lucy24 - 12:09 am on Feb 8, 2013 (gmt 0)
For me the "not selected" appears to be the difference between the "Ever Crawled" and "Total Indexed".
You would think so but it isn't. If you've got access to any of your old graphs, do the arithmetic. Just recently I noted a hiccup where Not Selected changed by one number and Total Indexed changed by a different number (don't remember the details, but I mentioned it in another thread) with no corresponding change in Ever Crawled-- so I'm left with a statistically meaningful number of pages that simply disappeared.