... calculate a closed form estimate of the asymptotically exact covariance matrix of the linear component of a GAM (the air pollution coefficients). Furthermore, we developed the S package gam.exact, ... “Meta-analysis of time- series studies of air pollution and mortality: effects of gases and particles and the influence of cause of death, age, and season.”J Air Waste Manag Assoc., 52, 470–484. The ... Model.”Journal of the American Statistical Association, 92, 1033–1040.Environmental Protection Agency (1970). The Clean Air Act (CAA); 42 U.S .C. s/s 7401 et seq.(1970) Clean Air Act and Amendments...