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The fact that he has played more than 18 of his last 39 hands in our first observations of him means he is probably a bit looser than he should be. Our read could be completely off, and he might end up being a regular, or even tight player, but I think it is better to add probabilities to his stats, rather than just call them null and void. I don't know how to properly assess this probability, but I am sure it is possible somehow.
Just from my random speculation, I would guess that there is a only a 15% chance that his VPIP is under 20, 40% chance his VPIP is between 20-35, 25% chance his VPIP is 35-45, and 15% chance his VPIP is 45-55, and 5% chance his VPIP is over 55. These are just guesses, but I think there is a decent chance he is a loose player, even after only 39 hands.
If you had a player pegged at 85 VPIP after only 20 hands, would you think that meant anything?
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http://archiveserver.twoplustwo.com/show...e=0#Post2852240
I calculate 90% confidence is true VPIP is between 31 and 60.