PS3 has a higher attach rate than Xbox 360?

[theRepublic]

dcIKeeL said:
can some1 explain to me what time released has to do with attach rate???............if a console has been out for 8 years and has sold 50 million units....and another console has been out for 3 years and has sold 25 million units, the 8 yr console should sell twice as many games in order to claim the consoles sell software equally....how does extra time released factor in? When analyzing attach rate shouldnt the numbers of consoles owned be the only thing considered?

Do you by all the software you want at once when you by the console?  No, and neither does anyone else.  It is too expensive to do all at once, and some of the games you want are probably not released yet.

Slowly, over the life of the console, each owner builds up their game library.  So a new owner might only have two or three games, while someone who has had the console for a year might have five or six games.  That messes up the attach rate calculation if console have been on the market for different time periods.

Attach rates are pretty useless to compare anything really.  The only reason it is used is because it is an easy calculation and the data needed for the calculation is usually easier to come by.

The best way to look at things is on a week by week basis.  That way, you can account for time in your calculations.  I've done that here.