BUG: fix failing usage of self.assertRaisesRegexp for python 2.6

Author: wesm

pandas/stats/tests/test_ols.py

@@ -693,9 +693,9 @@ def testNonPooled(self):
         self.checkNonPooled(y=self.panel_y, x=self.panel_x,
                             window_type='rolling', window=25, min_periods=10)
     def testUnknownWindowType(self):
-        self.assertRaisesRegexp(ValueError, "window.*ridiculous",
-                self.checkNonPooled, y=self.panel_y, x=self.panel_x,
-                window_type='ridiculous', window=25, min_periods=10)
+        assertRaisesRegexp(ValueError, "window.*ridiculous",
+                           self.checkNonPooled, y=self.panel_y, x=self.panel_x,
+                           window_type='ridiculous', window=25, min_periods=10)
 
     def checkNonPooled(self, x, y, **kwds):
         # For now, just check that it doesn't crash