USMLE STEP 1, 2CK: BIOSTATS "QUICK REVIEW"

[@Tasniaaaaaaaa]

I take Step 2 this week and I think I just learned more biostats in 26 minutes than I did in 3 months worth of Uworld problems. Not all heroes wear capes. 💥

[@riyazumab]

omg me too and im 4 weeks away goodluck!!!!

[@RandyNeilMD]

Glad it was worth the time... Keep me posted on your progress.

[@Be1smaht]

what was on the test?

[@natiaturabelidze4330]

Every single video is a gift, literally! Thank you Dr. Neil. I'm always excited to get notifications from your channel!

[@RandyNeilMD]

Natia, I appreciate the nice comment. Keep studying HARD!!

[@fereshtahkhoshbakht1999]

Exactly!!👌👌God bless him🤲🏻

[@mohammedbahnasy6877]

Before watching Dr Neil's videos I felt like an absolute mess when faced with a Biostats Q and now it seems too easy it's unbelievable! My only regret is that I didn't find these videos earlier as my Step 3 is 1 week from today but even so they were more helpful than a whole 2 weeks of studying Biostats so thank you so much Dr Neil and God Bless you! I am literally going to recommend this channel to everyone I know! Good luck everyone 🙏

[@RandyNeilMD]

Mohammed, Thank you for taking time to type such a nice comment. Glad the videos have been helpful.

[@mohdx77]

The genius of your videos is that they offer something very different. Its very hard to establish yourself nowadays teaching on the Internet. The competition is simply not fair. Your videos however target a part of the material that most larger comapnies don't cover too well (not in a practical way at least). Very grateful for your work. My CK is tomorrow 🙏🙏

[@RandyNeilMD]

Thank you for taking time to leave a thoughtful comment. Sincerely appreciated. I hoe you CRUSHED CK!!

[@orlando666100]

the person who gave you a thumbs down is probably mad cause they didnt find this video before their test

[@RandyNeilMD]

Orlando, Ha.. It's ok. I work in Psychiatry... Dislikes are just part of the process.

[@michaeldasso4024]

For the Odds Ratio question, I believe the answer should be (60/40)/(200/160). Odds Ratios (a/c)/(b/d) represent the odds of exposure among cases (a/c) vs odds of exposure among controls (b/d). In this problem, being old is represented as the exposure (a,b) and the case is represented as a low score (c,d).

[@Mervis_Radio]

Just to add a little to this. His equation/answer was just written incorrectly. it should have been "(60/200)/(40/160)" as opposed to "(60/200)/(40)/(40+160)". Rearranging the fraction, as you did (i.e., (a/b)/(c/d) rearranged to (a/c)/(b/d)) yields the exact same answer (OR=1.2)

[@walkaboutinside]

I am a Psychiatry trainee and I have to say your explanation and drawings are spot on. Kudos to you.

[@MrsUniter]

Preparing for anesthesiology boards, going back to your videos to review the basics of biostats! Your videos are gold!!

[@RandyNeilMD]

Glad they are still helpful... You are much closer to the finish line.

[@kalpanagosai1709]

Don’t tell me they have this in boards too? So done with ethics and biostats…as if having them in USMLE wasn’t enough, they have this in boards too🥹🤨😟

[@shisuiuchiha-h3h]

once again i'm here for the bestestttttt biostats teacher ever for my step 2 CK. done with step1, highly recomment Randy Neil, MD. i literally can't stress it enough how important it is to watch and understand his videos.

[@RandyNeilMD]

Appreciate the kind words!

[@elizabethzhang68]

Taking STEP tomorrow morning, so grateful for this video!

[@RandyNeilMD]

Did you survive?

[@ceph-azolin6763]

I am an IMG, the first thing I am gonna do is to meet you and appreciate your work. GOVERNOR OF BIOSTATS

[@RandyNeilMD]

We shall share a drink after you get into residency....

[@ceph-azolin6763]

@@RandyNeilMD Will be my best day of life, deal done :')

[@moseebalihashim3433]

Never seen such a simplified and comprehensive lecture of biostat.

[@RandyNeilMD]

Moseeb, Thank you for taking time to comment.

[@medicooo3884]

You are always so calm. I am going through your videos and noticing how peaceful he seems❤❤

[@abdallahjlambo3404]

When I watched you are videos the first idea pop into my head was (Please, we need more and more) do not hold back these informative quick reviews.

[@RandyNeilMD]

Thank you Abdallah. I will continue to make more. As long as you tell me they are helpful.

[@asivz27]

i remember watching the original vids a few years ago and thinking you were an attending. wild that you were just beginning residency at the time; so impressive! thanks for all the hard work you do!

[@RandyNeilMD]

Time flies... Glad videos were/are helpful...

[@DrAsadN]

Watching this 2 hours before step 1. You’re the goat Dr. Neil 💪🏻

[@RandyNeilMD]

Went well? Keep me posted.

[@DrAsadN]

passed :) thanks for all your biostats help Dr. Neil 🫡💪🏻💪🏻

[@davidolsen865]

Hi Dr. Neil just wanted to thank you once again for all of your amazing videos and excellent advice. Your biostat videos helped me immensely when preparing for Step 3 and now I'm matched at my #1 choice and about to begin residency July 1st! You are the best of the KZbin medical educational video instructors.

[@SN-qt8zk]

Your biostats videos are literally a godsend. I can't thank you enough.

[@RandyNeilMD]

Thank you for kind words.

[@MaryloP.B]

Mille merci Dr Neil ! Thank you so much! I really struggled with biostats, your teaching skills made it so easy to look at these questions with a calm mind and more confidence!

[@RandyNeilMD]

Glad it was helpful! Keep me posted on your progress and testing...

[@MaryloP.B]

@@RandyNeilMDwill surely do. Thanks again

[@dr.karthikkmurali3229]

Hello, Dr. Neil. Thank you for your videos, really inspiring how these questions can be mastered simply.

[@coohsaidthepigeon6709]

Thank you for this! Always hear your explanations in my head when I’m solving “sensitivity is down, the compare is our division sign…”

[@RandyNeilMD]

Glad it is helpful... It WILL work on all exams.

[@Manuel78]

No tengo palabras para agradecer videos como estos. Gracias, muchas gracias.

[@salamalvi3690]

Thank you. Used it for my first day of step 3 and it came in clutch.

[@RandyNeilMD]

Such a good feeling to have confidence with certain questions!

[@shahzaibkhan6242]

Sir in the Question explained from 21:08 to 22:40 they have grouped the students on the basis of independent variables(age) so this should be a Cohort study not a case control and hence the next Question should ask about Relative risk not odds ratio bye the way you are great sir thank you

[@dilyskc3176]

Agree

[@TheAnisa123456]

Thank you so much, Dr. Randy. You are the GOAT of Biostat and ethics indeed!

[@RandyNeilMD]

You are most welcome

[@dr.insitu6455]

CAN NEVER GET ENOUGH OF BIOSTATS REVIEW LOL...GOD BLESS AND THANK YOU !!

[@RandyNeilMD]

Dr. Insitu, Glad it has been helpful...!!

[@edgarmandeng]

This is the best biostat review I have seen

[@aroobaramzanmalikkhan6105]

Sir , thank you so much for all the quality work you have done.

[@RandyNeilMD]

You are most welcome.

[@harvey2733]

dr neil is the best...i struggled with biostats and ethics in step-1. dr neil's channel is a blessing. thank u sir

[@RandyNeilMD]

Thank you Suraj

[@manux041]

In last question about the Odss Ratio, the answer should be (60/200)/ (40/160), why is it option C? And in the question about the RR about the prostate cancer The formula you wrote is (a/a+b)/ (c/c+d) 15:43 and because "first on top" it goes backwards, (c/c+d)/(a/a+b), but still, the process you followed was (b/b+d)/ (a/a+c)... im confused

[@anafinke9702]

Pretty sure in the last question it's a mistake!

[@adedayoadeleke2790]

I am sooooo grateful for you this Thanksgiving! God bless you sir!

[@OkanVKILIC]

i really appreciate your work Dr.Neil, biostatistics was my nightmare before watching your videos. Now i can approach with a confidence to the questions thanks to you.

[@RandyNeilMD]

Okan, That is very good to hear... CONFIDENCE IS KEY!!

[@kalpanagosai1709]

Sir u r the best when it comes to biostats and ethics…this channel has all the credits for clearing biostats and ethics in usmle step 1 & 2😍😍😍😍

[@RandyNeilMD]

Thank you Kalpana. I'm hoping we are removing the fear for those topics...

[@christinechilinga7608]

You're absolutely uh-mazing!! I literally don't know what i would have done without your biostats vids!!

[@RandyNeilMD]

Christine, Thank you for taking time to comment. Glad the videos have been helpful.

[@priyam1550]

This is gold! Thank you thank you thank you! I am no longer afraid of biostats!

[@RandyNeilMD]

CRUSH IT.

[@tahreemsheikh7582]

Got my ADAT in 2 days. You've got my stats covered. Thank you and god bless!

[@RandyNeilMD]

Hope it went well... Please keep me posted.

[@user-xx7ed7ti1z]

I just can't seem to get enough of your videos! Never in a thousand years would I have thought I love biostatistics. Thank you, thank you, thank you 😊

[@RandyNeilMD]

Make it your STRENGTH!!

[@MedsInfoDrAzmIshaque]

Sir you have done amazing videos and I have passed my pharmacy board exam .Thank you so much for this great efforts

[@RandyNeilMD]

CONGRATULATIONS!! Enjoy the moment...

[@shaziaali2588]

thankyou for existing and making our lives better lovee from Pakistan

[@RandyNeilMD]

You are welcome from Gulf Breeze, Florida.

[@Dr.8zaz4168]

U R AMAZING DR.Neil , really appreciate your help for us in this journey

[@RandyNeilMD]

Glad it is helpful.

[@bernardroscoe1059]

Prepping for Family Medicine Boards, appreciated your assistance through all the Steps to get here.

[@RandyNeilMD]

Absolutely. Glad it has been helpful.

[@princessz5087]

Great review video. Thank you so much Dr. Neil. The BEST Behavior Science & Biostatistics Channel

[@RandyNeilMD]

Princess, You definitely make me feel good about what we are doing... Thank you.

[@luislemus5144]

Just 2 weeks from my test, awesome video like always. Thanks for the knowledge.

[@RandyNeilMD]

Luis, The HOME STRETCH... stay confident... STAY STRONG!!

[@ankitaojha854]

Thankful that you exist!!

[@RandyNeilMD]

Ankita, Thank you...!!

[@matthewzahn8241]

Visited this video for step 1 now coming back for step 2. Thanks for this great video👌

[@markonemet3400]

Thank you for your help Dr Neil! Just one question. On 22:10 you said it is a case control study. I think it is a retrospective cohort since we can look at low USMLE scores as a disease. So if we have two groups, one with a risk factor for low score (being older) and one without the risk (being younger) and we look retrospectively to see if they had low scores ('a disease') then I would consider it a cohort study. It is similar to observing if smokers and non-smokers developed COPD or SCLC. If it was a case control, we would have a group with low scores (a disease) and a group without low scores (no disease) and then we would look if they were exposed to a risk factor such as an old age. Please correct me if I'm wrong.

[@healingstation3921]

I agree

[@christiansmith7391]

Also agree

[@kristenwalt3688]

That is what the table indicates, a group of low score vs a group with no low score and they're studying how many people were older than 50 in both groups and what are the odds of you getting a low score if you're older then 50. Note the text in the question gives incomplete information, the table explained it better.

[@danieldonascimentoaraujo3221]

Great, short and succinct. Thank you, Prof Randy! Amazing Video for Step 2 CK!

[@RandyNeilMD]

Thank you

[@maryjadaiva4945]

thank you so much,i dont know how to stress it out!!! ,you are ...!!(no word ,really NO WORD can describe you),GOD bless you.

[@RandyNeilMD]

Thank you Mary... Keep me posted on your progress!!

[@poojapatwal6525]

My step 3 is tomorrow . Thank you so much.

[@RandyNeilMD]

I hope you CRUSHED it... !!!

[@hazazihazazi4204]

so excited had to comment before watching. THANK Dr Randy.

[@RandyNeilMD]

Hazazi, Thank you for the support and kindness...!!

[@mernaelnosiry9672]

I really appreciate your effort, Dr. Thank you is not enough !

[@RandyNeilMD]

Glad it was helpful.

[@amirsanatkar1785]

Dr. Neil, it was fantastic.

[@RandyNeilMD]

Amir, Glad it was helpful!!

[@hmooda1311]

Thank you very much for your videos. For the Odds Ratio question, the answer C should be 60/200 / 40/160?

[@katherineruiz8935]

Thank you Dr Neil ... You are the best !!!

[@RandyNeilMD]

Katherine, I am humbled by your comment...

[@nnamdi3625]

Biostatistics made easy. Thank you Dr. Neil.

[@RandyNeilMD]

Nnandi, Thank you for taking time to comment.

[@ML-zb7gq]

Going through my last quick review. This has been GOLDEN! Ready to get those questions. Thank you!.

[@mohamedaly6704]

Quick and to the point. Great job once again Dr Neil, thank you!

[@RandyNeilMD]

Mohamed, Thank you for commenting. Keep studying HARD!!

[@morganlucas9062]

you're really marvelous and such a humble and calming force. Thankyou.

[@RandyNeilMD]

Thank you Morgan. Appreciate your kind words.

[@hinnahraza7978]

God bless you Dr Neil.

[@RandyNeilMD]

Hinnah, You are most welcome. :)

[@ryanh.nguyenmd5357]

Excellent, Dr Neil. Thank you so much

[@RandyNeilMD]

Ryan, You are most welcome.

[@talhaasif3820]

exam due in a really short time and you're a saver for sure! Can't thank you enough!

[@manaral-masri5054]

Thank you so much for your incredible effort! Would you please give me a simple explanation why the study in min 21:11 is not cohort ? We started with 2 groups without knowing what the results were, then went retrospectively in order to know the results. Thanks again

[@Moifyy]

Thanks so much Dr. Neil for simplifying biostatistics and making it much easier to understand! ❤️

[@RandyNeilMD]

You are most welcome... Much more to cover... I'm working on it.

[@Moifyy]

I’m so glad I binged watched the biostatistics videos yesterday! They really helped on my exam today. God bless you 🙏🏽

[@RandyNeilMD]

@@Moifyy PERFECTION!!

[@Piinkstar17]

BLESS YOU FOR THIS DOCTOR. seriously. THANK GOD i found your videos

[@RandyNeilMD]

Thank you. Glad it was helpful.

[@dailydoseofmedicinee]

Thanks Dr. Neil

[@RandyNeilMD]

DDoM, You are most welcome.

[@saratalha926]

Dr you made a very hard subject easy and understandable, I really appreciate your efforts. many thanks.

[@RandyNeilMD]

Sara, You are most welcome.

[@georgettemoubarak1643]

In the last question the divided one number (60) by one number (200) over one number (40) divided by 2 numbers (40+160) ie (A/B)/(C/C+D) isn't the OR supposed to be (AxD)/(CxB) which would be answer choice A?

[@RandyNeilMD]

I'll have to relook... Case control (odds ratio) 1 number over 1 number... Cohort (relative risk) 1 number over 2.

[@georgettemoubarak1643]

@@RandyNeilMD Yes! my point exactly. Would love to have feedback about the correct answer.

[@celenevaldez1579]

I have the same doubt too! C. (60/200) / (40/ (40+60)) ; 1 number over 2

[@dr.insitu6455]

@24:35 the odds ratio answer should be ((60/200)/(40/160)) just a negligible error on the paper

[@blazor28]

Mad respect for you my man. Hoping to match this season so I can thank you in person someday haha

[@monkiman4891]

Great review of questions...piece of cake 🍰 Thanks Doc🙌🏻

[@RandyNeilMD]

Perfect.

[@RJ-rd4if]

Thank you for this. Dr Neil, any chance of future videos on interviews tips and tricks?

[@RandyNeilMD]

RJ, I'm always trying to incorporate some tips and tricks... Thank you for the reminder...

[@ShobitaA]

thank you for these videos !god bless you!!!

[@RandyNeilMD]

You are most welcome!

[@arizonablossom8635]

Thank you for all your efforts,sir.

[@RandyNeilMD]

A B, You are most welcome and I appreciate your support with the feedback...

[@reigningrita3548]

For the problem at 13:48, why don't we consider the true positives and true negatives? Because to me, every number is getting smaller, TN/TP/FN/FP. So just logistically, I would have said nothing changes. Because the numerator got small as the denominator got small as well.

[@SyedAhmed-ll2jg]

Great review Dr. Neil! Can you do a similar quick review for Psych.. That'll be extremely helpful.

[@RandyNeilMD]

Syed, Quick review for Psych should be easy...

[@karinadinglasan8711]

Dr. Neil thank u for ur videos, u are a big help to understanding biostats!😊

[@RandyNeilMD]

Karina, Thank you for commenting. Glad it was helpful.

[@shalinisharma4896]

So thankful for your videos!!!

[@RandyNeilMD]

You are welcome. Keep me posted on your progress..

[@narjismumtaz240]

thank you Dr Neil.

[@RandyNeilMD]

You are most welcome.

[@sarahsprepforusmle645]

Is truly have no disease = no disease( FP +TN) Or TN only. That confused me in one of the questions.Please explain Dr. Neil. Thanks for your help!

[@RandyNeilMD]

A little hard to understand in typed words...

[@fereshtahkhoshbakht1999]

Thank you so much ,as always great and useful.Please make videos for respiratory physiology

[@RandyNeilMD]

Fereshtah, Respiratory wasn't my Favorite, but I'll eventually get to that topic...

[@fereshtahkhoshbakht1999]

@@RandyNeilMD thank you ☺️

[@abbyyoss9349]

what video has the initial specifications of how to approach sensitivity, specificity, PPV, NPV like in the question at the 5:40 mark?

[@chetanreddycds]

Dr Randy thank you for this video :)

[@RandyNeilMD]

Thank you Chetan!!

[@chetanreddycds]

@@RandyNeilMD Dr Randy was doing your videos day long :) thank you for being motivational figure to us :)

[@lokyan5362]

Great Teacher! Thanks for the video

[@RandyNeilMD]

Lokya, Thank you for the first question..!!

[@SomayehHashemi-wk8df]

thank you so much for that helpfully . I HAVE A QUATION: if they said ; increase healthy people what happen? is it standard error increased but upper interval increase and lower interval decrease ? anyway thank you so much

[@Drfauzanosman68]

You the best Doc. Thanks

[@RandyNeilMD]

Fauzan, Thank you...

[@marinaishak1609]

Thank you Dr for this video it is so helpful

[@RandyNeilMD]

Marina, Glad it was helpful.

[@enasalgharably5989]

thank for beautiful explanation, but how can i get the old videos about OR,RR AR& ARR?

[@RandyNeilMD]

The videos should be out there...

[@Sophia-ms1xj]

Thank you so much from the bottom of my STEP 2 studying heart!

[@RandyNeilMD]

I look forward to you updating saying you are now studying for STEP 3...

[@hoorulainahmed3670]

Thank you for these videos! So helpful! Can you please do a video on Bradford hill criteria as well? So confused

[@pottabathinirahul7609]

Great explanation doctor Thanks a lot 💓 Keep doing more videos on both biostat and ethics

[@RandyNeilMD]

Pott, Glad you found it helpful... I'll keep trying to add stuff that is useful... Thank you for the feedback...

[@ramshaali190]

All i wanna say is you're the best!🧡

[@bushraghafoor242]

thanks alot Dr Neil, ur videos are blessing for me

[@bushraghafoor242]

can u please clear a point.. if power goes up what will happen to type 1 error. type 2 error will decrease, its a uw ques n this point confuses me alot

[@RandyNeilMD]

Off hand... If power goes up (number of people)... then the chance of something happening "by chance" seems like it should decrease (ie. P-value should decrease)

[@fluorescentmug8333]

Question about the question at 24 minutes. Why for the Odd ratio answer is the denominator 40/(40+160) should it not just be 40/160?

[@mohammadkhakinahad8711]

hi thanks. in last q there should be 40/160 not 40/160+40

[@rafii1093]

Dr. Neil, I apologize if you have answered this question already. But are you planning on doing Biostats videos for Step-2CK by any chance?

[@RandyNeilMD]

Rafi, It has been my experience and understanding that the BIOSTATS videos here should be good enough for STAP 1, 2, & 3.

[@rafii1093]

Thank you Dr. Neil. I really appreciate you getting back to me. The sole reason I got through Step-1 Biostats (recently) was because of your videos. Looking forward to rewatching and reviewing them again for Step-2. Pls add some more Step-2CK materials (various topics) if you have the chance. Thank you.

[@MedsInfoDrAzmIshaque]

I really wait for your videos

[@RandyNeilMD]

Thank you for the kind words. I plan to restart soon...

[@MedsInfoDrAzmIshaque]

@@RandyNeilMD 🙏🌸🌸🌸

[@dr.p2992]

Thanks again for such good content! I took Step 2 this morning and listened to this review again on my way to the exam site, it really helped me with a few questions! Also, the Drug Ad video was invaluable! Do you have anything planned for Step 3?

[@RandyNeilMD]

Glad it was helpful. The biostats will cary over to STEP3...it's roughly all the same. Maybe an additional drug ad...

[@drsandipchaudhari8636]

@24:29 Answer C should not be 60/200 divided by 40/160?

[@nevmitch2]

Hi Dr. Neil why is that you inverted the calculations of RR for this question?? 15:00 it was to my understanding that "exposed / unexposed quotient" was the way of thinking of RR i had to redraw the table for this question too....HELP thanks in advance

[@RandyNeilMD]

I would always work problems and "whatever they mentioned first goes on top"... This takes us away from trying to memorize it... If you do it this way you'll always be right, even if they switch it up on you....

[@jboi8878]

am I tripping or at 24:00 isn't C still incorrect because the second half of the question includes 40 in the denominator? shouldn't it be (40/160) instead of (40/(40+160)) ? thank you for your videos they are incredibly helpful!