That's way easier than what was thaught to us in applied statistics. In our 1 1/2 hr class, the prof showed some k shenanigans where you can just find the 2 values near what you get from dividing percentile by 100 then multiplying it with n+!
Thank you a lot! You saved me from failing tomorrow's exam. My teacher Usha is too stupid. She took an hour to explain the same thing and most students in my class were unable to understand it.
Is there a contradiction here? In this video it's stated that 5 is the value corresponding to a 25th percentile ranking. If I understand the given definition of a percentile correctly, this would mean 25% of the elements should fall below the value 5. However this is false, since only 20% of the elements in this set fall below 5.
After further thought, I feel that the only thing that needs to change here is the given definition for a percentile. Namely, the "boundary point" should be included. So something like this -- "A percentile is a value for which a certain percentage of values lie at or below." Otherwise...great explanation.
My uni textbook gave such an overcomplex way of finding percentile values that I totally forgot there was such a simple way of finding it, i was getting ready to calculate category boundaries and cumulative percentages and all that crap 😅
This is wrong! the formula is basically for the location of the percentile. so if you get 5.25 then it means its between 5th and 6th location. so what you gotta do is multiply .25 by diff of location 5 an 6 and then add that value to location 5. lemme explain by an example! 0 0 5 7 8 9 12 14 22 33 now to calculate 25th percentile or 1 st quartile L(25)= (10+1)*25/100=2.75 this means that the position of the 25th percentile is 2.75 now, .75 more than 2nd position so .75*(5-0)=3.75 {5-0 because 2nd location value is 0 and 3 location value is 5 and percentile location is 2.75} now al you gotta do is add 3.75 to the 2nd location L(25)=0+3.75!
Great video. I don't expect you'll answer as this instructional is quite old and out of your thoughts. But I ask anyway for the benefit of the community here. What would you do if your 5th value had been, say, 4? The average there is 4.5, which is still not a value you in your data set. Would a legitimate answer be? Would you round (as one exchange here opined)?
If we followed the same definition it means that when ask what is the quartile or 25 percentile ranking at? We mean what is the rank of the number 5 since it lays after 5 numbers from a population of 20 ? 20/4 the two example you have provided are deferent !
It's the opposite of what you'd do when calculating the percentile. Try writing out the same percentile formula with the value number left unknown, with some easy algebra you'll get value = (percentile/100)*(n+1)
Because we are finding the position. For any data, to determine the middle position we could use (n plus 1)/2. Because we are taking (n plus 1) × 50%. So in order to determine the position say the 25th percentile we could take 25% of (n+1).
How did the equation that multiplies percentile with (n+1) come about, how did anyone come up with this, how does it even work. I feel like this is the most important bit about maths, because you can't only use given equations as tools
Okey, it's more logical with an example. Look at the list of numbers: 1,2,3,4,5, What is the 50 percentile (The number in the middle)? If you dont add the 1 to n, you get(from equation at 2,30): 50/100*(5) = (1/2)*5= 2,5 That is wrong, it should be 3. Now look at it if you add 1: 50/100*(5+1) = (1/2)*6= 3 The reason you add 1, is because it makes the answer better. I don't think there is a proof for this in introduction courses ;)
Wtf! When I did that p/100 * (n+1) thing I got 6.5 so then I rounded up to 7 and if I go between the 7th and 8th number in my list, I get 18, but that doesn't make any sense because if I do it on my TI-84, it says the 25th percentile is 15! I did it another way by doing (.25)(25)=6.25, rounded down to 6, and went in between the 6th and 7th number and got 15. So this way makes no freaking sense!
So if the percentile is 5.25, I take the average of the 5th and 6th right? What is the 5th value is 5, and the 6th is 6. That means... 5 + 6 / 2 = 5.5. I am still left with a number that's not whole.
No, you don't just round it off to 6 if the number is not whole you just need to round it off to the next number example 5.25 so 6 you don't need to get the average if the given is not whole number then just leave 5.25 be if it is a whole number then round if off to the next number hope it helps :)
shouldn't have given up my notebook to someone, but whatever I have yt I don't need that today. I just wanna check when to add n(+1) because in the trimmed mean we don't add +1.
10 years after you made it, still helping students (FYI) 👍🏻 Thanks man
I love you too
I have a biostatistics exam tomorrow, this was a HUGE help, thank you.
+Rebecca Uzoh i have a stats one tomorrow as well! good luck!
My DAR (Data analytics and representation) exam tomorrow too!
Did you get a good grade?
@@eliezerriveraeli6856 Yes I did!!
I have a stats test tomorrow as well but in the present
My professor couldn't explain this very well and neither could the book. This was so helpful, keep up the good work!
What percentile would be 11? I hope u don't mind explaining
That's way easier than what was thaught to us in applied statistics. In our 1 1/2 hr class, the prof showed some k shenanigans where you can just find the 2 values near what you get from dividing percentile by 100 then multiplying it with n+!
Explained everything I never understood neatly and quickly. Wonderful!
jeez i cant believe u are probabaly near or in 30s now
@@kyedae9066 31, and now a PhD student working with statistics every day!
@@occupiedusername are you still alive ?
literally better explanation than my college professor and his notes. Professors make these things seem so complicated with other useless information
bro I know, my college professor is so ass at teaching us it sounds like gibberish
I have a Medical stats test in 3 hours. This helped!!!
You explained it so clearly, thank you.
I Can~t believe I learned it in 3 min, thank you! haha
Like my channel for more
You explained something in 3 minutes that a class wouldn't do
Reversing 1st formula and increasing one in postion gives 6th position
In 2nd formula why 20+1?
thank you so much for carrying me through statistics.
I'm a visual learner and this helped a lot. Thanks (:
Thank you a lot! You saved me from failing tomorrow's exam. My teacher Usha is too stupid. She took an hour to explain the same thing and most students in my class were unable to understand it.
iitm online degree?
@@mrbeastindia8660 Nope, she was a faculty at my college. I am sure you're talking about Usha Mohan right?
@@SagarKumar-su3kb yes the statistics teacher, i have enrolled in the degree and she's my stats teacher
@@mrbeastindia8660 enjoy your stats classes
thank you so much .. I answered a couple of my community medicine questions in my exam thanks to this video
Thank you very much! You've helped me so much. I love how concise but extremely helpful your videos are. Subscribed :)
This was very helpful. Only question I have is why do we use the 5th and 6th value to get the average?
Because the value is 5.25th number..that means between 5th and 6th value..thats why we take the avg….i am literally replying after a year…pardon me
Is there a contradiction here? In this video it's stated that 5 is the value corresponding to a 25th percentile ranking. If I understand the given definition of a percentile correctly, this would mean 25% of the elements should fall below the value 5. However this is false, since only 20% of the elements in this set fall below 5.
After further thought, I feel that the only thing that needs to change here is the given definition for a percentile. Namely, the "boundary point" should be included. So something like this -- "A percentile is a value for which a certain percentage of values lie at or below." Otherwise...great explanation.
This was a last minute help for my stats exam, thanks very much!
his was very helpful. Only question I have is why do we use the 5th and 6th value to get the average?
My uni textbook gave such an overcomplex way of finding percentile values that I totally forgot there was such a simple way of finding it, i was getting ready to calculate category boundaries and cumulative percentages and all that crap 😅
This is wrong!
the formula is basically for the location of the percentile.
so if you get 5.25 then it means its between 5th and 6th location.
so what you gotta do is multiply .25 by diff of location 5 an 6 and then add that value to location 5.
lemme explain by an example!
0 0 5 7 8 9 12 14 22 33
now to calculate 25th percentile or 1 st quartile
L(25)= (10+1)*25/100=2.75
this means that the position of the 25th percentile is 2.75
now, .75 more than 2nd position
so .75*(5-0)=3.75 {5-0 because 2nd location value is 0 and 3 location value is 5 and percentile location is 2.75}
now al you gotta do is add 3.75 to the 2nd location
L(25)=0+3.75!
that is exactly what he told.. it is for VALUE NUMBER not the value..
Hi.. I need help in statistics can you help me.
Holy crap, this video is 10 years old?!
Great video. I don't expect you'll answer as this instructional is quite old and out of your thoughts. But I ask anyway for the benefit of the community here.
What would you do if your 5th value had been, say, 4? The average there is 4.5, which is still not a value you in your data set. Would a legitimate answer be? Would you round (as one exchange here opined)?
If 10 occurs twice then how calculation happens. You didn't explain huh.
If we followed the same definition it means that when ask what is the quartile or 25 percentile ranking at? We mean what is the rank of the number 5 since it lays after 5 numbers from a population of 20 ? 20/4 the two example you have provided are deferent !
this was so helpful! made my homework much easier
why (n+ 1) when calculating 25% percentile
cuz you start counting from 0 and not from 1.
It's the opposite of what you'd do when calculating the percentile. Try writing out the same percentile formula with the value number left unknown, with some easy algebra you'll get value = (percentile/100)*(n+1)
MusicJunkie Still can't get it....
Because that is individual series
Because we are finding the position. For any data, to determine the middle position we could use (n plus 1)/2. Because we are taking (n plus 1) × 50%. So in order to determine the position say the 25th percentile we could take 25% of (n+1).
finally i understand my topic...where ever we gonna meet,i will give you a hundred dollar
Don't you round up 5.25 to 6 so you get the average of the 6th and 7th term? But then again it's still 5+5/2 so the answer is the same.
In my book a question had percentile rank position 20 why he than took avg of 20and 21 or is it wrong in book?
Thank you, it still works in 2021
when you summarize 2 hours lecture in 3 minutes
thank you soooooooo much for making the understanding so easy
at 3:03, what if your data set is smaller and only has 4 numbers? What do you do about needing the 5th and 6th values of the data set?
Very clear and direct, thank you! ♥
thank you. did a good job covering the important things.
SUPER helpful :) Thank you and God bless your soul (if there is a God n a soul ;)) THANK YOU again :)
how does it work that 10 has the ranking of 80% but using the second formula, the 80th percentile lies at the 16.8th value which is between 9 and 10?
I hope this helps me with my test tomorrow. I have a better understanding of the topic but I'm still a little shaky. Thanks overall tho. 😁
it is so clear. Thanks for your time.
LOVED it, thank you!
Thank you very much
How did the equation that multiplies percentile with (n+1) come about, how did anyone come up with this, how does it even work. I feel like this is the most important bit about maths, because you can't only use given equations as tools
you made it soooooo simple! Thanks!!!!
This was great, it really helped me out a lot :)
Could you briefly explain why the formula to obtain the Value # is the way it is?
I liked the way this guy described it. A little different than the way I described it on my video
compre ko sa saturday.. i hope this lesson will help me
yay now i dont have to fail my grade 12 math exam tomorrow!
Sven Dubliano I need this for 6th grade online homework and I don’t get it at all
Short and meaningfull thank you
I didn't know hero's still existed.
Thank this really helped me a lot!
This help me a lot ty
Okey, it's more logical with an example.
Look at the list of numbers: 1,2,3,4,5,
What is the 50 percentile (The number in the middle)?
If you dont add the 1 to n, you get(from equation at 2,30):
50/100*(5) = (1/2)*5= 2,5
That is wrong, it should be 3.
Now look at it if you add 1:
50/100*(5+1) = (1/2)*6= 3
The reason you add 1, is because it makes the answer better. I don't think there is a proof for this in introduction courses ;)
If more than a single person get the same marks, will the percentile of all of them holding the same marks will be same?
Isn't 10 included in the percentile ranking? So it should be 17/20 *100percent, no?
wow, you made it so simple, thanks!
So clear, thank you.
short yet consice and clear 👍👍👍👍
For the part a 2:58. What if you get an odd number and your mean is a fraction that is not part of the data set? Would you round?
this was really helpful video thanks alot man
Wtf! When I did that p/100 * (n+1) thing I got 6.5 so then I rounded up to 7 and if I go between the 7th and 8th number in my list, I get 18, but that doesn't make any sense because if I do it on my TI-84, it says the 25th percentile is 15! I did it another way by doing (.25)(25)=6.25, rounded down to 6, and went in between the 6th and 7th number and got 15. So this way makes no freaking sense!
Below and equal to
Simple and elegant !!
So if the percentile is 5.25, I take the average of the 5th and 6th right?
What is the 5th value is 5, and the 6th is 6.
That means... 5 + 6 / 2 = 5.5.
I am still left with a number that's not whole.
No, you don't just round it off to 6 if the number is not whole you just need to round it off to the next number example 5.25 so 6 you don't need to get the average if the given is not whole number then just leave 5.25 be if it is a whole number then round if off to the next number hope it helps :)
why standard deviation is denoted by sigma
thank you so much this helped me a lot
In the 25% sample, what does the number 1 in the parenthesis represent?
Yeah, brief and çlear. Thanks ıt just was what ı looking for
Thank you so much for this
this video very understanding helpfully
Shouldn't 12 correspond to the 100th percentile in the list ?
So if what if I find the mean of the 5th and 6th percentile and still get a decimal? What do I do then? Round?
thanks this was really helpful
I love you!!! So helpful
I still don't quite understand percentiles, but I think the formulas will be helpful until I do. Thanks!
+Amanda G Wait, nope, that doesn't seem to work for area under a curve.
Why we add 1 sir
Thank you very much.
Thank you professor
That was helpful! thank you!!
quite helpful, thanks!
Thank you soooo much , I really appreciate 🙂
@ 3:05 I don't understand how it became 5+5 shouldn't it be 5+6?
Who else is here because of online school??
brilliant explanation .. :-) simple ... thank you
At 1.46 it should be 16 divided by 20 and not 10
Thank you so much. You made my day.... :)
shouldn't have given up my notebook to someone, but whatever I have yt I don't need that today. I just wanna check when to add n(+1) because in the trimmed mean we don't add +1.
+Kyaiaia Kyaiaia so basically percentage and quartiles are the same thing we still add +1 to n. nothing is confusing anymore ..
Thank you sooooo much!
is it necessary to arrange data in ascending order
why does the formula work??
what is the percentile ranking of 11 ?
🙏 thanks sir
Thank you so much!!!!
They have the same voice of seananners. Try to search it on youtube
Great, thanks 🌹🌹🌹
Why did you add 1 to n?
thank yo so much for this explanation
nice video thank you very much