MikeB on 21 November 2009
For example it can be used to compare PS3 with PS1 sales taking equal timeframes.
The PS3 sold 27 million last September and the PS1 22.5 million taking equal timeframes.
The PS3 has to top 28.2 million in Sony's upcoming financial report for 2009 to stay ahead (which is easy, but it may be interesting to compare for future quarters as well).
Also the 360 can then be better compared to PS3 sales or for example Wii sales developments can be better compared to the PS2.
