vaibhavbora
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hii frns if u have taken any of nbme offline forms please post ur scores here so we can compare performances ,,,
mine ws 140/200 in form 1 how to interpret it ?
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| usmlekiller
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94 260
92 255
90 250
88 245
86 240
84 235
82 230
80 225
78 220
76 215
74 210
72 205
70 200
68 195
66 190
62 180
according to a post.....here in this forum
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| hitesh
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The numbers on the left, are those the precentage of questions that you get right?
Does that apply to form 1 only or all?
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| usmlekiller
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i believe thats for all forms... and yes on the left its %.....not sure h ow accurate this is though...
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| vaibhavbora
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" for offline form... 200 pattern... u can use this... not accurate but i got frm smwhr..
open spreadsheet... means MS excel
in A2 box copy paste this function...
=IF(AND(50<=A1,A1<=200), INT(70.25-0.0000002068*(A1*4)^3+0.0000938*(A1*4)^2+0.3009*(A 1*4)),"Enter a number between 50 and 200")
now put a value in A1 box between 50 to 200...... and go to A2, go to end of the function and hit enter...
here is the estimated score...
try out whether it works"
this was reply i got from some other forum ,,,
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| usmlekiller
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| hitesh
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Thanks guys.. All i wanted was a vague idea about my performance and both the ways I can get that.. i guess i'll just average the two.  i am gonna buy one of the NBMEs in a few days..
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| usmlekiller
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i tried doing it the other way in excel it didnt work....is it pretty similar to the other range?
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| hitesh
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well, try using this command
=IF(AND(50<=A1,A1<=200),INT(70.25-0.0000002068*(A1*4)^3+0.0000938*(A1 *4)^2+0.3009*(A1*4)),"Enter a number between 50 and 200")
Yea, i know it looks the same, but there were a couple of spaces where none should have been ..Well, compared to the reference range you had listed, this method grossly overestimates the score. e.g. a score of 160/200 would correalte to 247
But , at the same time, the scale you listed, does look a bit unreal.. I mean to get a 247, one needs to get abt 90% questions right.. In my personal opinion, i think it underestimates your performance.
anyways, these methods are meant to give you a vague idea. Also, no one can be sure how many questions he/she actually got right.wrong
Good Luck!
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| skm95
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vaibhavbora wrote:
" for offline form... 200 pattern... u can use this... not accurate but i got frm smwhr..
open spreadsheet... means MS excel
in A2 box copy paste this function...
=IF(AND(50<=A1,A1<=200), INT(70.25-0.0000002068*(A1*4)^3+0.0000938*(A1*4)^2+0.3009*(A 1*4)),"Enter a number between 50 and 200")
now put a value in A1 box between 50 to 200...... and go to A2, go to end of the function and hit enter...
here is the estimated score...
try out whether it works"
this was reply i got from some other forum ,,,
I had posted that equation on SDN forum, and it was based on the assumption that all questions are equal, which, I think, is not true. I explained this fact in my next post on SDN:
http://forums.studentdoctor.net/showpost.php?p=66...
So, based on the assumption that all questions all NOT equal, there is no accurate formula to compute your NBME score based on percent correct answers. There is a way to approximate it, using average weighted score for all questions and using cross-correlation of NBME provided data, but it is very crude and may not be very accurate, i.e. variation of as much as +/- 5% (which, I think, is huge).
See attached table showing all this data. The table was derived using following equations (if you want to do it yourself in spreadsheet):
Cell A1 = Enter your NBME score
Cell A2 = 3-Digit score:
=IF(AND(200<=A1,A1<=800),ROUND((70.2-0.0000002067*A1^3+0.0000937*A1 ^2+0.30096*A1),0),"Error")
Cell A3 = 2-Digit score:
=IF(AND(100<=A2,A2<=300),IF(A2 > 236, 99, ROUND((0.4715*A2-12.5),0)),"Error")
Cell A4 = Percentile score:
=IF(AND(200<=A1,A1<=800),ROUND(NORMSDIST((A1-500)/100)*100,2)," Error")
Cell A5 = Approx. questions answered correctly (percent):
=ROUND((A2-25)/2.5,1)
Attached Files:
NBME-SCORE-DATA.PDF (31 KB, 34 downloads)
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| hitesh
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Thank you for sharing skm95 
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| usmlekiller
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hi hitesh i actually copied n pasted that range from another post in this forum....its not derived by me....i also didnt think it looked rite cause it requires massive % to get a 99....and if one were to use statistics that kaplan gave out to....they said low 70s in their qbank means u will be in 90s in step 1....and above 75% is almost guaranteed 99....so by this correlation....neither method seem to be right because according to the excel file...u need 86% to get a 99....and im sure kaplan qbank is not harder than step 1 lol so thats just my opinion....ne ways best way is to take it from nbme site itself...gl!!
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| vaibhavbora
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@skm 95 ,, how does it works ?? 
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| skm95
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vaibhavbora wrote:@skm 95 ,, how does it works ??
I am not sure I understand your question? Are you referring to the 1st post of this thread? If so, then you have 140/200 = 70%; if you look it up in pdf file I posted, you will notice it corresponds to 200 3-digit score or 430 NBME score. But as I mentioned this is all derived using cross-correlation of data, therefore accounting for +/5 error, the 3 digit score can be anywhere in the range of 190-210.
If you want the exact number(s), then your best option is to take one of the NMBE online.
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| vaibhavbora
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Posts: 128
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ohkk got it thnks people ,,,
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