This point is very important. Given that salary is not distributed evenly saying a top 3, top 5, top 10 payroll is fine for quick & dirty purposes but doesn't really tell you much outside of a general range within league context. Looking at the 2015 opening day payrolls the mean payroll was approximately 125 million with a standard deviation of about 45 million. With that in mind the best way to group teams based on opening day payroll for 2015 would be as such... 3+ Standard Deviations above mean (Super Duper Mega Rich) (LAD $273) 2+ Standard Deviations above mean (Super Mega Rich) (NYY $219) 1+ Standard Deviations above mean (Mega Rich) (BOS $187, DET $174, SFG $173) 0-1 Standard Deviations above mean (Rich) (WAS $165, LAA $151, TEX $142, PHI $136) 0-1 Standard Deviations below mean (Status Quo) (TOR $122, STL $121, SEA $120, CHN $119, CIN $117, CHA $115, KCR $114, BAL $110, MIN $109, MIL $105, COL $102, NYM $101, SDP $101, ATL $98, ARI $92, PIT $88, CLE $86, OAK $86) 1+ Standard Deviations below mean (Poor) (TBR $76, HOU $71, MIA $68) With those groupings established, 3 of the 9 teams in the rich & above brackets (33%) qualified for postseason play, 6 of the 18 teams in the status quo (33%) qualified for postseason play and 1 of the 3 poor teams (33%) qualified for postseason play. You've done all of this nice analysis and then you took it and based your conclusion on a 1 season sample.