Published

2017-01-16

Bimodal Regression Model

Modelo de regresión Bimodal

Keywords:

Bimodal distribution, Generalized Gaussian distribution, Linear regression, Power normal model, Regression (en)
distribución bimodal, distribución gaussiana generalizada, regresión lineal, modelo de regresión exponenciado. (es)

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Authors

  • Guillermo Domingo Martinez Universidad de Cordoba
  • Heleno Bolfarine Universidade de Sao Paulo
  • Hugo Salinas Universidad de Atacama
Regression analysis is a technique widely used in different areas ofhuman knowledge, with distinct distributions for the error term. Itis the case, however, that regression models with bimodal responsesor, equivalently, with the error term following a bimodal distribution are notcommon in the literature, perhaps due to the lack of simple to dealwith bimodal error distributions. In this paper we propose a simpleto deal with bimodal regression model with a symmetric-asymmetricdistribution for the error term for which for some values of theshape parameter it can be bimodal. This new distribution containsthe normal and skew-normal as special cases. A realdata application reveals that the new model can be extremely usefulin such situations.

El análisis de regresión es una técnica muy utilizada en diferentes áreas de conocimiento humano, con diferentes distribuciones para el término de error, sin embargo los modelos de regresión con el termino de error siguiendo una distribución bimodal no son comunes en la literatura, tal vez por la simple razón de no tratar con errores con distribución bimodal. En este trabajo proponemos un camino sencillo para hacer frente a modelos de regresión bimodal con una distribución simétrica - asimétrica para el término de error para la cual para algunos valores del parámetro de forma esta puede ser bimodal. Esta nueva distribución contiene a la distribución normal y la distribución normal asimétrica como casos especiales. Una aplicación con datos reales muestra que el nuevo modelo puede ser extremadamente útil en algunas situaciones.

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References

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