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kowenicki said:

Say PS3 manages to sells 1m consoles in Sept, it will be down yoy ytd by approx 400k

Say 360 manages to sell 400k consoles during Sept, it will be up yoy ytd by approx 400k

Perspective...

PS3 had the momentum Jan to Aug 08 and 360 had the momentum Jan to Aug 09, so obviously a 9 month YOY comparison will be unfavourable to PS3 but favourable to 360.

However, a year lasts 12 months, so what counts is not your "allow me to narrow the goalposts so I can suit my own purposes" comparison, but instead the YOY data come the end of December.