The idea of generalized linear models (GLM) generated by Nelder and Wedderburn (1972) seeks to extend the domain of applicability of the linear model by relaxing the normality assumption. In particular, GLM can be used to model the relationship between the explanatory variable, X, and a function of the mean, μ i , of a continuous or discrete responses. More precisely, GLM assumes that g(μ i ) = η i =\({\sum\limits}_{j=1}^p x_ij \beta_j,\) where β = (β 1, β 2, …, β p )T is the p-vector of unknown parameters and g( ⋅) is the link function that determines the scale on which linearity is assumed. Models of this type include logistic and probit regression, Poisson regression, linear regression with known variance, and certain models for lifetime data.
Specifically, let Y 1, Y 2, …, Y n , be n independent random variables drawn from the exponential family with density (or probability function)
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Hamzah, A., Nasser, M. (2011). Robust Regression Estimation in Generalized Linear Models. In: Lovric, M. (eds) International Encyclopedia of Statistical Science. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-04898-2_495
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