add suport for complex survey data

[lucasmation]

The traditional package is survey, explained here : http://r-survey.r-forge.r-project.org/survey/index.html

Other options listed here: http://www.hcp.med.harvard.edu/statistics/survey-soft/

In particular sqlsurvey : http://sqlsurvey.r-forge.r-project.org/ http://r-forge.r-project.org/projects/sqlsurvey/ https://www.r-project.org/conferences/useR-2007/program/presentations/lumley.pdf

Everything a bit old, last developments from these packages were in 2012...

[enoches]

This one may be useful too: svrvyr — a package for 'dplyr'-Like Syntax for Summary Statistics of Survey Data