Out of everyone, the Cubs rank in the top three percent in winning. They rank in the top one percent in run differential, and in OPS differential. That’s why you could make the argument they were even a little unlucky. The best ranking here is OPS differential — in that specific category, the Cubs rank 12th.
I decided I wanted to go another step further. As much as I like those general statistics, an overall rank does nothing to capture performance against league spread. I feel like performance should be evaluated differently if it occurred in a season with very much or very little parity. So for every individual league-season, I calculated the standard deviation in each of the three stats. Then, for every team in every season, I calculated z-scores for each of the three stats. A z-scores just measures the number of standard deviations away from the average. Here are the new Cubs rankings, including a fourth bar, which just takes the average of the three z-scores.
The Cubs manage to shine even more. By winning, they’re just out of the top 10, but they’re now fifth by run differential, and second by OPS differential. The average of the three z-scores puts them in sixth. The five teams ahead of them:
1984 Tigers (won World Series)
1986 Mets (won World Series)
1995 Indians (lost World Series)
2001 Mariners (shut up)
1944 Cardinals (won World Series)
There are a lot of ways to try to slice this, but you could convincingly argue this identifies the best teams ever (or at least since 1913). The Cubs would fit in pretty well with the group. This analysis loves those 1984 Tigers — they finished with eight more wins than anyone else, and across the three stats, they were an average of 2.63 standard deviations better than the mean. The Cubs show up at an average of 2.38 standard deviations better than the mean. That doesn’t make them the best team in baseball history, and I haven’t even made an attempt to adjust for the National League seemingly being worse than the American League, but the Cubs are around the best ever. They could hold their own in conversation.