TST: fix numpy < 1.6 issues with dot instance method

Author: wesm

pandas/stats/ols.py

@@ -444,7 +444,7 @@ def predict(self, beta=None, x=None, fill_value=None,
 
             x = x.reindex(columns=self._x.columns)
 
-        rs = x.values.dot(beta.values)
+        rs = np.dot(x.values, beta.values)
         return Series(rs, x.index).reindex(orig_x.index)
 
     RESULT_FIELDS = ['r2', 'r2_adj', 'df', 'df_model', 'df_resid', 'rmse',

pandas/stats/tests/test_ols.py

@@ -297,7 +297,7 @@ def test_predict(self):
 
         exog = x.copy()
         exog['intercept'] = 1.
-        rs = Series(exog.values.dot(model1.beta.values), x.index)
+        rs = Series(np.dot(exog.values, model1.beta.values), x.index)
         assert_series_equal(model1.y_predict, rs)
 
         x2 = x.reindex(columns=x.columns[::-1])
@@ -307,7 +307,7 @@ def test_predict(self):
         pred3 = model1.predict(x=x3)
         x3['intercept'] = 1.
         x3 = x3.reindex(columns = model1.beta.index)
-        expected = Series(x3.values.dot(model1.beta.values), x3.index)
+        expected = Series(np.dot(x3.values, model1.beta.values), x3.index)
         assert_series_equal(expected, pred3)
 
         beta = Series(0., model1.beta.index)