and detailed specifications of GHG scenarios. …”
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Importance of considering technology growth in impact assessments of climate change on agriculture por Aggarwal, Pramod K., Vyas, Shalika, Thornton, Philip K., Campbell, Bruce M., Kropff, Martin

“…We carry out a systematic global review and compare published projections of climate change impacts from 34 studies and ∼4500 data points for the 2020s for maize, rice and wheat at country level with observed and forecasted national crop yields for the same period based on available global crop statistics. We find that observed yield changes are considerably higher than projected yield changes arising from climate change because technological improvements appear to have a large yield-enhancing impact compared with the negative effects of climate change, at least in the short term. …”
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