Dr.Z
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Hi all,
I've been wondering about this for a while, this is what I came up with, might very well be wrong...
I'm not sure but this is how i think it goes. The 3 digit score correlates roughly to the number of questions you would have gotten right out of 300 if you had received a normal ( medium difficulty) test, since every test is different the actual number of question you got right is probably multiplied by some kind of difficulty factor calculated based on your personal exam toughness...
This would explain why 180 ( 182 now actually...) out of 300 is required to pass, wich gives you 60%.
Now for the 2 digit score, we know that the passing 2 digit score is 75, wich is 60 + 15. So 180 = 75. We also know that the mean is 215 (3dig) = 85 ( 2dig), wich once again seems to be 215/300 = 71% add to that the .15 and we get our 2dig score of 85 ( well yes, 86 actually...)
Ok, i'm really bad at expalining this, i know. So your 2 digit score is the percent of questions you would have gotten right on a normal difficulty exam + 15% ! This mean that anyone answering 84% or more questions right on a normal test gets 99! Wich would also explain why some people say that the 3dig score is more important, since you cant differenciate between someone who gets 84% right and someone who gets 94% right based on 2 digit scores.
Again, I very well might be totally WRONG!
ALL THIS LEADS TO MY QUESTION! all you people who got 99, was your 3 digit scored capped at 255? or can you get 99 and, in the best of cases 299 on 3digit ?
If you have your resluts please confirm or reject this hypothesis. Just curious... ( Is your 2dig = 3dig/300 + 0.15 ?)
Writing it in a month, should be studying not calculating.... oh well, Good luck to all you test-takers !
Dr.Z
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| Dr.Z
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I guess nobody wants to post his results.... That's understandable.
The more i think about it the more it makes sense, the +15% would be added so there would be no more discrimination between the top 15% of students, making the 84% and the 99% equal at a 2digit score of 99. The really competitive residency programs can no longer use those scores as a discrimination and have to base their decisions more on interviews and letters... wich i guess is a good thing.
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| Dr.Z
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Just "bumping" this topic back to the top of the page because i see a lot of messages asking what the scores mean.
So far the formula 2dig= 3dig/300 + 15% seems to work in every case with only minor deviations...
Writing it in 11 days, feeling like i know nothing.
Good luck with your studying.
Oh, also, i calculated a couple of scores in percentiles, knowing that average score on 3digit is 215 and standard deviation around 20. ( From 1stAid 2002 p. 13)
3digit = 2digit = percentile
215 = 85 = 50%
235 = 93 = 84%
255 = 99 = 97,5%
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