Hope this helps for analyzing ranking and traffic changes. Only the changes right around these dates are likely to be caused by Panda. Links go to the thread where the discussion occurs.
Data Refresh = New website data only, no algorithm change
Jan 22,2013 [webmasterworld.com]
Nov 21, 2012 [webmasterworld.com]
Nov 6, 2012 [webmasterworld.com]
Sep 18, 2012 [webmasterworld.com]
data refresh Aug 20, 2012 [webmasterworld.com]
data refresh Jul 24, 2012 [webmasterworld.com]
data refresh Jun 25, 2012 [webmasterworld.com]
data refresh Jun 08, 2012 [webmasterworld.com]
data refresh Apr 27, 2012 [webmasterworld.com]
Apr 19, 2012 [webmasterworld.com]
Mar 23, 2012 [webmasterworld.com]
Jan 19-24, 2012 [webmasterworld.com]
data refresh Feb 26, 2012 [webmasterworld.com]
Nov 19, 2011 [webmasterworld.com]
"minor" update Oct 13, 2011 [webmasterworld.com]
Sep 27, 2011 [webmasterworld.com]
Aug 12, 2011 [webmasterworld.com]
Jul 23, 2011 [webmasterworld.com]
( our monthly Update thread) Jun 16, 2011 [webmasterworld.com]
May 10, 2011 [webmasterworld.com]
Apr 11, 2011 [webmasterworld.com]
Feb 24, 2011 [webmasterworld.com]
[edited by: tedster at 4:35 am (utc) on Jan 28, 2013]
