defaultcoef - Finds default coefficients names
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
syslist - recovers objects names in a system of equations
threesls - Three-Stage Least-squares Regression
twosls - Two-Stage Least-squares Regression