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So the total number is the way we see how close each person was?

Why not summing the differences between each prediction and the actual value?

The way it is right now I could say 9M for PS4, 11M for WiiU and 18.5M for XOne and would be totally accurate...far more than someone saying 18M for PS4, 9.5M for WiiU and 12M for XOne. Does it make sense?



Prediction made in 14/01/2014 for 31/12/2020:      PS4: 100M      XOne: 70M      WiiU: 25M

Prediction made in 01/04/2016 for 31/12/2020:      PS4: 100M      XOne: 50M      WiiU: 18M

Prediction made in 15/04/2017 for 31/12/2020:      PS4: 90M      XOne: 40M      WiiU: 15M      Switch: 20M

Prediction made in 24/03/2018 for 31/12/2020:      PS4: 110M      XOne: 50M      WiiU: 14M      Switch: 65M