Here is where I'm at:
Just did a rank checker run for the first 100 page titles showing in the Site: search command. Avg position on Google is 21; on Yahoo 6; on Bing 4.
For many years my Google and Yahoo results matched closely. Too bad I only get 9% visitors from combined Yahoo and Bing, and 71% from G. Before being Pandalized my Google % was close to 90.
Conclusion: Panda has lowered my average position by around 15 slots. I've lost 19% of google visitors according to G Analytics. However my total visitors are down about 45% (so something doesn't add up there).