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Biostatistics SUMMARY STEP 1 - The Basics USMLE

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Review of the most common types of questions commonly seen on STEP 1. Review the teaching videos from Dallas for more in depth explanation. These are the minimum basics, there is more material that is fair game for the test, but you can "hold your own" with this material Randy Neil, MD Psychiatry Resident, Hennepin County Medical Center, Minneapolis, MN
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Текстовые комментарии (551)
Spicy Mocha (1 день назад)
13:40 would A and B also be 100% sensitivity?
JewelsOfOctober (5 дней назад)
For question at 23:48, I think the answer may be incorrect as mentioned by someone else earlier. Please someone correct me if I'm wrong. If you label the table as in FA, with prostate cancer (disease-D) on top and having children (risk factor-RF) on the left, the way I remember it to always label it correctly within the table is: A= positive D, positive RF (++); B=negative D, positive RF(-- +) C=positive D, negative RF(+ --) D=negative D, negative RF(-- --) So in this table A=220, B=1280, C=80, D=920 RR= A/A+B//C/C+D=220/1500//80/1000=1.36; I think the answer should be 1.36. Let me know what you think... Otherwise many thanks to Dr Neil for this wonderful video, I've learned so much from it, everything is explained so well, thank you !!
I Khan (12 дней назад)
Amazing ! Thank You !
Hassan Aziz (15 дней назад)
Amazing lecture
Anthony DeGennaro (17 дней назад)
thank youuu
Thugbert0 (18 дней назад)
Wow! Thank you.
Jasmine Robinson (20 дней назад)
Great Video!
Jenny Marie (22 дня назад)
Thank you Dr. Neil for these amazing videos!! I take step 1 in 10 days, and somehow I’m actually confident with biostats thanks to you :) And thank you for emailing me your notes!!
Jose Gallardo (22 дня назад)
Dude, holy shit. Just within the first 3 minutes I learned so much!
Frank MD (22 дня назад)
Thank you a million times! You've made these complexities so awesomely simple to understand. Than you again!
chyakhurs chyaks (28 дней назад)
I am so lost because of these simple calculations. Seems like i have to go back to my priliminary school to study basic calculation again. Calculation makes me scratch my head.
katayoun kh (1 месяц назад)
It was awsome.thanks
chahinez laidli (1 месяц назад)
Thank you so much! After some struggle with biostat, I finally get biostat and I am so happy! :)
Krystal Hasel (1 месяц назад)
bless you!
Tim Lee (1 месяц назад)
@ 6:48 I thought it was cross sectional because there is no time issue here and it's just seeing 2 groups. I'm kinda confused. Any help appreciated
C (1 месяц назад)
Thank you, this was amazing!
Lotus Bee (1 месяц назад)
Lord help me !
Low pH (1 месяц назад)
High yeild
Adil Sarfraz (1 месяц назад)
This was really helpful, made the concepts much simpler and easier to understand :D
IHIKKI HANANE (1 месяц назад)
I am thankful to find out ur video, it s very simple and clear, it makes everything eaiser.... thank u Sir :) :)
000joi (1 месяц назад)
Thank you! They are truly helpful to help understand and memorize stat!! (mainly for step 1 lol)
K M (1 месяц назад)
This is great!! Thank you very much for sharing the notes. This is definitely helped me in my studies!
Meagan Acevedo (1 месяц назад)
Dr. Neil, thank you so very much! These videos are amazing!
Calvin Le (1 месяц назад)
Loved these videos, currently preparing for boards and they have been a life saver!
Steve Marabondo (1 месяц назад)
This is gold! Dr. Neil is a great teacher who succinctly and effectively simplified a very confusing subject. Can’t recommend enough!
Dr.Praneetha Modumudi (2 месяца назад)
Thank u so much ! U r awesome
NI Rakib (2 месяца назад)
these videos are soooo goood and to the point. i even recommended them to some test takers.You are helping out many examinee God bless you.
Justin Hills (2 месяца назад)
Dr. Neil's biostatistics review videos are an absolute must-watch for Step 1 studying! These lectures will give you an approach that you can consistently use to answer questions correctly. Forever grateful!
Arbaaz Rao (2 месяца назад)
I went and did a block of UWorld focusing on Biostats right after watching this video and its subsequent video (Part 2). It was SUPER reflective of all the questions he just did, I applied the same techniques taught by Dr. Neil and was rocking those questions. Watching the two videos, that are about an hour long, completely overpowered the endless hours I've spent studying Biostats from Kaplan as well as First Aid. Oh and by the way, he replied to my email right away and sent his notes. Wish I could give these videos a million thumbs up.
shamille724 (2 месяца назад)
Great mnemonics.... thanks for the video!!
Saranyan Senthelal (2 месяца назад)
Dr. Neil sent me notes! HIGH YIELD
MOHAMMED AHMED (2 месяца назад)
why the study is case control ? I didn't get it
sadaf mirkarimi (2 месяца назад)
for sure,it is the best video I have seen on Youtube. awfully good
N-Jay Productions (2 месяца назад)
thank you for the notes. You made Biostatistics so easy to grasp! Hope to see some more videos on your channel.
Ruby Singh (2 месяца назад)
Thank you so so much! The concepts were so difficult to get before I found this video.. :)
Tony Dinicola (3 месяца назад)
I love your explanations :) Can you make videos for step2ck and step 3? :) Awesome Doc!
Randy Neil, MD (3 месяца назад)
If you watch both videos, it will get you past Steps 1,2,&3.
Ravindra Kodali (3 месяца назад)
Great Just have one small comment, 14.33 min question should be E no change as when the curves are moved down both TP and TN also went down proportionately so the total effect cancels out. Making the answer E
Michael Kerr (3 месяца назад)
Is it possible to get a copy of the questions so we can annotate and do them "with you" ?
Zembaphobia (3 месяца назад)
Rashmikant Yadav (3 месяца назад)
Extremely brilliant.
dr.sadaf alam (3 месяца назад)
Sir i think ur's is the best lecture in high yield topics....hence i have recommended ur videos to medical students in my medical lecture review for biostatistics ...https://www.youtube.com/watch?v=OoFknuzmcsw&t=1s ... great work sir....!
Randy Neil, MD (3 месяца назад)
Thanks for the compliment... hopefully biostats will be the easiest section in exam
Trent Johnson (3 месяца назад)
this is an amazing video! I understand things a lot more because of your quick associations. It'd be great if you could post a pdf of the examples. Thanks a lot
Adilia Morales (3 месяца назад)
Thank you so much. you made it so simple. best video!!!!!!
Nadia Khan (3 месяца назад)
Randy can you explain if only sensitivity, specificity and prevalence is given. And they want you to get TP to FP ratio. How do you get this?? If no population size was given how can we tackle this?
keyser_soze (4 месяца назад)
Thank you
Anabel Ruiz (4 месяца назад)
Thanks randy
Degraaafschap (4 месяца назад)
William Jebril (4 месяца назад)
Just received the notes... will be interesting to see what I can accomplish with it.. I will return for a review. Thanks! Videos are great!
Erick Goris (5 месяцев назад)
This is the best Biostats teaching video I have ever seen! I have literally watched it over 20 times! THANK YOU SO MUCH!
anna guleena (5 месяцев назад)
You are amazing......magically amazing
medschool 1990 (5 месяцев назад)
Sir you should be called Pathoma of Biostats haha , awesome job !
Martin Schlusselberg (5 месяцев назад)
Gifted educator. Well done.
Emad Atassi (5 месяцев назад)
best biostat USMLE video ever. everything is clear and easy. thank you very much. you just made my life easier.
wasek talukder (6 месяцев назад)
i will specially thank you for the shortcut on CUT oFF value question. You saved a lot of times.
paradiseheaven (6 месяцев назад)
Medically_High (6 месяцев назад)
i'm half way through the vid.... and mannnn i LOVE u for this... u r the best.. my step 1 is in few days.. and i'm doing my final revisions... and i needed this quick source for tackling the high yield stuff.... i wish u all the best
Paul Awad (6 месяцев назад)
super high yield. great idea to actually work us through the problems as u explain. 10/10 explanation. not to mention, easy personality to follow along :) 10/10 video. believe me if i could press LOVE on this video i would. thank u so so so so so much great doctor!!! :)
Randy Neil, MD (6 месяцев назад)
Appreciate the kind words
Moises Lutwak (6 месяцев назад)
Amazing, thank you
Arshi Khan (6 месяцев назад)
Thank you very much Dr.Randy for your time .very nice and helpful videos. very clear concept. I also got my notes from you. you are really very good person. 5 stars for videos.
srikanth adidam venkata (6 месяцев назад)
Love ur pen
su ni (6 месяцев назад)
Thank yu so much sir gbu
Nausheen Khan (6 месяцев назад)
Martin MARTINS (6 месяцев назад)
Boy o boy! The proof of the pudding is in the eating.Thanks for efforts you have put to study this.
Gilmar Costa (6 месяцев назад)
this video actually saved my life!
Arshad Sethar (6 месяцев назад)
dear Randy you are simply the best thanks a lot u simplified the world to me
Gau Patel (6 месяцев назад)
Dr. Neil is the MAN! Thank you for taking this extremely dry topic and making it easy. I've studied it for step 1 and step 2 and could not bear to do it again for step 3 but his approach has brought much needed relief. Also very impressed with his response to my request for a copy of the notes as he is no doubt busy with residency. Thanks again, doc!
ionthegravity2 (7 месяцев назад)
Dr. Punerdeep Sidhu (7 месяцев назад)
This 30 minute video covers 95% of the biostats you WILL see on USMLE Step 1 :)
Miguel Melo Duarte (7 месяцев назад)
Dude, you are awesome !!!!!!
T Nugod (7 месяцев назад)
I am so thankful.
Hamza Iqbal (7 месяцев назад)
You just made something really dry into something really interesting. Thank you.
Andrea Jaramillo (8 месяцев назад)
Thank you Dr. Neil!!! Your videos are amazing. I am finally getting all the Stats questions right. Also Thank you so much for your notes and Encouragement!!
axoni style (8 месяцев назад)
everytime I watch this I feel so happy
Riffat Alam (8 месяцев назад)
awesome stuff! just what I need before my Canadian licensing exam. Just the last question wasn't too clear. I ll look into my past notes for that. Cheers!!!
Sharon S. (8 месяцев назад)
Thank you so much for the explanation!!! You made it clear and hopefully enough for STEP 1!!!
dradisuliman (8 месяцев назад)
thank you very much greatest video i have ever seen
Dan Iducovich (8 месяцев назад)
Isn't it more typical to "control" for "age" through "matching" rather than see it as a "disease" or even an "exposure"? But if age is often an "exposure" or a "condition" for USMLE purpose... I woudn't doubt that the exam, itself, would be purposively confusing in this way, and at "cross-purposes" to a sensible study design.... But, I was a philosophy major in undergrad, not "premedical", so I understand statistics a little differently than what a new generation sees in statistics... I don't know... (which FYI, is not a reference to Epistimology) https://onlinecourses.science.psu.edu/stat507/node/48
Muhammad Awais (8 месяцев назад)
why in the question with old graduates answer is not cross sectional study? its at 5:57
Sarah Cormie (9 месяцев назад)
WOW! Fantastic, thank you SO MUCH!
ThinkerBee (9 месяцев назад)
Thank you again for your time and posting this video, Dr. Neil!!! You're awesome!
dhruval patel (9 месяцев назад)
Case fatality rate should b 4/24 as in u world...
SAM (10 месяцев назад)
Instead of Just shouting thanku ,love u ,BLAH BLAH…..its better donate his channel ,U REALLY DESERVE BRO……..wat a gem of information,keep it up……GUD LUCK
Muthu (10 месяцев назад)
You made statistics very easy . Thanks !
Vicky Loutsou (10 месяцев назад)
Dude, You are AWESOME !!
january star (10 месяцев назад)
thank u sooooooooooooo sooooooooooo much u r awesome:)
Lardo Brow (10 месяцев назад)
Quick question! When you talked about correlation you said that a lower correlation would mean a change in slope? What idd you mean by that? Should we be looking at slope or how well the line fits the data points?
Enanyeli Rangel (10 месяцев назад)
But greater would have been more than 240... I don't understand why ends up been 5.... I'm Still confuse with the GREATER?????
Enanyeli Rangel (8 месяцев назад)
Thank you so much for the taking the time to answer... it was indeed helpfull @Muaad Atef
Muaad Atef (9 месяцев назад)
Yes, all the values above 240 would make only 5% of the sample given . since the mean is 210 , and the standard deviation was 15 , therefore one standard deviation above the mean would be 210+15= 225 and two standards deviations above the mean would be 240 , now heres the concept : if you take the mean of the sample and added 2 standard deviation you get 95% of the sample , the remaining would be 5% . the question is asking how many people would be higher than 240 ( in other words higher than 2 standard deviations ) since we know that anything above 240 would be more than 2 standard deviations , this means we want the 5% which isn't included in the ( cause it's above 240) , so 5% of 200 people would equal 10 . now last thing to know is that those 10 include ALL the 5% of the sample ( above and below the mean ) , but we only want the ones above the mean so we divide by half and the answer is 5 . hope it helps .
r c (10 месяцев назад)
the problem about relative risk about the guys who have children over those that don't...I'm confused. You are saying you are using R.R formula but changing the way its used bc the problem states to compare those that don't have vs those that have. You proceed to plug in the #'s but, and this is where i get confused, instead of using the formula: (A/A+B) / (C/C+D) it goes more like a fused odd ratio RR formula: (B/B+D) / (A/A+C). Wouldn't it be: B/B+A / D/D+C ?
Randy Neil, MD (10 месяцев назад)
The "key" to these problems and mastering this concept is to understand that you don't want to memorize the formula...because if they (USMLE) change the question you will get it wrong.  It is best to put "whatever they say first" on top and "whatever they say last" on bottom...  This will work everytime and keep you away from the trap.  Hard to say over words...  Trust me...it will work every time ... Once you have the "A'ha" moment you can come back here and explain it...to others.
r c (10 месяцев назад)
btw, you should monetize this vid, its really good.
Fauzia Rauf (10 месяцев назад)
Thank you soo much every time I watch it I learn new stuff.
Randy Neil, MD (10 месяцев назад)
Good deal... now time to put Step1 behind you
Enanyeli Rangel (10 месяцев назад)
Thank you sooooo much for taking the time to make this video. Super simple, super short SUPER helpfull !!!!!!!!
Anabel Ruiz (10 месяцев назад)
hey Randy 2017, and this video is still pure gold !!thanks a lot
Jose Diaz (10 месяцев назад)
Errata: 13:06, the question's answer is A, B, or C for 100% sensitivity, since False Positives dont matter in Sensitivitiy
Priya Udayappan (10 месяцев назад)
Thank you for your videos Dr.Neil- you have biostatistics approachable and simple :)
Randy Neil, MD (10 месяцев назад)
Glad it was helpful
Komal Malik (10 месяцев назад)
I looked around for so long and could not find any resource that would clear my queries regarding biostats until a friend send me the link to this. I have to say your videos are such a life saver! your teaching style is unmatchable.. yes!!! like they are saying you are the pathoma guy of statistics couldn't have said it better! Thank you!
Randy Neil, MD (10 месяцев назад)
Thanks for the feedback!!
Saurabh Varma (10 месяцев назад)
God sent!
xXEnchantedStringsXx (10 месяцев назад)
I've only taken the Intro to Epidemiology course so I learned the basics of how to calculate TP and TF, but I have a much clearer understanding of the concepts I learned in that class, thanks to your videos!!
Randy Neil, MD (10 месяцев назад)
Good to hear the feedback
Jere Mias (10 месяцев назад)
Ok I am still confused. At 23:48, Relative Risk in first aid is (A/A+B) / (C/C+D). I understand it is NO CHILDREN but he is doing (B/B+D) / (A/A+C)? Or am I missing something here. Does prostate cancer go on top if you want to use first aids method?
JewelsOfOctober (5 дней назад)
Yes I think this answer may be incorrect. If you label the table as in FA, with prostate cancer (disease-D) on top and having children (risk factor-RF) on the left, the way I remember it to always label it correctly within the table is: A= positive D, positive RF (++); B=negative D, positive RF(-- +) C=positive D, negative RF(+ --) D=negative D, negative RF(-- --) So in this table A=220, B=1280, C=80, D=920 RR= A/A+B//C/C+D=220/1500//80/1000=1.36; I think the answer should be 1.36. Please someone correct me if I'm wrong. Otherwise many thanks to Dr Neil for this wonderful video, I've learned so much from it, everything is explained so well !!
sadaf mirkarimi (2 месяца назад)
ya ,i have the same problem
Zainab Alam (2 месяца назад)
i was literally thinking the same! did you figure it out? Please let me know!
Jere Mias (10 месяцев назад)
I flipped it to where prostate cancer is on top and it just confuses me even more lol
Divya Choudhary (10 месяцев назад)
This is amazing.. thanks a ton really for making this video..🙂
Randy Neil, MD (10 месяцев назад)
Glad it was helpful
Prajay Rathore (10 месяцев назад)
Its very useful for boards prep. I can't imagine doing biostats without it. I would definitely recommend to all of my friends and collague. Thank you Dr. Neil.
Mahmudur Rahman (11 месяцев назад)
Literally the best educational video I have seen!
Randy Neil, MD (10 месяцев назад)
Thanks for the nice comment

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