cvcov                   Clustered variance-covariance matrices and T
                        statistic d.o.f.
marg                    Estimating predictive margins on a model
marg.glm                Predicted Margins for 'glm' objects
marg.ivreg              Predicted Margins for 'ivreg' objects from the
                        'AER' package
margex                  Artificial data for margins
pred_se                 Main wrapper function to calculate margins and
                        standard errors
