Ask YC: How does YC rate of acceptance correlate to specific timeliness?

In the y-combinator application it's stated that there's an advantage to early applicants. While logical on a general level I wonder if the numbers bare out much in the way of earliness on a finer gradient in terms of trends on a narrower scope, for example how people who submit applications the same day the applications open vs say a week after. The micro view on this would be rather interesting.