BUG: Incorrect TSA index if loc resolves to slice

Author: ChadFulton

statsmodels/tsa/base/tsa_model.py

@@ -377,7 +377,7 @@ def _get_index_loc(self, key, base_index=None):
 
         # Return the index through the end of the loc / slice
         if isinstance(loc, slice):
-            end = loc.stop
+            end = loc.stop - 1
         else:
             end = loc