Resultados de búsqueda - "Parameter estimation."

Spatial analysis of soil fertility management using integrated household and GIS data from smallholder Kenyan farms por Staal, Steven J., Romney, Dannie L., Baltenweck, Isabelle, Waithaka, M.M., Muriuki, H., Njoroge, L.

“…Their use also allows the spatial prediction of uptake based on parameter estimates. The results show clearly the derived-demand nature of soil fertility services, based on markets for farm outputs. …”
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Factors affecting the growth of sheep and goats in West and Central Africa por Mbah D.A.

“…The need for genetic parameter estimates cannot be over emphasized. If informed designing of breeding programmes is to be made, the availability of required genetic and non-genetic factors influencing the growth of small ruminants in West and Central Africa is imperative.…”
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Spatial analysis of soil fertility management using integrated household and GIS data from smallholder Kenyan farms por Staal, Steven J., Romney, Dannie L., Baltenweck, Isabelle, Waithaka, M.M., Muriuki, H., Njoroge, L.

“…Their use also allows the spatial prediction of uptake based on parameter estimates. The results show clearly the derived-demand nature of soil fertility services, based on markets for farm outputs. …”
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Genetic and phenotypic parameters for growth and lamb survival traits of Farta and their crosses with Washera sheep in northwest Ethiopia: Inputs to design of breeding programs por Abebe, A.S., Alemayehu, K., Gizaw, Solomon, Johansson, A.M.

“…Overall, the present study showed that heritability is more likely to be overestimated if the maternal genetic and permanent environment effects are not taken into account. Parameters estimated in the current study can be used to design sheep breeding programs.…”
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Effect of different types and levels of errors in sire pedigree on the accuracy of genetic evaluation in crossbred goats por Tesema, Z., Deribe, B., Tilahun, M., Lakew, M., Getachew, T., Gizaw, Solomon

“…However, the genetic parameter estimates derived from the pedigree files with SIC were nears to estimates from the pedigree file with CPI. …”
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Analyzing the drivers of household dietary diversity: Evidence from Burkina Faso por Bandyopadhyay, Arkadeep, Haile, Beliyou, Azzarri, Carlo, Somé, Jérôme

“…We fit linear (for BI and HFDI) and Poisson (for HDDS) models controlling for several socioeconomic and climatic covariates. Results: Some parameter estimates are sensitive to the diversity metric with fewer significant covariates observed in the HFDI model. …”
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Price, inventories, and volatility in the global wheat market por Pietola, Kyösti, Liu, Xing, Robles, Miguel

“…Inventories imply price volatility, price volatility implies price, and price implies inventories, but not vice versa. The parameter estimates suggest that when inventories decrease, price volatility increases. …”
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Hybrid breeding of rice via genomic selection por Cui, Yanru, Li, Ruidong, Li, Guangwei, Zhang, Fan, Zhu, Tiantian, Zhang, Qifa, Ali, Jauhar, Li, Zhikang, Xu, Shizhong

“…SNP genotypes of the training population and parameters estimated from this training population are available for general uses and further validation in genomic hybrid prediction of all potential hybrids generated from all varieties of rice.…”
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The epidemiology of animal bite injuries in Uganda and projections of the burden of rabies por Fèvre, Eric M., Kaboyo, R.W., Persson, V., Edelsten, M., Coleman, P.G., Cleaveland, S.

“…From conservative parameter estimates, we estimate that in the absence of post‐exposure prophylaxis (PET), 592 (95% CI 345–920) deaths would occur, and that if one dose of PET is sufficient for protection following a rabid animal bite, 20 (95% CI 5–50) deaths would occur annually. …”
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Genetic and environmental effects on age at first calving and calving interval of naturally bred Boran(zebu) cows in Ethiopia por Haile-Mariam, M., Kassa-Mersha, H.

“…The corresponding c² values (ration of permanent environmental variance to total) were 0.031 and 0.028 for the respective data sets. Parameter estimates of the original data from bivariate analysis were 0.012 (h²), 0.065 (h²), -0.054 and -0.176 for the first CI, AFC, their genetic and environmental correlation, respectively. …”
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Analysis of technical efficiency among community-based seed producers in the savannas of Borno State, Nigeria por Amaza, P.S., Udoh, E.J., Abdoulaye, Tahirou, Kamara, A.Y.

“…Using the maximum likelihood estimation technique, asymptotic parameter estimates were evaluated to describe production inputs and efficiency determinants. …”
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How big is the potato (Solanum tuberosum L.) yield gap in Sub-Saharan Africa and why? A participatory approach por Harahagazwe, D., Condori, B., Barreda, C., Bararyenya, A., Byarugaba, A.A., Kude, D.A., Lung'aho, C., Martinho, C., Mbiri, D., Nasona, B., Ochieng, B., Onditi, J., Randrianaivoarivony, J.M., Tankou, C.M., Worku, A., Schulte-Geldermann, Elmar, Mares, V., Mendiburu, F. de, Quiróz, R.

“…The first finding was that model parameters estimated through participatory modelling using experts’ knowledge were good approximations of those obtained experimentally. …”
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An economic evaluation of adaptive e-learning devices to promote weight loss via dietary change for people with obesity por Miners, Alec, Harris, Jody, Felix, Lambert, Murray, Elizabeth, Michie, Susan, Edwards, Phil

“…Outcomes were expressed in terms of Quality-Adjusted Life-Years (QALYs) and costs were estimated from a health services perspective. All parameter estimates were derived from the literature. A systematic review was undertaken to derive the estimate of relative treatment effect. …”
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Estimating the burden of rhodesiense sleeping sickness during an outbreak in Serere, eastern Uganda por Fèvre, Eric M., Odiit, M., Coleman, P.G., Woolhouse, Mark E.J., Welburn, S.C.

“…While we modelled DALYs using standard methods, we also modelled uncertainty of our parameter estimates through a simulation approach. We distinguish between early and late stage HAT morbidity, and used disability weightings appropriate for the T.b. rhodesiense form of HAT. …”
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A risk assessment framework for seed degeneration: Informing an integrated seed health strategy for vegetatively-propagated crops por Thomas-Sharma, Sara, Andrade-Piedra, J.L., Carvajal-Yepes, Mónica, Hernández Nopsa, J.F., Jeger, Michael, Jones, Roger, Kromann, P., Legg, James P., Yuen, Jonathan, Forbes, G., Garrett, K.A.

“…We also illustrate the potential for expert elicitation to provide parameter estimates when empirical data are unavailable.…”
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Temporal progress of Septoria leaf spot on rabbiteye blueberry (Vaccinium ashei) por Ojiambo, P., Scherm, H.

“…A logistic model was fitted to disease severity data using nonlinear regression, and parameter estimates were used to compare the effects of leaf position on the shoot and shoot location in the canopy on disease progress. …”
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Genetic and phenotypic parameters and trends of reproduction traits in Kenya Boran cows por Okeyo Mwai, Ally, Mosi, R.O., Rege, J.E.O.

“…Variance components and genetic parameter estimates were obtained from univariate analyses within ranch, using the Derivative Free Restricted Maximum Likelihood (DFREML) program of Meyer (1991). …”
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Survival analysis of time to abscission of blueberry leaves affected by Septoria leaf spot por Ojiambo, P., Scherm, H.

“…When an accelerated failure time model was fitted to the data, the resulting parameter estimates indicated that each additional leaf spot present at harvest accelerated time to leaf abscission (expressed using late August as a starting point) by 1.9 and 4.5% in 2002 and 2003, respectively. …”
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Small mammal responses to farming practices in central Argentinian agroecosystems: the use of hierarchical occupancy models por Gómez, María Daniela, Goijman, Andrea Paula, Coda, José Antonio, Serafini, Vanesa N., Priotto, Jose Waldemar

“…The approach used in this study shows the importance of modelling imperfect detection, reducing bias in parameter estimates, and it should be implemented in similar studies.…”
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Impact of climate change on the productivity and adaptation of Ethiopia's Bonga and Menz sheep breeds por Tesema, Zeleke, Getachew, Tesfaye, Belay, Berhanu, Amha, Yosef, Rekik, Mourad, Rischkowsky, Barbara A., Besufkad, Shanbel, Abate, Zelalem, Bekele, Tamrat, Demissie, Teferi, Solomon, Dawit, Haile, Aynalem

“…This study used the 14 years (2009–2022) of productive, reproductive, pedigree, and climate data to derive resilience and stability phenotypes using a random regression model fitting to the reaction norm function and genetic parameter estimates were estimated from a linear mixed model. …”
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