correct obsmon statistics

pysurfex/obsmon.py

@@ -195,7 +195,7 @@ def rmse(predictions, targets):
 
     """
     if len(predictions) > 0:
-        return np.sqrt(np.nanmin(((predictions - targets) ** 2)))
+        return np.sqrt(np.nanmean(((predictions - targets) ** 2)))
     else:
         return "NULL"
 
@@ -303,7 +303,7 @@ def calculate_statistics(observations, modes, stat_cols):
             if col == "nobs":
                 statistics.update({tab: len(obs)})
             elif col == "fg_bias":
-                statistics.update({tab: bias(fg_dep)})
+                statistics.update({tab: mean(fg_dep)})
             elif col == "fg_abs_bias":
                 statistics.update({tab: absbias(fg_dep)})
             elif col == "fg_rms":
@@ -315,7 +315,7 @@ def calculate_statistics(observations, modes, stat_cols):
             elif col == "bc":
                 statistics.update({tab: 0})
             elif col == "an_bias":
-                statistics.update({tab: bias(an_dep)})
+                statistics.update({tab: mean(an_dep)})
             elif col == "an_abs_bias":
                 statistics.update({tab: absbias(an_dep)})
             elif col == "an_rms":