correlation              Correlation between Predictions from Equation i
                         and j
correlation.resids	 Correlation matrix of the residuals
hausman                  Hausman's Test
kmenta                   Partly Artificial Data on the U. S. Economy
ols                      Ordinary Least Squares Estimation
se.ratio                 Ratio of the Standard Errors
summary                  Summary
summary.system           Summary
sur                      Seemingly Unrelated Regressions Estimation
threestage               Three-Stage Least Squares Estimation
threestage.cov           Variance-Covariance Matrix
twostage                 Two-Stage Least Squares Estimation
varcov                   Variance-Covariance
