scholarly journals Redução do número de empreendimentos agrícolas no Brasil

2022 ◽  
Vol 60 (spe) ◽  
Author(s):  
Tiago Santos Telles ◽  
Gustavo Henrique Leite de Castro ◽  
Thiago Luiz Ragugnetti Furlaneto ◽  
Gustavo Vaz da Costa
Keyword(s):  
Log Linear

Resumo: Questões relacionadas aos empreendimentos agrícolas vêm sendo discutidas em todo o mundo, o que ocorre pela importância deles no desenvolvimento econômico das nações, por estarem diretamente relacionados às transformações sociais dentro e fora do campo e por serem imprescindíveis para a produção e a oferta de alimentos, bem como para a segurança alimentar. Neste contexto, o objetivo deste estudo foi caracterizar as tendências de variação no número de empreendimentos agrícolas no Brasil, por tipo de atividade principal e por estrato de área, para o período de 2004 a 2015. Para tanto, foram utilizados dados da Pesquisa Nacional por Amostra de Domicílios e calculadas as taxas médias de variação anual, por meio do teste t de Student, utilizando uma regressão dos mínimos quadrados ordinários na forma log-linear. Entre 2004 e 2015, foi constatada queda de 3,3% a.a. no número de empreendimentos agropecuários no Brasil, totalizando uma redução de 1.382.700 unidades produtivas. Também foi observado que as reduções mais intensas ocorreram nos empreendimentos agrícolas dedicados à produção de arroz (–13,4% a.a.), nos de lavouras temporárias (–12,5% a.a.) e naqueles com área de ≥ 50 a < 100 hectares (–4,5% a.a.). Tais constatações são relevantes e permitem o delineamento de ações voltadas à segurança alimentar e nutricional no Brasil.

When and why are log-linear models self-normalizing?

2015 ◽  
Author(s):  
Jacob Andreas ◽  
Dan Klein
Keyword(s):  
Linear Models ◽  
Log Linear

Impact of Training and Development Programmes on the Productivity of Employees in the Banks

2016 ◽  
Vol 5 (1) ◽  
Author(s):  
Jaspreet Kaur
Keyword(s):  
Regression Analysis ◽  
Banking Sector ◽  
Human Resources Management ◽  
Training And Development ◽  
Linear Forms ◽  
Knowledge And Skills ◽  
Resources Management ◽  
Level Of Satisfaction ◽  
Log Linear ◽  
The Impact

Manpower training and development is an important aspect of human resources management which must be embarked upon either proactively or reactively to meet any change brought about in the course of time. Training is a continuous and perennial activity. It provides employees with the knowledge and skills to perform more effectively. The study examines the opinions of trainees regarding the impact of training and development programmes on the productivity of employees in the selected banks. To evaluate the impact of training and development programmes on productivity of banking sector, multiple regression analysis was employed in both log as well as log-linear forms. Also the impact of three sets of training i.e. objectives, methods and basics on level of satisfaction of respondents with the training was also examined through employing the regression analysis in the similar manner.

scholarly journals Willingness to Pay for Improved Operations and Maintenance Services of Gravity-Fed Water Schemes in Idjwi Island (Democratic Republic of the Congo)

Water ◽  
2021 ◽  
Vol 13 (8) ◽  
pp. 1050
Author(s):  
Ruben Jimenez-Redal ◽  
Germán Arana-Landín ◽  
Beñat Landeta ◽  
Jaime Larumbe
Keyword(s):  
Willingness To Pay ◽  
Democratic Republic ◽  
Economic Value ◽  
Water Systems ◽  
Conditioning Factors ◽  
Rural Water ◽  
Operations And Maintenance ◽  
Republic Of The Congo ◽  
Log Linear ◽  
Rural Water Systems

Developing understanding of the economic value that communities ascribe to improved operations and maintenance (O&M) services has emerged as a key factor in achieving financial sustainability for rural water systems. The present study elicits household willingness to pay (WTP) for improved O&M services in eight gravity-fed water schemes in Idjwi Island (Democratic Republic of the Congo, DRC). A contingent valuation survey was implemented through an open-ended format questionnaire to 1105 heads of household and a log-linear regression model was employed to assess the factors influencing higher values. Findings show an average willingness to pay of 327 Congolese Francs (CDF) per month and 36 CDF per bucket. Results also indicate a significant WTP differential among studied schemes. The analysis of the conditioning factors reveals that the level of excludability, the participation in management meetings and the time employed in fetching water from an improved source are contingent with their WTP. The findings of this study are important for development agents trying to establish acceptable, affordable and practicable tariffs that help finance reliable rural water systems in Idjwi.

scholarly journals Carbonate-silicate cycle predictions of Earth-like planetary climates and testing the habitable zone concept

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Owen R. Lehmer ◽  
David C. Catling ◽  
Joshua Krissansen-Totton
Keyword(s):  
Liquid Water ◽  
Physicochemical Parameters ◽  
Silicate Weathering ◽  
Habitable Zone ◽  
Two Dimensional ◽  
Land Area ◽  
Incident Flux ◽  
Earth Like Planets ◽  
Surface Liquid ◽  
Log Linear

AbstractIn the conventional habitable zone (HZ) concept, a CO2-H2O greenhouse maintains surface liquid water. Through the water-mediated carbonate-silicate weathering cycle, atmospheric CO2 partial pressure (pCO2) responds to changes in surface temperature, stabilizing the climate over geologic timescales. We show that this weathering feedback ought to produce a log-linear relationship between pCO2 and incident flux on Earth-like planets in the HZ. However, this trend has scatter because geophysical and physicochemical parameters can vary, such as land area for weathering and CO2 outgassing fluxes. Using a coupled climate and carbonate-silicate weathering model, we quantify the likely scatter in pCO2 with orbital distance throughout the HZ. From this dispersion, we predict a two-dimensional relationship between incident flux and pCO2 in the HZ and show that it could be detected from at least 83 (2σ) Earth-like exoplanet observations. If fewer Earth-like exoplanets are observed, testing the HZ hypothesis from this relationship could be difficult.

Sign in / Sign up

Export Citation Format

Share Document