Is there a package that provides equivalents of MASS package, especially non-parametric and semi-parametric methods for complex survey and longitudinal data? Is there a book that someone recommend that covers these topics with R (or Stata) examples? My web-searches have not resulted in much except that these seem to be actively researched topics by some statisticans working on theory --- no packages mentions of software were found in the few (I recall only one) empirical examples found.
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