diff --git a/run.py b/run.py
index c315e1b..a922d7e 100644
--- a/run.py
+++ b/run.py
@@ -104,13 +104,21 @@ for month in range(12):
 
 z_prev = z.copy()
 
-for month in range(12):
-    model = model_per_month[month]
-    u = entries_of_fully_known_stations[:, known_years:, month].T
-    p = model.predict(u)
-    p[p<0] = 0
-    assert np.all(z[missing_stations, known_years:, month] == -1)
-    z[missing_stations, known_years:, month] = p.T
+METHOD = "mean"
+if METHOD == "linear_regression":
+    for month in range(12):
+        model = model_per_month[month]
+        u = entries_of_fully_known_stations[:, known_years:, month].T
+        p = model.predict(u)
+        p[p < 0] = 0
+        assert np.all(z[missing_stations, known_years:, month] == -1)
+        z[missing_stations, known_years:, month] = p.T
+elif METHOD == "mean":
+    for year in range(known_years, total_years):
+        for month in range(12):
+            assert np.all(z[known_stations, year, month] != -1)
+            assert np.all(z[missing_stations, year, month] == -1)
+            z[missing_stations, year, month] = np.mean(z[known_stations, year, month])
 assert np.all(z != -1)
 df = pd.read_csv('test-A/in.tsv', header=None, sep='\t')
 df.columns = in_columns
diff --git a/test-A/out.tsv b/test-A/out.tsv
index 7cb404a..4bc3a0b 100644
--- a/test-A/out.tsv
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