Map AR1 correlation parameter for recruitment deviations
Source:R/setup_recruitment.R
do_RecDevs_rho_mapping.RdConstructs the RecDevs_rho factor map. RecDevs_rho is only
read when RecDevs_model = "ar1" (see Setup_Mod_Rec);
under any other RecDevs_model every RecDevs_rho parameter is
mapped to NA regardless of RecDevs_rho_spec, since the
recruitment penalty never reads it.