He used data from four seasons , 1976 - 77 and 1987 - 88 .
He concluded that a player participating in his contract year had no effect on total average runs created during the 76 - 77 seasons and a negative effect in 1989 .
Using data from four seasons , 1976 - 77 and 1987 - 88 , he concluded that a player participating in his contract year had no effect on total average runs created during the 76 - 77 seasons and a negative effect in 1989 .