tedster - 1:28 am on Jan 9, 2012 (gmt 0)
What i sense is that each iteration to date, enables a range of thresholds, related to new content additions , and releasable keywords.
That's worth consideration, Whitey. Remember when Amit Singhal commented about a later Panda iteration that it went "further into the long tail"? That seems to indicate a strong keyword-driver. "Releasable" keywords and "new keywords" could well play into the picture.
It might be worth it for anyone who is still struggling with Panda, even a little bit, to analyze their actual keyword traffic for patterns over time.