10+ Year Member
May 18, 2008
Medical Student
U world percentile correlation formula.

Want to try to gauge if this formula works for predicting possible outcome in step 2 ck (since I feel NBME was a weak sauce predictor of my performance.

((Uworld second pass percentile-Uworld first pass percentile)/4)+ uworld first pass percentile= real ck percentile

For me this formula was spot on: (58 percentile- 22 percentile/4)+ 22 percentile= 31 percentile on the real thing

What about other people, does this formula hold up?