svrep 0.6.1

• Added support for Fay's generalized replication method, specifically the version proposed in Fay (1989): the key functions are as_fays_gen_rep_design() and make_fays_gen_rep_factors(), which are nearly identical to the generalized bootstrap functions as_gen_boot_design() and make_gen_boot_factors().

• Added a new variance estimator, "Deville-Tille", useful for balanced sampling (including the cube method). Currently only works for single-stage designs.

  • The functions as_gen_boot_design() and as_fays_gen_rep_design() have a new argument aux_var_names meant to be used for the "Deville-Tille" variance estimator. Similarly, make_gen_boot_factors() and make_fays_gen_rep_factors() have an argument named aux_vars.