Extended Linear Modeling with Splines by Jianhua Z.\ Huang and Charles J. Stone Abstract: Extended linear models form a very general framework for statistical modeling. Many practically important contexts fit into this framework, including regression, logistic and Poisson regression, density estimation, spectral density estimation, and conditional density estimation. Moreover, hazard regression, proportional hazard regression, marked point process regression, and diffusion processes, all perhaps with time-dependent covariates, also fit into this framework. Polynomial splines and their tensor products provide a universal tool for constructing maximum likelihood estimates for extended linear models. The theory of rates of convergence for such estimates as it applies both to fixed knot splines and to free knot splines will be surveyed, and the implications of this theory for the development of corresponding methodology will be discussed briefly.