# Correlation between mistakes and step 1

#### stronghold

5+ Year Member
I really feel crap after the exam. I discover more mistakes every day. Is there any correlation between number of mistakes and the real deal? Are there people who had more than 30 mistakes and still have 250 or high 240?

#### Phloston

7+ Year Member
Based on the NBME exams, 8 wrong = 266; 9 wrong = 264. Those are 200-question tests, so 322/200 x 9 is ~14-15 wrong for a 264 on the real deal.

I'd say a 260 is ~3 wrong/block = ~21 wrong on the real deal.

That's why Free-150 is so accurate. If you get 93% on that, you're looking at ~260 on the real deal, since that translates to ~300/322 = ~21-22 wrong.

Chances are, you probably had a couple blocks that you rocked and then others that you got 4 or 5 wrong. But it balances out.

Ionian
OP
S

#### stronghold

5+ Year Member
Based on the NBME exams, 8 wrong = 266; 9 wrong = 264. Those are 200-question tests, so 322/200 x 9 is ~14-15 wrong for a 264 on the real deal.

I'd say a 260 is ~3 wrong/block = ~21 wrong on the real deal.

That's why Free-150 is so accurate. If you get 93% on that, you're looking at ~260 on the real deal, since that translates to ~300/322 = ~21-22 wrong.

Chances are, you probably had a couple blocks that you rocked and then others that you got 4 or 5 wrong. But it balances out.
Interesting! Thank you! Does this mean if you have 30 mistakes you are in the 250 range!!

Any other inputs and experiences??

OP
S

#### stronghold

5+ Year Member
What about 30 and 40 mistakes, respectively?

#### ChessMaster3000

7+ Year Member
You can't use a linear regression for mistakes--it just depends on the form you take entirely

OP
S

#### stronghold

5+ Year Member
You can't use a linear regression for mistakes--it just depends on the form you take entirely
Interesting, but I guess we can estimate! I don't think I am the only person obsessive about this, so probably there are guys who counted there mistakes and had there scores

#### ChessMaster3000

7+ Year Member
Interesting, but I guess we can estimate! I don't think I am the only person obsessive about this, so probably there are guys who counted there mistakes and had there scores
Oh i'm all for it also--and would love to see the data. I'm just saying that we cant come up with a formula that says 2 errors = 1.3 points on the test, because at different parts of the score distribution, an error has a varying effect on your score. thats all!

OP
S

#### stronghold

5+ Year Member
I understand. This exam made brain to shutdown. I even misspelled "their"

#### BlueArc

5+ Year Member
I understand. This exam made brain to shutdown. I even misspelled "their"

OP
S

#### stronghold

5+ Year Member
I don't have an experience yet!

#### Volkmann

He
Based on the NBME exams, 8 wrong = 266; 9 wrong = 264. Those are 200-question tests, so 322/200 x 9 is ~14-15 wrong for a 264 on the real deal.

I'd say a 260 is ~3 wrong/block = ~21 wrong on the real deal.

That's why Free-150 is so accurate. If you get 93% on that, you're looking at ~260 on the real deal, since that translates to ~300/322 = ~21-22 wrong.

Chances are, you probably had a couple blocks that you rocked and then others that you got 4 or 5 wrong. But it balances out.
Hey Phloston. You seem to know a lot about this stuff. Mind telling me how many experimental questions there are??
The free 150 questions were so easy, I was hoping that I'd need to get a smaller percentage right to get a comparable score in the real thing. I did mine a week ago and already my stupid mistake count is at 10. Bye bye 250

#### elektroshok

10+ Year Member
He

Hey Phloston. You seem to know a lot about this stuff. Mind telling me how many experimental questions there are??
The free 150 questions were so easy, I was hoping that I'd need to get a smaller percentage right to get a comparable score in the real thing. I did mine a week ago and already my stupid mistake count is at 10. Bye bye 250
Aww poor thing! Already at 10 mistakes?!?!?

#### Volkmann

Aww poor thing! Already at 10 mistakes?!?!?
Haha, considering I can remember maybe 70 questions. . .. Yeah, poor thing sounds right

OP
S

#### stronghold

5+ Year Member
After long analysis:
19-20 mistakes: 260
29-32 mistakes: 250
41-45 mistakes: 240

However, I don't know if experimental questions still there in step 1. I hope no, but I guess there were no experimental questions in step 1 for at least the last year.

Another point, I don't know yet what get you more points, easy questions or hard ones?!
For example, 25 mistakes in NBME 13= 242, while 28 mistakes = 240!! So there is a big variability in weight of questions

#### Volkmann

After long analysis:
19-20 mistakes: 260
29-32 mistakes: 250
41-45 mistakes: 240

However, I don't know if experimental questions still there in step 1. I hope no, but I guess there were no experimental questions in step 1 for at least the last year.

Another point, I don't know yet what get you more points, easy questions or hard ones?!
For example, 25 mistakes in NBME 13= 242, while 28 mistakes = 240!! So there is a big variability in weight of questions
So you're saying that 90% right on the exam, or roughly 30 mistake equates to only 250?? Honestly I thought it'd be around 260 since the free questions give you 260 with 90% right. I don't know what to believe.

#### ChessMaster3000

7+ Year Member
So you're saying that 90% right on the exam, or roughly 30 mistake equates to only 250?? Honestly I thought it'd be around 260 since the free questions give you 260 with 90% right. I don't know what to believe.
where are you getting that? I've read elsewhere that 90% equals 270.

OP
S

#### stronghold

5+ Year Member
93% (not 90%) on free 150 Qs = 260

#### Volkmann

93% (not 90%) on free 150 Qs = 260
That one was so much easier than the real thing though. Let's hope it's less strict

#### Anastomoses

##### secretly an end artery
Removed
Account on Hold
Um...just...you know, learn stuff as clearly as you can. Next.

OP
S

#### stronghold

5+ Year Member
Any other experiences?

OP
S

5+ Year Member
Bump!

#### drrimcrickert

2+ Year Member
Based on the NBME exams, 8 wrong = 266; 9 wrong = 264. Those are 200-question tests, so 322/200 x 9 is ~14-15 wrong for a 264 on the real deal.

I'd say a 260 is ~3 wrong/block = ~21 wrong on the real deal.

That's why Free-150 is so accurate. If you get 93% on that, you're looking at ~260 on the real deal, since that translates to ~300/322 = ~21-22 wrong.

Chances are, you probably had a couple blocks that you rocked and then others that you got 4 or 5 wrong. But it balances out.
i know this is an old post..but how many would 11 mistakes be?? thanks

#### iki4life

10+ Year Member
people only getting 20-40 questions wrong on the real thing is pretty insane to me.

#### drrimcrickert

2+ Year Member
people only getting 20-40 questions wrong on the real thing is pretty insane to me.
what do you mean?

#### iki4life

10+ Year Member
what do you mean?
I mean that thats a very low number of questions to get wrong on a 300+ question test.

Joanna1987

#### TheOther

2+ Year Member
I mean that thats a very low number of questions to get wrong on a 300+ question test.
7x40=280 questions, fam

#### drrimcrickert

2+ Year Member
7x40=280 questions, fam
thanks for your reply, the exam was actually 276 questons. i took it on april 6 2017. lots of audio questions

#### TheOther

2+ Year Member
thanks for your reply, the exam was actually 276 questons. i took it on april 6 2017. lots of audio questions
Like heart sounds? What other audio questions could there be?

#### drrimcrickert

2+ Year Member
Like heart sounds? What other audio questions could there be?
Like there might be a male/female patient explaining what she's feeling and the question asks what could be the diagnosis, these were actually fun questions i looked forward to!

##### Critically Caring
5+ Year Member
You can't use a linear regression for mistakes--it just depends on the form you take entirely
Pretty much this. Variation can be pretty high.

#### TheOther

2+ Year Member
Like there might be a male/female patient explaining what she's feeling and the question asks what could be the diagnosis, these were actually fun questions i looked forward to!
On Step 1??? I've never heard of these types of questions before...

#### drrimcrickert

2+ Year Member
On Step 1??? I've never heard of these types of questions before...
yeah there were several of them on my exam. lucky i was able to practice some of them on nbme 19. they were actually fun questions. i guess they might be experimental questions (new type of asking questions)