we only add a new value to the running stat if the value is between t…

…he lower and upper bounds

src/cehrbert/utils/stat_utils.py

@@ -6,13 +6,16 @@
 class RunningStatistics(OnlineStatistics):
     def __init__(self, capacity=100, value_outlier_std=2.0):
         super().__init__()
+        self.value_outlier_std = value_outlier_std
         self.excluding_outlier_online_statistics = ExcludingOutlierOnlineStatistics(
             capacity=capacity, value_outlier_std=value_outlier_std
         )
 
     def add(self, weight: float, value: float) -> None:
         if self.excluding_outlier_online_statistics.is_full():
-            super().add(weight, value)
+            std = self.standard_deviation()
+            if self.current_mean - self.value_outlier_std * std <= self.current_mean + self.value_outlier_std * std:
+                super().add(weight, value)
         else:
             self.excluding_outlier_online_statistics.add(value)
             if self.excluding_outlier_online_statistics.is_full():