Algorithm 145: Adaptive numerical integration by Simpson's rule
William Marshall McKeeman · Communications of the ACM · 1962
trireg is a multiple regression procedure which develops and inverts only the upper triangular portion of a correlation matrix of order n.The i,jth (i =< j) matrix element is r(ci+j) where the c's are cram numbers (ref.Algorithm 67, J. Caffey, Comm.ACM 4, July 1961).dep < n dependent variables are regressed simultaneously.Read (u) is an input procedure for single elements.The input consists of nob observations on n variables.The first dep variables are considered dependent and the remaining n -dep are considered independent variables.Independent variables are dropped