Exponential families in theory and practice During the past half century exponential families have attained a position at the center of parametric statistical inference. Theoretical advances have been matched and more than matched in the world of applications where logistic regression by itself has become the go to methodology in medical statistics computer based prediction algorithms and the social sciences. This book is based on a one semester graduate course for first year Ph.D. and advanced masters students. After presenting the basic structure of univariate and multivariate exponential families their application to generalized linear models including logistic and Poisson regression is described in detail emphasizing geometrical ideas computational practice and the analogy with ordinary linear regression. Connections are made with a variety of current statistical methodologies: missing data survival analysis and proportional hazards false discovery rates bootstrapping and empirical Bayes analysis. The book connects exponential family theory with its applications in a way that doesnt require advanced mathematical preparation