https://github.com/stan-dev/example-models/blob/f73317a150d0a28f0f47265228c21ee7a3ce8a7a/BPA/Ch.13/13.3.2_Covariates.R#L19C1-L19C1 'occ_fs' is not in the stan model file, adding 'occ_obs' also gives an error. Thank you!
