Im doing an analysis currenty on HD console profitability for third party developers and my main source for sales is of course Vgchartz. Since im relying so heavily on game sales data and that has been historically less accurate, in which direction is the overall inaccuracy?

My periods of study are January to March 2007 and likewise 2008. Im dealing with an average of all games released for those periods so I was wondering in which direction would my variance take and how much might I want to factor in to ensure overall accuracy?

My current belief is that the games from 2007 would be undertracked due to spotty coverage in Europe but I have no idea what to expect from 2008.

Any time from Japan is fine

2007 should be good in the Americas

2nd half and out of 2007 should be good in Others.

I'm not sure, but I think that's roughly it.

So first half of 2007 should be bad for others? (Reading between lines here)

 Yeah, I guess so.

Also, the Ps3 wasn't even there for the first quarter or so.

360 might have a slight HW problem there, as VGC states 2.5M for first 6 months, and then 3.6M for the next 5 (no holiday).

If you look at Others, there are some weeks early in 2007 only 20 titles there and such.