diff --git a/inst/include/bvhardraw.h b/inst/include/bvhardraw.h
index 32be743d..8fdc289e 100644
--- a/inst/include/bvhardraw.h
+++ b/inst/include/bvhardraw.h
@@ -816,6 +816,29 @@ inline void dl_mn_sparsity(Eigen::VectorXd& group_param, Eigen::VectorXi& grp_ve
   }
 }
 
+inline void dl_mn_sparsity(Eigen::VectorXd& group_param, Eigen::VectorXi& grp_vec, Eigen::VectorXi& grp_id,
+													 double& global_param, Eigen::Ref<Eigen::VectorXd> local_param, Eigen::Ref<Eigen::VectorXd> latent_param,
+													 double& shape, double& rate,
+													 Eigen::Ref<Eigen::VectorXd> coef_vec, boost::random::mt19937& rng) {
+	Eigen::Array<bool, Eigen::Dynamic, 1> group_id;
+  int mn_size = 0;
+  for (int i = 0; i < grp_id.size(); i++) {
+		group_id = grp_vec.array() == grp_id[i];
+		mn_size = group_id.count();
+		Eigen::VectorXd mn_scl(mn_size);
+		for (int j = 0, k = 0; j < coef_vec.size(); ++j) {
+			if (group_id[j]) {
+				mn_scl[k++] = coef_vec[j] * coef_vec[j] / (global_param * global_param * local_param[j] * local_param[j] * latent_param[j]);
+			}
+		}
+		group_param[i] = sqrt(1 / gamma_rand(
+			shape + mn_size / 2,
+			1 / (rate + mn_scl.sum() / 2),
+			rng
+		));
+  }
+}
+
 // Log-density for Dirichlet Hyperparameter in DL
 // 
 // Log density of Dirichlet hyperparameter ignoring constant term
diff --git a/inst/include/bvharmcmc.h b/inst/include/bvharmcmc.h
index 031e0717..5c289978 100644
--- a/inst/include/bvharmcmc.h
+++ b/inst/include/bvharmcmc.h
@@ -739,7 +739,9 @@ class McmcDl : public BaseMcmc {
 	using BaseMcmc::contem_coef;
 	using BaseMcmc::updateCoefRecords;
 	void updateCoefPrec() override {
-		dl_mn_sparsity(group_lev, grp_vec, grp_id, global_lev, local_lev, shape, scl, coef_vec.head(num_alpha), rng);
+		// dl_mn_sparsity(group_lev, grp_vec, grp_id, global_lev, local_lev, shape, scl, coef_vec.head(num_alpha), rng);
+		dl_latent(latent_local, global_lev * local_lev.array() * coef_var.array(), coef_vec.head(num_alpha), rng);
+		dl_mn_sparsity(group_lev, grp_vec, grp_id, global_lev, local_lev, latent_local, shape, scl, coef_vec.head(num_alpha), rng);
 		for (int j = 0; j < num_grp; j++) {
 			coef_var = (grp_vec.array() == grp_id[j]).select(
 				group_lev[j],
@@ -752,7 +754,7 @@ class McmcDl : public BaseMcmc {
 		if (is_group::value) {
 			global_lev = dl_global_sparsity(local_lev.array() * coef_var.array(), dir_concen, coef_vec.head(num_alpha), rng);
 		}
-		dl_latent(latent_local, global_lev * local_lev.array() * coef_var.array(), coef_vec.head(num_alpha), rng);
+		// dl_latent(latent_local, global_lev * local_lev.array() * coef_var.array(), coef_vec.head(num_alpha), rng);
 		prior_alpha_prec.head(num_alpha) = 1 / ((global_lev * local_lev.array() * coef_var.array()).square() * latent_local.array());
 	}
 	void updatePenalty() override {