diff --git a/numpyro_sts/base.py b/numpyro_sts/base.py
index b8bfa34..e22f5a0 100644
--- a/numpyro_sts/base.py
+++ b/numpyro_sts/base.py
@@ -244,18 +244,15 @@ def union(self, other: "LinearTimeseries") -> "LinearTimeseries":
 
         return model
 
-    def sample_deterministic(self, sample_shape=()) -> jnp.ndarray:
+    def deterministic(self) -> "LinearTimeseries":
         """
-        Utility function for "sampling" the deterministic part of the series.
-
-        Args:
-            sample_shape: See :meth:`sample`.
+        Constructs a deterministic version of the timeseries.
 
         Returns:
-            Returns samples.
+            A :class:`LinearTimeseries` with column mask set to False.
         """
 
-        copy = LinearTimeseries(
+        return LinearTimeseries(
             self.n,
             self.offset,
             self.matrix,
@@ -264,4 +261,15 @@ def sample_deterministic(self, sample_shape=()) -> jnp.ndarray:
             column_mask=np.zeros_like(self.column_mask),
         )
 
-        return copy.sample(PRNGKey(0), sample_shape)
+    def sample_deterministic(self, sample_shape=()) -> jnp.ndarray:
+        """
+        Utility function for "sampling" the deterministic part of the series.
+
+        Args:
+            sample_shape: See :meth:`sample`.
+
+        Returns:
+            Returns samples.
+        """
+
+        return self.deterministic().sample(PRNGKey(0), sample_shape)