correlation              Correlation between Predictions from Equation i
                         and j
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
threestage               Three-Stage Least Squares Estimation
threestage.cov           Variance-Covariance Matrix
twostage                 Two-Stage Least Squares Estimation
varcov                   Variance-Covariance
