tomohiko11のアイデア帳
Panda uses a steep threshold. Pages are either affected or not.
The threshold isn’t the same for each domain. Links seem to cause some difference.
Almost all keywords on an affected page drop in ranking.
Entire sections of pages are affected. Drops for a single page are unlikely to be caused by Panda.
You can recover from Panda by removing low quality pages from the index (canonical, noindex, etc.).