diff --git a/visualize/visualize.py b/visualize/visualize.py
new file mode 100644
index 0000000..5c11e14
--- /dev/null
+++ b/visualize/visualize.py
@@ -0,0 +1,24 @@
+#-*- coding: utf-8 -*-
+"""
+visualize.py
+"""
+
+import typing
+
+import matplotlib.pyplot as plt
+
+def visualize_data_distribution(data: DataFrame) -> None:
+    for category in ["treatment", "target"]:
+        select = data.select(category) \
+                .groupby(category) \
+                .count()
+        plt.barh(
+            np.array(select.select(category).collect()).squeeze(),
+            np.array(select.select("count").collect()).astype("float") \
+                .squeeze())
+        plt.xlabel("Count")
+        plt.ylabel(category)
+        plt.savefig(f"{category}_counts.png", bbox_inches="tight")
+        plt.close()
+
+# EOF