bloard - 3:31 pm on Nov 8, 2012 (gmt 0)
A point that might or might not be relevant. My site was hit by October 2011 Panda. Just prior to that time my ratio was 1:1. I had roughly 8,000 indexed and 8,000 not selected. As part of my Panda "recovery" strategy late last year I started deleting poor quality sections of my site.
Now I have 11,000 not selected and 2,000 indexed. My site has continued to loose rankings. Initial Panda cost me maybe 50% google traffic. Now I'm down 90%, and the one constant during that period is that this ratio has continue to increase.