A post at
http://clubs.yahoo.com/clubs/tc2000trades
indicates that TC2000 currently has some data errors.
Post 4002:
A big "hooker" to accurate market forcasts is accurate data.
TC2000 still carries bad QQQ low quotes for 11/19.
It should be L 39.49 not 38.71.
Big difference!
If you trade QQQ's regularly check TC against another data source. This bad quote stuff is happening almost every week now and the fixes are VERY late.
For very long term studies a point or so won't matter too much in the long run.... but in the short run it could be a killer. Especially if you are using the data for stops.
I would suggest double checking any wierd price data on your favorite trading stock since this is not just a QQQ problem.
(Yes, I notified TC last WEEK of the problem).
Post 4009 indicates the problem may be corrected "VERY soon" (whatever that means):
They are rebuilding the RT system and it is affecting all the data. They said it would be done VERY soon, and then all the data will be even cleaner than it was before. But in the meantime, they cannot take the data away.