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Here's my analysis for Christmas week:

1) As noted above, Media Create's numbers are significantly below VGC's numbers so the error values given below may not be particularly valid.

WEEK ENDED DEC 27 Wii: 243,706 PS3: 147,349
Prediction Error to 10M thru Jan 31 Prediction Error to 5M thru Jan 31
ioi (original) 215,000 -28,706 -11.8% -133,445 125,000 -22,349 -15.2% -245,127
ioi (revised) 255,000 +11,294 +4.6% -133,445 115,000 -32,349 -22.0% -264,377
ZorroX (original) 145,000 -98,706 -40.5% -173,445 195,000 +47,651 +32.3% -55,127
ZorroX (revised) 175,000 -68,706 -28.2% -203,445 - - - -

NOTE: "to 10M/5M (thru Jan 31)" indicates how far sales will be from the 10M/5M target if the prediction set is 100% correct from now on.

Predictions within 15%.

Predictions worse than 30%.