Mannheim, Univ., Diss., 2001.

The use of minimum tillage technology reduces the quantity of tillage required to produce a crop, thereby reducing soil degradation. The reduced tillage results in increased soil organic matter and a reduction in soil and water erosion. Producers, researchers, and farm implement manufacturers have reduced land degradation through innovative farming practices and equipment. An example is the innovation of minimum tillage equipment and farming practices which is designed to reduce damage caused by increased tilling of the land. Minimum tillage maintains more of the previous crops residue on the surface of the soil, thereby reducing the damaging effects of wind and water erosion. Some Prairie producers have chosen to adopt minimum tillage technology, while others continue to use conventional tillage. The objective of this thesis is to determine which socio-economic, farm, and regional characteristics are influential in determining whether minimum tillage technology and practices are adopted. <p>The theoretical framework for this thesis is based on an agriculture producers objective function. A lexicographic utility function is used, which means that each element of the utility function must be satisfied in order of rank with the highest level of utility achieved when the greatest number of elements has been satisfied. For the empirical analysis a Probit model is used to model the decision of whether to adopt minimum tillage technology. A number of socio-economic, farm, and regional characteristics, such as age, education, farm size, soil type, weather, and location of a research farm, were included as explanatory variables. The primary data source for the empirical analysis was farm level data from the Agriculture and Population Census data from 1991, 1996, and 2001, which resulted in over 42,000 observations in the data set. <p>A number of model specifications and sensitivity analyses were run and the results obtained were consistent with one another, thus the findings presented in this thesis are robust. A number of socio-economic, farm, and regional characteristics are significant in determining whether minimum tillage is adopted. These variables include: Alberta dummy variable, summerfallow, age, total farm area, gross farm sales, black, brown, and dark gray soils, corporate operating structure, time, average maximum April and June temperature, and total June precipitation.

The use of minimum tillage technology reduces the quantity of tillage required to produce a crop, thereby reducing soil degradation. The reduced tillage results in increased soil organic matter and a reduction in soil and water erosion. Producers, researchers, and farm implement manufacturers have reduced land degradation through innovative farming practices and equipment. An example is the innovation of minimum tillage equipment and farming practices which is designed to reduce damage caused by increased tilling of the land. Minimum tillage maintains more of the previous crops residue on the surface of the soil, thereby reducing the damaging effects of wind and water erosion. Some Prairie producers have chosen to adopt minimum tillage technology, while others continue to use conventional tillage. The objective of this thesis is to determine which socio-economic, farm, and regional characteristics are influential in determining whether minimum tillage technology and practices are adopted. <p>The theoretical framework for this thesis is based on an agriculture producers objective function. A lexicographic utility function is used, which means that each element of the utility function must be satisfied in order of rank with the highest level of utility achieved when the greatest number of elements has been satisfied. For the empirical analysis a Probit model is used to model the decision of whether to adopt minimum tillage technology. A number of socio-economic, farm, and regional characteristics, such as age, education, farm size, soil type, weather, and location of a research farm, were included as explanatory variables. The primary data source for the empirical analysis was farm level data from the Agriculture and Population Census data from 1991, 1996, and 2001, which resulted in over 42,000 observations in the data set. <p>A number of model specifications and sensitivity analyses were run and the results obtained were consistent with one another, thus the findings presented in this thesis are robust. A number of socio-economic, farm, and regional characteristics are significant in determining whether minimum tillage is adopted. These variables include: Alberta dummy variable, summerfallow, age, total farm area, gross farm sales, black, brown, and dark gray soils, corporate operating structure, time, average maximum April and June temperature, and total June precipitation.

Bayreuth, Univ., Dipl.-Arb., 2009.

OLIVEIRA, Alexandre N. de. Independência financeira e a emancipação de distritos no Estado do Ceará. 2014. 46f. Dissertação (mestrado) - Universidade Federal do Ceará, Programa de Pós Graduação em Economia, CAEN, Fortaleza-CE, 2014. / Submitted by Mônica Correia Aquino (monicacorreiaaquino@gmail.com) on 2016-02-01T20:48:33Z No. of bitstreams: 1 2014_dissert_anoliveira.pdf: 320102 bytes, checksum: ae66ebd03569c93d8630b4dc6e9b85d0 (MD5) / Approved for entry into archive by Mônica Correia Aquino(monicacorreiaaquino@gmail.com) on 2016-02-01T20:48:51Z (GMT) No. of bitstreams: 1 2014_dissert_anoliveira.pdf: 320102 bytes, checksum: ae66ebd03569c93d8630b4dc6e9b85d0 (MD5) / Made available in DSpace on 2016-02-01T20:48:51Z (GMT). No. of bitstreams: 1 2014_dissert_anoliveira.pdf: 320102 bytes, checksum: ae66ebd03569c93d8630b4dc6e9b85d0 (MD5) Previous issue date: 2014 / The present work search investigate the chance of financial involution among the Cearenses' municipalities, from accounting data for 150 localities in periods of 2004, 2008 and 2012. The sample comprises 82% of the total number of municipalities in the state of Ceará and the method used follows a binary dependent variable model, with Probit's hypothesis. The econometric model proposed considered variables of financial autonomy,dependence on transfers, personnel expenses and charges, education expenses and health expenses. The estimates leads us to conclude that the chance is significant in that a new municipality that will be created has fundraising less than the average, being considered a economic-financial scenario unfavorable the process of emancipation of districts in the state of Ceará, there is a view that the Cearenses' municipalities are considered to be poor and highly dependent on features of transfers. / O presente trabalho busca investigar a chance de involução financeira dentre os municípios cearenses, a partir dos dados contábeis de 150 localidades nos períodos de 2004, 2008 e 2012. A amostra utilizada compreende 82% do total de municípios no estado do Ceará e o método utilizado segue um modelo de variável dependente binária, com hipótese Probit. O modelo econométrico proposto considerou variáveis de autonomia financeira, dependência de transferências, despesas com pessoal e encargos, gastos com educação e gastos com saúde. As estimativas permitem constatar que a chance é significativa de que um novo município que venha a ser criado possua arrecadação inferior à média, sendo considerado um cenário econômico-financeiro desfavorável ao processo de emancipação de distritos no estado do Ceará, haja vista que os municípios cearenses são considerados pobres e altamente dependentes de recursos de transferências.

O consumo domiciliar de microcomputadores cresceu de forma acelerado nos últimos anos. Apesar de grupos com determinadas características socioeconômicas terem um consumo maior de computadores, o consumo vem aumentando em todos os grupos. Ou seja, mesmo com diferenças grandes, o consumo de computadores não é mais uma exclusividade dos mais ricos, dos mais bem instruídos ou de determinadas regiões do país. Os modelos Probit e double-hurdle se mostraram adequados para analisar o consumo de computadores no Brasil. O modelo Probit ajustou bem os dados na análise da presença de um computador no domicílio. Já para a despesa com computador, o modelo double-hurdle se mostrou melhor que o modelo Tobit, uma vez que este separa a análise do processo de decisão de compra em dois, separando a decisão de gastar da decisão de quanto gastar. / Household consumption of microcomputers grew up fast in recent years. Despite some socioeconomic groups take highercomputer consumption, consumption is increasing in all groups. In other words, even with large differences, the consumption of computers is no longer uniqueness of wealthier, better educated or at certain regions of the country. Probit and double-hurdle models were suitable for analyzing the consume of computers in Brazil. The Probit model adjusted well the data set in the analysis of the presence of a computer at home. For the computer spending the double-hurdle model proved better than Tobit because separates the analysis of the purchase decision process in two, separating the decision to spend from the decision of how much spend.

O consumo domiciliar de microcomputadores cresceu de forma acelerado nos últimos anos. Apesar de grupos com determinadas características socioeconômicas terem um consumo maior de computadores, o consumo vem aumentando em todos os grupos. Ou seja, mesmo com diferenças grandes, o consumo de computadores não é mais uma exclusividade dos mais ricos, dos mais bem instruídos ou de determinadas regiões do país. Os modelos Probit e double-hurdle se mostraram adequados para analisar o consumo de computadores no Brasil. O modelo Probit ajustou bem os dados na análise da presença de um computador no domicílio. Já para a despesa com computador, o modelo double-hurdle se mostrou melhor que o modelo Tobit, uma vez que este separa a análise do processo de decisão de compra em dois, separando a decisão de gastar da decisão de quanto gastar. / Household consumption of microcomputers grew up fast in recent years. Despite some socioeconomic groups take highercomputer consumption, consumption is increasing in all groups. In other words, even with large differences, the consumption of computers is no longer uniqueness of wealthier, better educated or at certain regions of the country. Probit and double-hurdle models were suitable for analyzing the consume of computers in Brazil. The Probit model adjusted well the data set in the analysis of the presence of a computer at home. For the computer spending the double-hurdle model proved better than Tobit because separates the analysis of the purchase decision process in two, separating the decision to spend from the decision of how much spend.

The diploma thesis deals with a theoretical description and practical use of probit analysis, which is a part of survival analysis. The thesis shows different probit models, their differences and appropriateness on analised data. The used data belong to the molecular diagnostic area and are provided by Genex CZ company. The result is an analysis of probit analysis output data from Minitab 14 software. The thesis was supported by project from MSMT of the Czech Republic no. 1M06047 Center for Quality and Reliability of Production.

Ve své diplomové práci se zabývám modely diskrétní binární volby. Zkoumám je nejprve z teoretického hlediska, jaká je jejich podstata, jaká jsou jejich specifika a problémy. Postupně rozebírám jednotlivé modely diskrétní binární volby a to lineární pravděpodobnostní model, logitový model a probitový model. Zabývám se jejich odhadem, testováním významnosti jednotlivých koeficientů a shodou modelů s daty. V praktické části se zaměřuji na problematiku životního prostředí a třídění odpadu. Aplikuji jednotlivé modely na získaná data a snažím se vysvětlit, na čem závisí volba jedince mezi ?třídím odpad? a nebo ?netřídím odpad?. Na základě analýzy poté doporučuji, na koho a jakým způsobem zacílit osvětu.

REIS, Felipe Alves. Análise do potencial produtivo da mamona no estado do Ceará. 2009. 86 f.: Dissertação (mestrado em Economia Rural) - Universidade Federal do Ceará, Centro de Ciências Agrárias, Fortaleza-CE, 2009 / Submitted by Kepler Barroso (keplercavalcante@hotmail.com) on 2013-11-07T18:31:37Z No. of bitstreams: 1 2009_dis_fareis.pdf: 435987 bytes, checksum: 5ab161b308246813fe86978fe551cf97 (MD5) / Approved for entry into archive by Margareth Mesquita(margaret@ufc.br) on 2013-12-03T18:52:45Z (GMT) No. of bitstreams: 1 2009_dis_fareis.pdf: 435987 bytes, checksum: 5ab161b308246813fe86978fe551cf97 (MD5) / Made available in DSpace on 2013-12-03T18:52:45Z (GMT). No. of bitstreams: 1 2009_dis_fareis.pdf: 435987 bytes, checksum: 5ab161b308246813fe86978fe551cf97 (MD5) Previous issue date: 2009 / The general objective of this work is to analyze the productive potential of the castor oil in the state of Ceará from a technical, social and economic approach. To obtaining the results, the research followed the following steps: initially, a study took place to tabulate and describe primary data collected through the application of 118 questionnaires to the growers and 120 to the not growers of the castor oil plant in the districts of Boa Viagem, Canindé, Itatira, Pedra Branca, Quixadá, Quixeramobim, Quiterianópolis and Tauá. Secondly, a binary probit regression was made to verify wheter the farmer is a castor oil plant grower or not. Thirdly, a multiple lineal regression of the equation of castor oil plant offer inthe state of Ceará was made concerning the period from 1980 to 2007 and this was possible due the secondary data collected in IBGE and IPECE. The analysis of the data allowed to identify the profile of the growers of castor oil plant and of the techniques used in the production. Thus, one can conclude that the farmer's propensity to plant castor oil plant is being influenced by the area, agricultural income, family total income, financing, participation in association and in the credibility of the program. Finnaly, it was verified that the castor oil plant offer is strongly related with the planted area and with its own price, being necessary investiments in technologies and fairer prices. / Este trabalho tem como objetivo geral analisar o potencial produtivo da mamona no estado do Ceará, a partir de uma abordagem técnica e socioeconômica. Para a obtenção dos resultados, a pesquisa seguiu as seguintes etapas: inicialmente realizou-se um estudo tabular e descritivo de dados primários coletados através da aplicação de 118 questionários aos produtores e 120, aos não produtores de mamona dos municípios de Boa Viagem, Canindé, Itatira, Pedra Branca, Quixadá, Quixeramobim, Quiterianópolis e Tauá. Na segunda parte do estudo foi realizada uma regressão binária probit sobre a chance de o agricultor plantar mamona e, por último, realizou-se uma regressão linear múltipla da equação de oferta de mamona no estado do Ceará, no período de 1980 a 2007, usando dados secundários coletados no Instituto Brasileiro de Geografia e Estatística e Instituto de Pesquisa e Estratégia Econômica do Ceará. A análise dos dados permitiu identificar o perfil dos produtores de mamona e as técnicas usadas na produção. Conclui-se, então, que a propensão do agricultor a plantar mamona está sendo influenciada pela área, a renda agrícola, renda total, o financiamento, a participação em associação e a credibilidade do programa. Por fim, identificou-se que a oferta da mamona está fortemente relacionada com a área plantada e com o seu próprio preço, o que aponta para a necessidade de investimentos em tecnologias e preços mais justos.