The Official July NPD Thread (data for 4 weeks ending 8/2 comes @ 6:30 est)

[Gobias]

TWRoO said:
You don't use the VGC number to divide by to work out %age differences.

if the dirrerence between VGC and NPD (for PS3) is ~45k... then it's 45/225 = 0.2

20% difference.

180k was already scaled to US, so it is around 25%.