Multivariate regressions

• eq2xcol — Transformation of a system of equations into a matrix vector
• eqlist — recovers objects names in an equation
• exploeqs — Transformation of 2sls or 3sls equations
• explosys — Transformation of sur equations
• sur — Zellner Seemingly Unrelated Regression
• surmod — Zellner Seemingly Unrelated Regression for equations of a model
• syslist — recovers objects names in a system of equations
• threesls — Three-Stage Least-squares Regression
• twosls — Two-Stage Least-squares Regression