cause_list: A list of latent status names (crucial for building templates; see make_template())
FPR_formula: A list of FPR regression formula; check model_options$likelihood$FPR_formula
use_measurements: "BrS", or "SS"
ppd: Default is NULL; set to TRUE for posterior predictive checking
use_jags: Default is FALSE; set to TRUE if want to use JAGS for model fitting.
Returns
A long character string to be inserted into .bug model file as measurement likelihood
See Also
It is used in write_model_Reg_NoNest for constructing a .bug file along with specification of latent status regression (insert_bugfile_chunk_reg_etiology )