Tim, FYI - at the top of each page of this board is a whole bunch of info. I normally hide it in order to display more posts on my screen; there is a link to Hide or Show Board Info at the top of each page.
When Show Board Info is active, the very last bit of info explains the meaning of the "+" and "-" in the Time and Sales data, and I've copied it below:
"Does the time/sales information posted by sublime tell us whether a transaction was a buy or a sell?"
Nope, and this is why. Thanks to bob41 for the explanation!
The meaning of the plus (+) and minus (-) signs as they appear on the Time and Sales Tape is the simply the direction of the last "tick" or transaction print. The plus sign indicates that the transaction (tick) was higher than the previous one and visa versa, the minus sign indicates that the last tick was lower than the prior transaction.