| vcov-package | Variance-Covariance Matrices and Standard Errors | 
| se | Fast Covariance Matrix and Standard Error Computation | 
| test.vcov | Runs a set of tests. | 
| Vcov | Fast Covariance Matrix and Standard Error Computation | 
| Vcov.glm | Fast Covariance Matrix and Standard Error Computation | 
| Vcov.lm | Fast Covariance Matrix and Standard Error Computation |