Weighted Empirical Processes in Dynamic Nonlinear Models This book presents a unified approach for obtaining the limiting distributions of minimum distance M and R estimators corresponding to non smooth underlying scores in a large class of dynamic non linear models including ARCH models. It also discusses classes of goodness of t tests for fitting an error distribution in some of these models and or fitting a regression autoregressive function without assuming the knowledge of the error distribution. The main tool is the asymptotic equicontinuity of certain basic weighted residual empirical processes in the uniform and L2 metrics. The contents of this monograph should be useful to graduate students and research scholars in statistics econometrics and finance. This book is a an updated edition of the authors monograph Weighted Empirical Processes and Linear Models (IMS Lecture Notes Monograph 21 1992). The new edition differs from the previous one in many ways. To mention just a few: It includes asymptotically distribution free tests for fitting a regression and or an autoregressive models; the asymptotic distributions of auto regression quantiles and rank scores; and above all the weak convergence of the residual empirical processes useful in nonlinear ARCH models. Hira L. Koul is a professor of statistics at Michigan State University. He is a Fellow of the IMS and an Elected Member of the International Statistical Institute. He was awarded the prestigious Humboldt Research Award for Senior Researchers in 1995. He has been on the editorial boards of the Annals of Statistics Sankhya and J. Indian Statistical Association. Currently he is a Coordinating Editor of the Journal of Statistical Planning and Inference and an Associate Editor of Statistics and Probability Letters