Add regression info to SampleAnalysis

--HG--
extra : amend_source : 3c50df0b848c27fcb1092eaf4288b5eba423b158
extra : histedit_source : 16de9a1fa364820b95588a400593fc42f6ed356d%2Cae35e305e8542d38520fe8cb37a2149cc099a468