Final Amazon June rankings
PS4 #8
Xbox #49
Xbox+Kinect+Titanfall #50
Interestingly the Titanfall bundle looks to essentially be sold out for good and is out of top 100 hourly.
May rankings: PS4 #6, Titanfall bundle #39
Last month Amazon actually worked well as an NPD predictor. So, trying it again, with no sophistication, I basically categorize it as, May:June
PS4 down a little
Xbox One: Now two SKU's, each down a bit from the single SKU in May.
PS4 May 194k
X1 May 76k
PS4 June: 180k?
X1 June: 65kX2=130k?
Adjusted for 5 weeks:
PS4 June: 225k
X1 June: 162.5k
I think this is an interesting idea of June sales, and actually seems completely reasonable. It for example, would tell us not to expect X1 to beat PS4 because of the $399 SKU in June. But OTOH, X1 would see a healthy sales increase, if these numbers hold any water.
It might be interesting to apply a little more mathematical rigor here, but I'm not really sure how to go about it. Saying PS4 dropped 2 spots from 6, you'd have to say PS4 dropped 33%. That doesn't seem intuitive to how much I'd expect PS4 sales to decline. I'd expect less decline. Alternatively, you could count every ranking spot as equal, and worth 1%. Thus PS4 dropped 2 spots or 2%, and the X1 SKU's ~10 spots or 10%. This doesn't work satisfactorily either, although it probably comes closer to what I think. What you'd probably need is some combination of the two methods. Dropping spots when highly ranked should count more, but not strictly in terms of percentage of the previous ranking. Not sure how to accomplish that, need to think about it.