Ask HN: YC Applications w/ traction VS those without

I was wondering if anyone have an idea of the ratio between YC application submissions for startups which already have traction (users, paying customers or somewhat already funded) and those who haven't publicly launched yet.

How much do you think a startup who's already getting users, capital or market validation would increase its chances of getting into a YC batch?

Suppose you run YC, let U be the number of users, R the net revenue, F the total amount of funding from previous rounds, could you make it a rough equation to express the chance increment percentage you think its appropriate? If you feel its necessary, add other variables quantum sufficit.