Hello,
I'm doing a quick survey to see the correlation between the number of pages in your sitemap, how many pages indexed, and whether your domain has been hit by Panda. I realize there are many factors outside of this but just wanted some basic information if you would like to share.
All of this information stems from your Google webmaster tools section >> Sitemap.
For one of my sites:
Submitted URLs = 207,188
URLs in web index = 204,940
Pandalized = Yes
2 Months prior before starting to fix anything
Submitted URLs = 207,188
URLs in web index = 27,659
Pandalized = Yes