There are 3 variables that impact the chances of interview
1. Holes created when selection was made due to duplicate entries, fraud and etc...
2. Disqualified applicants (visa denial because it does meet the requirement and not honest selectee) and do not procced selectee
3. Overflow countries (some countries with more applicants than 3,500 selectee)
1. 26000 (highest so far in forum)
18750 (15% for Asia from 125k selectee)
To get the holes created % calculation:
18750/26000 = ~72%
So, 38% in the running case #created.
Take your case number and minus 38%, you should get your actual rank #.
e.g. 15000 (case #) x 0.72 = 10,800 (actual rank # without holes)
2. Based on past year statistic, Asia have 50-60% success rate from applicant to get visa.
So, we have take your actual rank # minus 40% to eliminate the failed applicants.
e.g. 10,800 x 0.6 = 6,480
3. In Asia there are 2 countries has more than 3,500 selectee, so you can takes 3000 selectee out from 187500 and that is 16%.
e.g. 6,480 x 0.84 = 5443
Conclusion:
If your case # is 15000, you will be 72% (5443/7500) which is within the safe bracket.
Anything above 100% is consider unsafe bracket.
The above analysis is just based on my personal analysis.
With the assumption that the figure presented are even distributed.
This analysis only applied to Asia and it only make sense when the quota for visa is not over.