Save regression residuals as object element

urbansim_templates/models/regression.py

@@ -101,6 +101,7 @@ def __init__(self, tables=None, model_expression=None, filters=None, out_tables=
         # Placeholders for model fit data, filled in by fit() or from_dict()
         self.summary_table = None 
         self.fitted_parameters = None
+        self.residuals = None
         self.model = None
 
 
@@ -189,7 +190,7 @@ def fit(self):
         # code later on to not rely on RegressionModel any more. 
 
         self.fitted_parameters = results.params.tolist()
-
+        self.residuals = results.resid
 
     def run(self):
         """