Attach Rates: An investigation into Software over Hardware Sales

[theRepublic]

DnE said:

Its a little more complex than that.

You need to know when the software was sold relative to the purchase date of the console.
Then divide the total number of software sold for each month after purchase date of console by the toal number of consoles which have reached that month after purchase.

What you would expect is more software nearer the original purchase of the console pattering out later in life

This sounds a bit like what I was doing in the thread I linked to.