The business cycle has long been the focus of empirical economic research. Until recently statistical analysis of macroeconomic fluctuations was dominated by linear time series methods. Over the past 15 years, however, economists have increasingly applied tractable parametric nonlinear time...

Intro to operators, probabilities, and linear model -- Lp-approximable sequences of vectors -- Convergence of linear and quadratic forms -- Regressions with slowly varying regressors -- Spatial models -- Convergence almost everywhere -- Nonlinear models -- Tools for vector autoregressions