This R package contains functions for fitting simultaneous systems of linear
and nonlinear equations using Ordinary Least Squares (OLS), Weighted Least
Squares (WLS), Seemingly Unrelated Regressions (SUR), Two-Stage Least Squares
(2SLS), Weighted Two-Stage Least Squares (W2SLS), Three-Stage Least Squares
(3SLS), and Weighted Three-Stage Least Squares (W3SLS).
