This package is no longer in use since the Swedish Hip Arthroplasty Register is now a part of the Swedish Arthroplasty Register (SAR).
Relevant functions from the package have been migrated to a new {slrplotfun} package currently (2022-10-19) available at https://gitlab.com/registercentrum/statistikenheten/slrplotfun (a package which might be further refactored into the new package {rcplot}).
Source code is, however, still available in the archived version!