Sample Selection Bias
Mostrando 13-24 de 38 artigos, teses e dissertações.
-
13. Impactos da restrição ao crédito rural nos estabelecimentos agropecuários brasileiros / The impact of rural credit restriction to brazilian farmers
The rural credit was implemented in the late 1960s and thenceforth it became one of the major agricultural policies in Brazil. From its inception, the program relied on government subsidies obtained through interest rates, offsetting in part the resources shift from the agricultural sector promoted by the import substitution process. The credit policy direct
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 15/12/2010
-
14. Modelo de mistura padrão com tempos de vida exponenciais ponderados
In this work, we brie_y introduce the concepts of long-term survival analysis. We dedicated ourselves exclusively to the standard mixture cure model from Boag (1949) and Berkson &Gage (1952), showing its deduction and presenting the imunes probability function, which is taken from the model itself and we investigated the identi_ability issues of the mixture
Publicado em: 2010
-
15. Razão de sacrifício em países emergentes e em desenvolvimento
The sacrifice ratio is calculated with the purpose of estimating a model through Ordinary Least Squares (OLS), in which both sample selection and high income economies are controlled, in order to test whether sacrifice ratios of emerging and depeloping economies is affected by velocity of desinflation, by the fact of a country being an inflation targeter and
Publicado em: 2009
-
16. Respostas de observação na tarefa de pareamento ao modelo: analisando topografias de controle de estímulos e seus efeitos sobre a formação de equivalência / Observing responses on the MTS task: Stimuli control topography analysis and their equivalence relations effects
Understanding that the study of stimulus control topographies (SCTs) may be benefited on a conditional discrimination procedure to investigate the complex control of stimuli, specially in the classes formation of equivalent stimuli, this study investigates this issue directly, through a software that executes the matching-to-sample task (MTS) in a modified w
Publicado em: 2009
-
17. Gestão educacional e a qualidade do aprendizado: uma análise com dados do PISA 2006 / Educational management and the quality of learning: analyzing PISA 2006 Database
This thesis aims to elaborate a function of educational production for 15 aged students evaluated by PISA 2006, using their grades on Science test. The selected sample is composed by students from the following countries: Argentina, Brazil, Chile, Colombia, Spain, USA, Finland, Mexico, Portugal and Uruguay. Some countries from Latin America were selected due
Publicado em: 2009
-
18. Effects of pluriactivity and non-farming income on poverty and inequality in the Brazilian Northeast / Efeitos da pluriatividade e rendas não-agrícolas sobre a pobreza e desigualdade rural na região Nordeste
Many rural family households in the Brazilian Northeast have at least a member involved in non-farming activities. However, this region also concentrates the highest percentage of poor families. Poverty is reflected by social indicators such as higher infant mortality rate between the Brazilian regions, lower life expectancy at birth and higher illiteracy ra
Publicado em: 2008
-
19. Bases atencionais do raciocÃnio emocional infantil em contextos sociais
Studies about emotional reasoning and parent-based reasoning had found that the emotional reply to fear in children evaluated through experimental task of script danger assessment happens as in relation to danger information, as safety information contained in them. Nevertheless, the attentional bias (psychopatological process which implies in selection of d
Publicado em: 2007
-
20. Filtros de spin não-magneticos controlados por voltagem / Voltage controlled non-magnetic spin filters
The aim of this work was to study the transport properties of nonmagnetic semiconductor heterostructures: double barrier diodes ? DBD. Our attention was focused on the carrier spin polarization through the structure. First we present the phenomenology behind the carrier transport and how the DBD can act as a spin filter. In the sequence, we present the exper
Publicado em: 2006
-
21. Sintomas musculo-esqueleticos relacionados ao trabalho em cirurgiões-dentistas
The purpose ofthe present research was to contribute for the knowledge ofmusculoskeletal disorders in Brazilian dentists, represented by a sample. That s why; we intended to identify the prevalence of musculoskeletal symptoms to the dentist work, as well as bis corporallocation, quality oflife aspects and odontological tasks perceived as stressfull. 165 dent
Publicado em: 2003
-
22. Birth outcomes and the effectiveness of prenatal care.
OBJECTIVE: To investigate pregnant women's self-selection effects on the estimation of birthweight production function. A particular emphasis is placed on assessing the effectiveness of prenatal care as a major medical input in the birthweight production function. DATA SOURCES: Primary data compiled from birth and abortion certificates for the Commonwealth o
-
23. Quality and provider choice: a multinomial logit-least-squares model with selectivity.
A Federal Trade Commission survey of contact lens wearers is used to estimate a multinomial logit-least-squares model of the joint determination of provider choice and quality of care in the contact lens industry. The effect of personal and industry characteristics on a consumer's choice among three types of providers--opticians, ophthalmologists, and optome
-
24. Segregation and sporadic cases in families with Hunter's syndrome.
Segregation analysis on five samples of families with Hunter's syndrome (158 cases overall) shows that the mutant allele segregates in agreement with Mendelian expectations for an X linked recessive disease, but the proportion of sporadic cases is significantly lower than expected under mutation-selection equilibrium. Heterogeneity among the samples is appar