Duke statistics PhD interview

[h.ude]

I'm going to Duke in a couple weeks for what was described to me as a "small group applicant visit." A couple questions for anyone who's been through this in the past:

What are the odds of getting an offer given that they're paying for me to visit? Is this actually just another interview round, or do I have a pretty good shot at this point?

Secondly, what do you wear to something like this? For a normal interview I would go with suit and tie, but that seems out of place for something like this. Khakis and a tie?

Thanks.

[uromastyx]

Congrats! Seems like your odds are great.

Keep it business casual.

[h.ude]

I saw one person from April 2009 got flown down, waitlisted and then rejected. Any ideas as to how many people get paid visits?