fix categorical

Author: jreback

pandas/core/arrays/categorical.py

@@ -2069,14 +2069,12 @@ def _reverse_indexer(self):
         return result
 
     # reduction ops #
-    def _reduce(self, op, name, axis=0, skipna=True, numeric_only=None,
-                filter_type=None, **kwds):
-        """ perform the reduction type operation """
+    def _reduce(self, name, axis=0, skipna=True, **kwargs):
         func = getattr(self, name, None)
         if func is None:
             msg = 'Categorical cannot perform the operation {op}'
             raise TypeError(msg.format(op=name))
-        return func(numeric_only=numeric_only, **kwds)
+        return func(**kwargs)
 
     def min(self, numeric_only=None, **kwargs):
         """ The minimum value of the object.