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Registros recuperados: 41
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Estimación de volumen, biomasa y carbono aéreo en tres especies arbóreas de Pluma Hidalgo, Oaxaca. Colegio de Postgraduados
Aquino Ramírez, Martín.
Los reservorios y el potencial de almacenamiento de la cantidad biomasa y carbono se desconocen en la mayoría de los bosques tropicales de México, por lo que es importante realizar estimaciones precisas mediante el desarrollo de ecuaciones alométricas para conocer su variación espacial y temporal presente en los ecosistemas forestales. El presente estudio se realizó en el municipio de Pluma Hidalgo, Oaxaca, México, perteneciente a la región fisiográfica de la Sierra Madre del Sur, con el objetivo de desarrollar ecuaciones para estimar volumen comercial, biomasa y carbono aéreo total en las especies Cupania dentata DC., Alchornea latifolia Sw. e Inga punctata Willd. Se aplicó un muestreo destructivo a 48 árboles de los que se obtuvieron muestras de los...
Palavras-chave: Árboles tropicales; Análisis de regresión; Variable indicadora; Ecuaciones alométricas; Concentración de carbono; Tropical trees; Regression analysis; Indicator variable; Allometric equations; Carbon concentration; Ciencias Forestales; Maestría.
Ano: 2014 URL: http://hdl.handle.net/10521/2333
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Uso de informações ambientais na modelagem e interpretação da interação genótipo x ambiente: revisão bibliográfica. Infoteca-e
COSTA NETO, G. M. F.; DUARTE, J. B.; CASTRO, A. P. de; HEINEMANN, A. B..
A identificação dos fatores causais da interação genótipo x ambiente (GE) e a quantificação destes sobre a variação residual, não explicada pelos efeitos principais, são elementos-chave para o entendimento da adaptação fenotípica. Nos programas de melhoramento há a necessidade da tomada de decisões, como selecionar as linhagens nos ensaios multiambientais (MET). Métodos analíticos vinculados a protocolos de ambientipagem (caracterização ambiental) possibilitam inferências úteis à tomada de decisão, como a identificação de fatores ambientais e genotípicos determinantes da interação GE, a adaptabilidade e a estabilidade contempladas em função de fatores climáticos, edáficos e bióticos, a localização geográfica e o manejo cultural, a perspectiva de avaliação...
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E) Palavras-chave: Regressão analítica; Interação genótipo x ambiente; Interação Genética; Genótipo; Sistema de Informação Geográfica; Condição Ambiental; Genotype-environment interaction; Regression analysis; Geographic information systems.
Ano: 2020 URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1124389
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Use of rotavirus virus-like particles as surrogates to evaluate virus persistence in shellfish ArchiMer
Loisy, Fabienne; Atmar, R; Le Saux, Jean-claude; Cohen, J; Caprais, Marie-paule; Pommepuy, Monique; Le Guyader, Soizick.
Rotavirus virus-like particles (VLPs) and MS2 bacteriophages were bioaccumulated in bivalve mollusks to evaluate viral persistence in shellfish during depuration and relaying under natural conditions. Using this nonpathogenic surrogate virus, we were able to demonstrate that about 1 log(10) of VLPs was depurated after 1 week in warm seawater (22 degrees C). Phage MS2 was depurated more rapidly (about 2 log(10) in 1 week) than were VLPs, as determined using a single-compartment model and linear regression analysis. After being relayed in the estuary under the influence of the tides, VLPs were detected in oysters for up to 82 days following seeding with high levels of VLPs (concentration range between 10(10) and 10(9) particles per g of pancreatic tissue)...
Tipo: Text Palavras-chave: Seawater; Viral diseases; Bioaccumulation; Depuration; Contamination; Model; Pancreas; Regression analysis; Shellfish; Phages; Virus.
Ano: 2005 URL: http://archimer.ifremer.fr/doc/2005/publication-1233.pdf
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Prediction of Stature According to Three Head Measurements International Journal of Morphology
Rexhepi,Agron M; Brestovci,Behlul.
Morphometry is a non-invasive method important to assess the size, proportions, and composition of the human body. Because the prediction is an important subject in almost all life sciences, the aim of this research was to find out the cephalofacial variables that may predict the body height. Three cephalofacial variables and the body height were measured on 288 adult male subjects of the Kosovo Albanian population, aged 18­35 years old. Using the procedures of regressive analysis we found that cephalofacial variables: head height, head circumferences, face height, significantly may predict body height, and in this way we derived the specific regression equation for estimation of the body height, based on these cephalofacial variables. The predicted body...
Tipo: Journal article Palavras-chave: Morphometry; Cephalofacial variables; Stature; Regression analysis.
Ano: 2015 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000300055
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Cranial Capacity in an Adult Sri Lankan Population: Sexual Dimorphism and Ethnic Diversity International Journal of Morphology
Ilayperuma,I.
Cranial capacity exerts a close correlation with the volume of the brain. A large body of evidence shows a clear racial variation in cranial dimensions. Therefore detailed knowledge of the population specific data on biometric features of the cranial cavity is important in the study and comparison of the crania of populations from different racial backgrounds, assessing growth and development of an individual and in the diagnosis of any abnormalities of cranial size and shape. Despite its significance, little is known concerning the cranial capacity in Sri Lankans. Hence, the present study was undertaken to establish the cranial capacity in an adult Sri Lankan population. A total of 210 subjects with an age span of 20-23 years were included in the study....
Tipo: Journal article Palavras-chave: Cranial capacity; Linear dimensions; Regression analysis; Sri Lanka.
Ano: 2011 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000200029
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On the Prediction of Personal Stature from Cranial Dimensions International Journal of Morphology
Ilayperuma,Isurani.
Dimensional relationship between body segments and stature has been the focus of scientists for many years. All such studies were based on the fact that body segments exhibit consistent ratios relative to the stature and these ratios are linked to age, gender and race. Racial characters are best defined in the skull. Therefore, prediction of stature from cranial remains is vital in establishing the identity of an unknown individual. Despite its significance, little is known concerning the cranial dimensions in Sri Lankans. Hence, this study was designed to investigate the relationship and to propose a gender and age specific linear regression model between the cranial dimensions and height of an individual. A total of 400 subjects with an age span of 20-23...
Tipo: Journal article Palavras-chave: Cranial dimensions; Stature; Regression analysis; Sri Lanka.
Ano: 2010 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000400024
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Predictive determinants of scorpion stings in a tropical zone of south Iran: use of mixed seasonal autoregressive moving average model J. Venom. Anim. Toxins incl. Trop. Dis.
Ebrahimi,Vahid; Hamdami,Esmael; Moemenbellah-Fard,Mohammad Djaefar; Jahromi,Shahrokh Ezzatzadegan.
Abstract Background: More than 1.2 million scorpion stings occur annually worldwide, particularly in tropical regions. In the absence of proper medical care, mortality due to venomous scorpion stings is an important public health issue. The aim of the present study is to explore the temporal trend of scorpionism with time series models and determine the effective factors on this event using regression models. Methods: A retrospective cross sectional study was conducted on 853 scorpion stung patients. They were referred to Haji-Abad Hospital of Hormozgan University of Medical Sciences (HUMS), south Iran, from May 2012 to July 2016. A linear model to describe and predict the monthly trend of scorpion sting cases is fit with autoregressive moving average...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Climate; Mixed seasonal ARMA; Regression analysis; Scorpion; Scorpion stings; Time series; Iran.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1678-91992017000100315
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Screening for ketosis using multiple logistic regression based on milk yield and composition OAK
KAYANO, Mitsunori; KATAOKA, Tomoko; 茅野, 光範.
Multiple logistic regression was applied to milk yield and composition data for 632 records of healthy cows and 61 records of ketotic cows in Hokkaido, Japan. The purpose was to diagnose ketosis based on milk yield and composition, simultaneously. The cows were divided into two groups: (1) multiparous, including 314 healthy cows and 45 ketotic cows and (2) primiparous, including 318 healthy cows and 16 ketotic cows, since nutritional status, milk yield and composition are affected by parity. Multiple logistic regression was applied to these groups separately. For multiparous cows, milk yield (kg/day/cow) and protein-to-fat (P/F) ratio in milk were significant factors (P<0.05) for the diagnosis of ketosis. For primiparous cows, lactose content (%), solid...
Palavras-chave: Herd test; Metabolic disorder; Perinatal disease; P/F ratio; Regression analysis.
Ano: 2015 URL: http://ir.obihiro.ac.jp/dspace/handle/10322/4221
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Reconstrucción de la distribución de tallas de abadejo (Genypterus blacodes) a partir de una distribución de longitudes de cabeza. OceanDocs
Villarino, M.F.; Aubone, A..
The total length distribution of pink cuskeel Genypterus blacodes catches is difficult to obtain. On the contrary, it is easy to have access to the head length distribution. So, the purpose of this study was to obtain a relationship between a certain head measurement and total length to estimate the length distribution of the catches. Individuals were obtained from bottom-trawl surveys between 39°-47°S and the San Jorge Gulf of the Argentine sea. Sets of measurements of total length (LT), maxillar length (Lmax), head length (Lc),orbital length (Lo), preorbital length (Lpo) and head length-total length ratio (r=Lc/LT) by sex were obtained. The total length was estimated with a regression model using the head length as independent variable. No significant...
Tipo: Journal Contribution Palavras-chave: Size distribution; Regression analysis; Fishery surveys; Regression analysis; Http://aims.fao.org/aos/agrovoc/c_16335.
Ano: 2000 URL: http://hdl.handle.net/1834/2532
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The abundance, biomass and composition of pelagic ciliates in East African lakes of different salinity and trophy OceanDocs
Yasindi, A. W.; Taylor, W. D..
Planktonic ciliates were studied in 17 tropical East African lakes of different salinity and trophic status. Oligotrichs (e.g., Strombidium, Strobilidium and Halteria) and scuticociliates (e.g., Cyclidium, Pleuronema, Cristigera), dominated the ciliate communities. Conductivity and trophic status were the most important environmental variables influencing the distribution of ciliate species in East African lakes. Herbivorous oligotrichs were important in oligotrophic and mesotrophic lakes, as they are in temperate and subtropical lakes, but their importance decreased with increasing chlorophyll a concentration and conductivity. On the other hand, the importance of scuticociliates (primarily bacterivores) increased with increasing chlorophyll a and...
Tipo: Proceedings Paper Palavras-chave: Freshwater lakes; Abundance; Biomass; Pelagic environment; Salinity; Plankton; Community composition; Oligotrophic lakes; Aquatic communities; Regression analysis; Tropical lakes; Species diversity; Plankton; Freshwater.
Ano: 2006 URL: http://hdl.handle.net/1834/5311
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Macro policies and investment priorities for irrigated agriculture in Vietnam AgEcon
Barker, Randolph; Ringler, Claudia; Tien, Nguyen Minh; Rosegrant, Mark W..
Tipo: Report Palavras-chave: Irrigated farming; Investment policy; Irrigation management; Marketing; Trade policy; Public finance; Water law; Regression analysis; Agricultural credit; Households; Agricultural and Food Policy; Agricultural Finance; Marketing; Resource /Energy Economics and Policy.
Ano: 2004 URL: http://purl.umn.edu/92833
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Recent Changes in Milk Marketing in the UK: The Farmers' Perspective AgEcon
Franks, J.R..
In 1994 Milk Marketing Boards in the UK were disbanded, their role as milk purchasers was taken by more than 100 licensed organisations. It is shown that this change resulted in an increase in the variation between producers' milk price. The majority of dairy farmers sold milk through the Milk Marketing Boards designated successor; a farmer owned co-operative called Milk Marque. In doing so they accepted a 1.5 ppl milk price penalty. It is shown farmers who adopted this strategy did so because of the perceived financial security of Milk Marque, goodwill and support for the principle of co-operative marketing and in an attempt to protect the milk price over the longer-term. The marketing environment changed once again in 2000 when Milk Marque was disbanded....
Tipo: Conference Paper or Presentation Palavras-chave: Co-operative marketing; Milk prices; Regression analysis; Logit analysis; Agribusiness; Demand and Price Analysis.
Ano: 2002 URL: http://purl.umn.edu/6969
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Multiple regression analysis of the net income and consumption expenditure of Chinese rural households during 2007 AgEcon
Da, Wa; Xiao, Hong; Zhuo, Ma.
We use the regression analysis method of multivariate statistical analysis to establish a multiple linear regression model about the net income and consumption expenditure of Chinese rural households during the year 2007. This paper analyzes the internal relation between the net income and consumption expenditure of Chinese rural households according to the regression result. Some reasonable suggestions are put forward for raising the income of rural households and stimulating consumption.
Tipo: Thesis or Dissertation Palavras-chave: Rural households; Income; Expenditure; Regression analysis; China; Consumer/Household Economics; Financial Economics; Research Methods/ Statistical Methods.
Ano: 2009 URL: http://purl.umn.edu/53439
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Assessment of participatory management of irrigation schemes in Sri Lanka: Partial reforms, partial benefits AgEcon
Samad, Madar; Vermillion, Douglas Lynn.
Describes the application of a standard methodology developed by IWMI to assess the impact of irrigation management transfer on the performance of irrigation schemes. Includes detailed analysis of the effects of participatory management on the performance of irrigation schemes in Sri Lanka.
Tipo: Report Palavras-chave: Privatization; Policy; Performance evaluation; Indicators; Operating costs; Irrigation management; Economic aspects; Returns; Participatory management; Farmer participation; Government managed irrigation systems; Small scale systems; Large-scale systems; Regression analysis; Models; Agribusiness; Agricultural Finance; Community/Rural/Urban Development; Farm Management; Research and Development/Tech Change/Emerging Technologies.
Ano: 1999 URL: http://purl.umn.edu/44577
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Driving Factors and Model of Change in Arable Land Area in China AgEcon
Lei, Zhanbo; Du, Haowen.
We analyze the characteristics of the change in arable land area in China according to the change data of arable land area and other relevant data from the year 1996 to 2006, and adopt Factor Analysis Method and Stepwise Regression Method to carry out quantitative analysis on the driving factors of arable land change of China. We also establish the regression model of driving factors and arable land area. Finally, some corresponding suggestions are put forward.
Tipo: Thesis or Dissertation Palavras-chave: Arable land; Driving factor; Factor analysis; Regression analysis; China; Land Economics/Use; Research Methods/ Statistical Methods.
Ano: 2009 URL: http://purl.umn.edu/53592
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Research on Rural Consumer Demand in Hebei Province Based on Principal Component Analysis AgEcon
Ma, Hui-zi; Zhao, Bang-hong; Xuan, Yong-sheng.
By selecting me time sequence data concerning influencing factors of rural consumer demand in Hebei Province from 2000 to 2010, this paper uses the principal component analysis method in multiplex econometric statistical analysis, constructs the principal component of consumer demand in Hebei Province, conducts regression on the dependent variable of consumer spending per capita in Hebei Province and the principal component of consumer demand so as to get principal component regression, and then conducts quantitative and qualitative analysis on the principal component. The results show that total output value per capita (yuan), employment rate, and income gap, are correlative with rural residents' consumer demand in Hebei Province positively; consumer...
Tipo: Journal Article Palavras-chave: Consumer demand; Principal component analysis; Regression analysis; Hebei Province; China; Agribusiness.
Ano: 2011 URL: http://purl.umn.edu/117256
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Determinants of Trust between Buyers and Suppliers in Agribusiness: Empirical Evidence from the German Pork Sector AgEcon
Schulze, Birgit; Spiller, Achim.
There are several hints that there is lack of trust in the relationships between farmers and processors in the meat industry. To generate instruments of trust management, a survey is conducted in the German pork chain measuring the level of trust perceived by farmers as well as the antecedents of trust. Overall satisfaction, the perceived neutrality of the carcass grading system, fairness and farmer orientation are the most import factors explaining trust.
Tipo: Conference Paper or Presentation Palavras-chave: Satisfaction; Reliability; Regression analysis; Pork chain; Agribusiness; Livestock Production/Industries.
Ano: 2006 URL: http://purl.umn.edu/7719
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WER GEHT NOCH AN DIE THEKE? ERGEBNISSE EINER VERBRAUCHERSTUDIE ZU SB-FLEISCH AgEcon
Schulze, Birgit; Spiller, Achim.
The German meat market is facing considerable changes. Along with the boom of case-ready and discount stores, butchers and smaller retailers loose market shares, and private labels become widely accepted. The consumers' preferences are often neglected by these trends. This contribution discusses the German case-ready trend on the basis of an extensive literature review and a consumer survey. A target group of high-income consumers with high preference for meat counters is identified. Consumers who currently buy case-ready meat are acting rather due to price advantages than for reasons of technical advantages such as longer storage life. International examples show that in such a situation it is up to the retailers, if meat counters can survive. Der...
Tipo: Conference Paper or Presentation Palavras-chave: Discountereffekt; Kaufverhalten; Regressionsanalyse; Zielgruppen; Discount store effect; Buying behaviour; Regression analysis; Target groups; Consumer/Household Economics.
Ano: 2007 URL: http://purl.umn.edu/7570
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Perspectives of small retailers in the organic market: Customer satisfaction and customer enthusiasm AgEcon
Bolten, Jan; Kennerknecht, Raphael; Spiller, Achim.
In this paper we discuss the impact of customer satisfaction and enthusiasm on the performance of small retailers in the organic food market. The analysis of customer satisfaction and shop data confirm essential economic effects. The study is based on 948 customer interviews and an analysis of management ratios of 12 organic food shops in Germany. The results show that customer satisfaction is a relevant key to sales performance. Regression analysis reveals that overall customer satisfaction accounts for 32 % of sales per square meter sales area. An additional factor analysis identifies service and product quality as main determinant s of customer satisfaction. Consumer s consider the freshness of fruit and vegetables as representative for the quality of...
Tipo: Conference Paper or Presentation Palavras-chave: Retail marketing; Success factor; Organic marketing; Regression analysis; Demand and Price Analysis; Food Consumption/Nutrition/Food Safety.
Ano: 2006 URL: http://purl.umn.edu/10042
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Adjusting prices for volume: a test of the Hotelling valuation principle AgEcon
Berck, Peter.
This paper tests the hypothesis that the net of extraction cost price of a natural resource does not change with volume. The hypothesis is shown to he a consequence of Hotelling’s theory. The tests are performed on equations estimated by a nonparametric regression (ACE), and we show that the usual least squares estimation techniques are not general enough to successfully perform the test. The test rejects the pure form of the Hotelling theory and shows that it is necessary to adjust sale prices for volume sold.
Tipo: Working or Discussion Paper Palavras-chave: Natural resources; Prices; Regression analysis.
Ano: 1988 URL: http://purl.umn.edu/43665
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