i           p                residual
   0     [1.0000,0.0000]       2.39000000
   1     [1.6900,-0.6100]       0.21259029
   2     [1.9751,-0.9305]       0.00733465
   3     [1.9941,-1.0036]       0.00202400
   4     [1.9950,-1.0093]       0.00199611
   5     [1.9950,-1.0095]       0.00199608