Thanks BHR.... but it isn't quite right I don't think.
Not totally sure what you have done to get those figures..... but as an example, your Wii prediction should be this.
Actual - prediction = actual discrepancy
(1,838,350 - 1,910,000 = -71.65)
Then divide by the actual figure again
(-71.65 / 1,838,350 = -0.0389......)
then multiply by 100
(-0.0389.... X 100 = -3.89.... = ~ 3.9% discrepancy)
(Also the +ve and -ve bits don't matter, they can be added in afterwords, clearly you predicted higher than the actual so your discrepancy would be: +3.9%)
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Edit.... ignoring a couple of rounding mistakes your PS3 and 360 figures were fine, so I thikn you just made the mistake of using the updated Wii figures rather than the originals which Skeezer posted higher up.
