What is a p-value?

Demystifying one of the trickiest concepts from statistics: p-values!
This video is part 1. Find parts 2+3 here:
bit.ly/quaesita...
Same topic in blog form: bit.ly/quaesita...
My other articles to help you understand some of the preamble:
How do you form a null hypothesis? bit.ly/quaesita...
What's the main idea behind hypothesis testing?
bit.ly/quaesita...
All of statistics in 8min:
bit.ly/quaesita...

[@technicalmachine1671]

Oh, it's a puppy value. Got it now

[@naevan1]

4 years of math degree and i've never heard a better explanation. thanks

[@haejinl463]

I sat down for 2 hours reading/watching about p-value thinking how this is so counter intuitive...then I watched your video...EVERYTHING MAKES SENSE! You're my hero (and Fido)!!

[@ewhulbert]

This is fantastic, please continue this series. Also, I have an 8 year old and you are correct, the entropy increases dramatically.

[@omarnasser9065]

i think many people wont realize actually how brilliant u explained ... thank u

[@timhoward6742]

you're right. I still don't understand

[@travel.tales.official]

Albert Einstein had it right: “Education is not the learning of facts, but the training of the mind to think.” And this series prove it. Keep it on. I would like to learn how to think.

[@kartikkalia01]

NERD!!!

[@travel.tales.official]

@@kartikkalia01 You are goddamn right

[@vanshikabharti2543]

I will never forget this concept now! You made it so easy Thank you ❤

[@cementhaiku]

I have no formal education but that's only because the Grateful Dead used to tour. Now that they're long retired I have a bit more free time to flail about in many advanced fields. What I've discovered is there are certain teachers that can make the most fascinating, mind blowing subjects as engaging as watching paint dry. Then there are teachers that can take a subject that, at first glance, has the appeal of eating mouthfuls of dirt, but after a few moments you realize you're gripped with increasing excitement. You are the latter. I know I'm late to your channel and blog, but I hope you continue on. You are very helpful, illuminating and funny! You had me at puppies but I lost it at "8 year old are evil." Who woulda thunk statistics could be so fun? THANK YOU.

[@yuryhrytsuk4560]

Simply incredible. I can't find words to express how I am grateful for this explanation!

[@davidduranp]

Hi Cassie, greetings from Dominican Republic. Great video, a lot of people struggle to understand some stats concepts, but then someone like you show us the light at the end of the road. We really appreciate your effort. Ah and the next time we run out of cookies, i´m going to applied p-value, but guess what? P-Value=my 4 year son. see you...

[@michal9775]

Thank you :-) You're always a true inspiration. It's clear you're new on YT, but please, keep going and polish the videos you're providing. Your previous articles were amazing. Please translate them into video lectures and build your brand here as true decision scientist. This is gonna be a revolution! :-)

[@shauryasingh9553]

OOOHHH MY GOOODDD..... I have been trying to understand p-values for such a long time but I was not able to!! THIS IS A BRILLIANT EXPLANATION

[@madabhushichari6808]

So clearly explained. Never fully understood the explanation even in "reputed" books. Thanks!

[@modakad]

Wow !! What an simple way to make even a newbie understand what's p value ! And the way you've described, it also allows the educated audience to infer that the magic lies in constructing the null hypothesis world !! Thanks for the video ..

[@AmitZalman]

holy sh this is the best video i've watched im taking ap psych and i had no clue what this meant. thank yo uso much

[@EnRouteToMoon]

Bravo Cassie, I like your style of narration :-)

[@karimnaufal9792]

Most amazing p-value explanation ever!

[@laryneskridge-williams7200]

OMG! You simplified the explanation of a p-value beautifully. I love the puppy example, metaphors help. Thank you so much 👃

[@Rainavina]

Finally made sense after watching 5-6 videos... thanks so much Fido!

[@keshavfarmaha249]

Very well explained, thanks a lot Would love to see more content on statistics basics

[@evelynepriestman3830]

Thanks Cassie......i was struggling with the p-value......it just turned out that I had not thought of it in the right way

[@BaronSpartan]

One of the best 3min vid I have ever seen.

[@vijaynagaonkar9087]

Thats the most brilliant and closer explaination found on youtube till now...... 👌👌👌👌👍👍👍👍🌹🌹🌹🌹🌹

[@marloscruzeiro5687]

Wow! Explained this way it gets soooo easy to understand. Brilliant video!

[@mynettepotgieter1866]

I have started a course in Data Analysis and p-values are, of course, involved. And the past week I struggled to fully comprehend p-values and the entire analysis thereof, but your explanation has helped a great deal. Thank you so much!

[@bhavesh655]

This is real intelligence, defining complicated concepts in an easy manner.

[@vintechtalk1094]

Brilliant explanation. I wish I could tell you in words as to how confused I was about this till I found your video. Really liked your example.. thank you so much :)

[@Natykn]

I love your explanation!

[@ebertolo100]

Amazing explanation! Thanks for sharing it! You made my world better!

[@tracihopper6715]

Thank you so much! Great for my students.

[@porfiriolima9963]

I adore your explanations! Period.

[@UCKszbcV]

Very good explanation and lovely accent

[@ryanchapman7845]

Great video! Your tone, and cadence and voice is a nice change of pace to listen too as well!

[@mario0riam795]

This was such a good explanation. Thank you!

[@TejNarayanan]

Wow..that's the simplest way to teach p-value. thank you

[@CodeEmporium]

Amazing!

[@diegobarrientos6271]

the explanation that i was looking for, thanks!

[@loganwebb5449]

I'm years late to this but wow, this was helpful.

[@RawanAdawi]

Thank you for explaining it so easily!

[@snowblossom6984]

Thank you for saving my brain cells that were about to be destroyed by watching several other videos on p-values 〒▽〒

Everything in this video is just beautiful.

[@swamynyc]

Loved everything abt the video except your boss trying to throw ads before I can actually watch it! Seriously - if someone’s willing to watch a video on p-value spate them the ads! Can’t believe you have an 8 year old either-well done!

[@dominikschlegel3767]

Very neat explanation!

[@Vintagetube310]

Couldn’t wrap my head around the puppy concept. However, it included puppies, so it’s a win for me.

[@randalllionelkharkrang4047]

I love your explanations. they are brilliant.

[@robertnewell5057]

Very enjoyable indeed. To be very honest I have to ask how improbable is improbable enough? We happen to say 'less than 1 in 20', but there are all sorts of reasons why that is a bad idea. Would we be happy with an incredibly invasive, painful, expensive treatment for a trivial illness that worked 19 times out of 20? Would we reject a cheap, painless, easy treatment for advance cancer that only worked 18 times out of 20? That's the great flaw with p values and the great strength of estimation (AKA confidence intervals). Oddly, a great many medical journals still use p values as the primary approach to testing.

[@andresgomez6575]

Really good explanation, thank you!

[@Hawkgoulet]

Are you serious??? I just spent so much time trying to understand what the heck the p-value was. You broke it down so easily.

[@iyedghedamsi3016]

Thank you for these ! please keep them coming

[@user_name_lol]

Thank you very much! I suppose I've finally got it.

[@akiekdeshmukh817]

thank you

[@mikhailgolubtsov5541]

Great explanation, thank you!

[@tanmayjagtap78]

Damn now I have to calculate p-value every time when my dog messed up my room. Gr8 explanation loved it.

[@pedronakada4483]

You can't never know for sure

[@historia_tego_swetra]

Someone's starting a vlog ;) Thanks, Cassie!

[@gabrielpontes5163]

Completely amazed about you! Very great work!

[@surithavitharana2859]

Simple and got it thanks in advance

[@aditya4974]

Thank you so much for the wonderful explanation! Please keep sharing :)

[@johannortje1594]

Thanks for this.

[@J_The_Colossal_Squid]

... constructed as to what was learned from putting to use statistic(s) testing of a sufficient sample wrought from the whole of that world, as held out to exist, arbeit while not necessarily having been in a reasonable position to access and assess the whole of all possible words of all sizes beforehand. :)

[@kabalyan]

Awesome video! Love your explanation. I didn’t know stats could be funny :D

[@alexmash1353]

Rarely leave a positive comment, but it was a very nice video! Thumbs up for you and (not) innocent Fido.

[@UTJK.]

Very clever explanation.

[@hagarali5009]

I didn't fully understand it yet, but she has a reaaaaally good voice and sense of humor and yea I can hear her voice all night long

[@rmcgraw7943]

Low pvals means low entropy, low surprise, ordered and expected distribution of reality?

[@ahmedelsabagh6990]

Great video!

[@hongbozhou2599]

Wow. Some inspiration there. Good Job!

[@uzairdadabhay5231]

beautiful explaination

[@narekgevorgyan9782]

Thank you. You're great!

[@johneagle4384]

Thank you very much! Now, I understand it!

[@manueldamora]

I just loved this video! thanks a lot for sharing x

[@ferreirafk]

Super I have done something similar to it to explain students. BRAVO Cassie!

[@ferreirafk]

I have not known your classes before, so it will be very useful for me.

[@username42]

dunno why but her voice is kinda mesmerizing

[@gustavovalencia556]

best explanation ever!

[@livingbyheart8510]

Thanks ❤

[@barbarasilveirafraga5692]

It's amazing!!! I loved!

[@hussambachour6068]

You have a beautiful mind

[@pj5855]

I love you... Finally I understand p value

[@123shainz]

Thanks

[@ImVedanshAgarwal]

My dog - Doesn't eat the food Me - Make null hypothesis - He doesn't like it, I analyze data and p value is so large , Now, I form an Alternate hypothesis - The food doesn't like him, P value comes small , I changed my dog 🥲

[@bambooook]

Great!

[@videopostrrr]

the puppies did help! thanks!

[@summerscoming123]

You mate just earned your self a sub!

[@raphaeldayan]

i love your videos!!! Thank you

[@tori6681]

THANK YOU!!!!!!!!!!!!!!!!

[@PersonalNotPrivate-rl8dv]

But, also, no, I'm swilling down my third cup of coffee today. Sleepy would not be the word for it. Assertion denied. 🤪

[@bizzonchik]

спасибо!

[@Sagar13iffy]

Wow! You think you were taught p-value badly. I was just told a formula to calculate it and compare it to 0.05 for some reason to accept or reject the null hypothesis. I am glad I don't do stats for a living. However, it would be worth wondering that with the base knowledge that I got, could I ever be a statistician in my life!? I think my course's name should have been "How to pass the stats course but fail life 101"

[@hafsteinneinarsson5462]

That's a great contribution, I will steal it (with a reference 0:)).

[@mahsaabidbid5775]

Great 👍

[@bandui4021]

unbelievable. thank you :=)

[@nano7586]

Okay, you said the p-value is a probability that the result is that ridiculous in a world where the dog didn't do that. But I hear statisticians tell me all the freaking time that the p-value is NOT a probability. So what am I getting wrong here? There are so many conflicting statements about that goddamn p-value I don't know where to start. I just see it as a tool to distinguish the signal from the noise with some sort of confidence, not more, not less.

[@BANKO007]

The p-value of a dog alone in the house for a long while is probably quite high.

[@davidestradacordova2260]

Genious

[@BhargavVelamala]

Awesome!

[@robertsarhanmd6433]

Excellent

[@PersonalNotPrivate-rl8dv]

Chicken or egg problem / Dealer's choice I reckon, oh yes I do, because, duh, duh, duh -- If you understand the purpose and use of null hypotheses before attempting to convey p-values vis-à-vis to them, _and_ have some basic understanding of probabilities then it seems to me you're well on your way to estimating something somehow.

[@ravishmahajan9314]

Well it's said that if you want to know how well you know a particular topic. Just try to explain to a 5 yrs old kid, if he understands it well, you know the topic well. And i must tell you, you know what p- value is???? ❤

[@jessamaeabrina2663]

I love youuuuuuuuuu

[@drchamp1902]

Isn’t that amazing that stupid videos get millions of views and this genus only gets a few thousand, speaks loudly about the state of our society

[@emremokoko]

p(D|H0). This is p-value :) There is nothing mysterious about it . It's just that it doesn't fit into the definition of frequentist probability, so they dont call it "probability".