Martin_Ice_Web - 9:08 am on Mar 1, 2013 (gmt 0)

tedster, yes, there are some stable results that did not move for month. Unfortunately not in my niche. There are coming new pages daily and going daily. Lot of movement.
But it is ecom related and we have a lot of competition. But old big googles new AI shuffles a lot of silly and spammy pages to the front.
On site i watch in a non ecom niche was #1 and did a complete new site layout. You should think it would suffer at least a little bit but it stays #1.

Automated statistical sampling, maybe?

That could be an answer for big jumps from #5 to #75 and back. Maybe because of lack of sufficient data? I donīt think that they are able to compile all the websites every day and thatīs why pages are jumping. New compiled pages get a boost long time ago compiled pages suffer?
I have this theory since long because weeks ago we saw every thursday a gouge in our referrals only to grow over the week till thursday. But this seems to be on a daily basis now.