Using poker tracker, the significance of Went To SD %

[ZeeJustin]

I absolutely love and highly reccommend poker tracker, and I've said that many times before.

The 2 numbers I use the most while at the table are flops seen % (some people use VP$IP, just a matter of celsius vs. farenheit, use whatever you are used to), and PFR %. These numbers are obviously great for preflop play, but what about post flop play?

I'm guessing the Went to SD % statistic correlates directly with how loose people are after the flop. Should I be using this to determine if someone is a loose caller? Obviously observing is great and all, but I play 92 tables at once, and sometimes I won't have any read on players after 100 hands with them.

Is there a statistic that correlates well with aggressiveness after the flop?

What statistics besides % flops seen, and PFR% does everyone else use the most?