Bug fix

Author: Noah Stoffman

pandas_datareader/yahoo/daily.py

@@ -134,7 +134,7 @@ def _read_one_data(self, url, params):
                  'volume', 'adjclose']]
 
         if self.ret_index:
-            df['Ret_Index'] = _calc_return_index(df['Adj Close'])
+            df['Ret_Index'] = _calc_return_index(df['adjclose'])
         if self.adjust_price:
             df = _adjust_prices(df)
         return df.sort_index().dropna(how='all')