R: Vignettes and other documentation

# Vignettes and other documentation

## Vignettes from package 'robsurvey'

robsurvey::basic |  | Basic Robust Estimators | HTML | source | R code
robsurvey::greg |  | Robust Generalized Regression (GREG) and Ratio Estimation/ Prediction | HTML | source | R code
robsurvey::regression |  | Robust Survey Regression Estimator | HTML | source | R code
robsurvey::rht |  | Robust Horvitz-Thompson Estimator | HTML | source | R code

## Other files in the doc directory

| Handling_of_NA_and_domains.md |
| doc_comparison.pdf |
| doc_greg.pdf |
| doc_psi_functions.pdf |
| doc_regression_covariance.pdf |