| UPSvarApprox-package | UPSvarApprox: Approximate the variance of the Horvitz-Thompson estimator |
| approx_var_est | Approximated Variance Estimators |
| UPSvarApprox | UPSvarApprox: Approximate the variance of the Horvitz-Thompson estimator |
| Var_approx | Approximate the Variance of the Horvitz-Thompson estimator |