128 research outputs found

    Beta Regression in R

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    The class of beta regression models is commonly used by practitioners to model variables that assume values in the standard unit interval (0, 1). It is based on the assumption that the dependent variable is beta-distributed and that its mean is related to a set of regressors through a linear predictor with unknown coefficients and a link function. The model also includes a precision parameter which may be constant or depend on a (potentially different) set of regressors through a link function as well. This approach naturally incorporates features such as heteroskedasticity or skewness which are commonly observed in data taking values in the standard unit interval, such as rates or proportions. This paper describes the betareg package which provides the class of beta regressions in the R system for statistical computing. The underlying theory is briefly outlined, the implementation discussed and illustrated in various replication exercises.Series: Research Report Series / Department of Statistics and Mathematic

    Beta Regression in R

    Get PDF
    The class of beta regression models is commonly used by practitioners to model variables that assume values in the standard unit interval (0, 1). It is based on the assumption that the dependent variable is beta-distributed and that its mean is related to a set of regressors through a linear predictor with unknown coefficients and a link function. The model also includes a precision parameter which may be constant or depend on a (potentially different) set of regressors through a link function as well. This approach naturally incorporates features such as heteroskedasticity or skewness which are commonly observed in data taking values in the standard unit interval, such as rates or proportions. This paper describes the betareg package which provides the class of beta regressions in the R system for statistical computing. The underlying theory is briefly outlined, the implementation discussed and illustrated in various replication exercises.

    HETEROGENEIDADE DO TRABALHO E TAXA DE LUCRO EM MARX

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    The purpose of this paper is to analyze the dynamic behavior of the rate of profit in a marxian framework, once human capital is incorporated as a production factor. In this context, a set of sufficient conditions for an increasing behavior of the rate of profit and the wage rate along the accumulation process is derived.O objetivo do presente artigo é o de analisar o comportamento dinâmico da taxa de lucro em uma estrutura marxista uma vez que o capital humano é incorporado como fator de produção. Neste novo contexto, deriva-se um conjunto de condições suficientes para um comportamento crescente não só da taxa de lucro, mas também da taxa salarial ao longo do processo de acumulação

    Canadian economic growth : random walk or just a walk? / 1992:111

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    Includes bibliographical references (p. 15-17)
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