matching up Google's hard drive study and smarttools output

In Google's hard drive study, they focused on four smart "signals" that 
are useful in predicting hard drive failure: scan errors, reallocation 
counts, offline reallocations, and probational counts. Of the four, 
reallocation is the only one I recognize in smarttool's output as being 
attribute #5, reallocation sectors count (seen with smartctl -a /dev/sd?).

Since all four items are smart items, what do the other 3 correspond to 
in the smarttools output?

Do scan errors mean the results of a short or long test that fails?

Looking through the list of attributes, my best guess for offline 
reallocations is #198, Uncorrectable Sector Count/Offline Uncorrectable/
Off-Line Scan Uncorrectable Sector Count and probational counts is #197, 
Current Pending Sector Count. But I don't know if I'm correct, or more 
likely, not.

------------------------------------------------------------------------------
Live Security Virtual Conference
Exclusive live event will cover all the ways today's security and 
threat landscape has changed and how IT managers can respond. Discussions 
will include endpoint security, mobile security and the latest in malware 
threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/