obs_rng.stan

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array[] int obs_rng(vector log_exp_obs, array[] real phi, int model_obs) {
  int n = num_elements(log_exp_obs);
  array[n] int pp;
  if (model_obs) {
    pp = neg_binomial_2_log_rng(log_exp_obs, phi[1]);
  }else{
    pp = poisson_log_rng(log_exp_obs);
  }
  return(pp);
}