a   b   i  x                   y                   i_shift_lag i_shift_lead
pan pan 1  0.3467901443380824  0.7268028627434533  -           2
eks pan 2  0.7586799647899636  0.5221511083334797  1           3
wye wye 3  0.20460330576630303 0.33831852551664776 2           4
eks wye 4  0.38139939387114097 0.13418874328430463 3           5
wye pan 5  0.5732889198020006  0.8636244699032729  4           6
zee pan 6  0.5271261600918548  0.49322128674835697 5           7
eks zee 7  0.6117840605678454  0.1878849191181694  6           8
zee wye 8  0.5985540091064224  0.976181385699006   7           9
hat wye 9  0.03144187646093577 0.7495507603507059  8           10
pan wye 10 0.5026260055412137  0.9526183602969864  9           -
