PS3 has a higher attach rate than Xbox 360?

[theRepublic]

dcIKeeL said:
The issue i have with the time argument is that, it's to anecdotal. Too maany things are assumed. This is because the impact that time of ownership has on the tie ratio can't be conclusively measured. The most you can get is really rough numbers. One of the biggest problems is that you assume that everyone buys games at the same rate. Meaning that hypothetically, everyone buys 1 game every month they own the console and thats just not true. Some people by 1 game every 5 months, some buy 1 every month some avg 1 every 2 months. Like i said, it's just too anecdotal, too subjective to too many factors.

How is my method anecdotal?  We have data on weekly hardware, and we have data on weekly software.  The end result is an average, just like attach ratio is an average.