Nonparametric and semiparametric models The concept of nonparametric smoothing is a central idea in statistics that aims to simultaneously estimate and modes the underlyingstructure. The book considers high dimensional objects as density functions and regression. The semiparametric modeling technique compromises the two aims flexibility and simplicity of statistical procedures by introducing partial parametric components. These components allow to match structural conditions like e.g. linearity in some variables and may be used to model the influence of discrete variables. The aim of this monograph is to present the statistical and mathematical principles of smoothing with a focus on applicable techniques. The necessary mathematical treatment is easily understandable and a wide variety of interactive smoothing examples are given. The book does naturally split into two parts: Nonparametric models (histogram kernel density estimation nonparametric regression) and semiparametric models (generalized regression single index models generalized partial linear models additive and generalized additive models). The first part is intended for undergraduate students majoring in mathematics statistics econometrics or biometrics whereas the second part is intended to be used by master and PhD students or researchers. The material is easy to accomplish since the e book character of the text gives a maximum of flexibility in learning (and teaching) intensity. TOC: Introduction. Nonparametric Models. Semiparametric Models.