👋🏼 Hi There! In this video we answer these questions: what is the Standard Deviation? What does the standard deviation measures? why do you divide by (n-1) (Degrees of Freedom) and more with examples. If you like to support us, you can Donate (bit.ly/2CWxnP2), Share our Videos, Leave us a Comment and Give us a Like 👍🏼! Either way We Thank You!
thanks...it's a bit of a tough one to explain...over the years, ive come up with a few more intuitive explanations for it...but always a challenging one...
if you can't explain it simply you didn't actually understand it. You're awesome. You takes simple example to explain complex terminologies . thank you
yeah, unfortunately a lot of the courses i took also focussed on memorization over understanding. we've currently got about 25 of these videos in the editing stage, and another 25+ to get recorded and then edited. they all will focus on the concepts, not the calculations,...so keep your eyes out for those...we're going to roll them out over the summer!
you gave me freedom from "degrees of freedom" very well explained. I am so unfortunate i have not met you so far. But i felt so fortunate the moment i saw your videos on stats. Awesome stuff. Marin.
Hey Mike! Wonderful description in brief. Now, I feel I can use these stats videos to make my dream come true (jumping into data science). Hoping to learn a lot of stats to make my foundations strong.... SALUTE
thanks a lot very for explaining in easy manner. I tried many videos but u cleared my degree of freedom concept. please upload a video which include most useful terms of statistic for data science
Thanks for the video. Do you have any video or material on internet which explains this mathematically? As you said , intuitive explanation is easy to grasp and a good starting point, like an analogy. Mathematical explanation gives the complete understanding.
Why divide by the degrees of freedom? Dividing by n makes sense because that it how you find an average. Why divide by the degrees of freedom to get an average? I haven't been able to figure that out and no seems to want to explain this on UA-cam. They just stop at "the degrees of freedom are n-1" and conclude with that's why n-1.
Wonderful video. I remember hearing a version of this presentation in my first statistics class back in 1972 or so. I'll encourage my students to watch this after they fail to understand my presentation on the topic. (By the way, can you explain the software/video technique that puts you behind the board?)
lol thanks! as an FYI, we are working on videos like this to fill out most of what is covered in a typical intro stats course, so please feel free to recommend as many as you see fit you your students. the tech is something called "light board". at UBC we get free access to it through "UBC Studios". many other universities also have a version of this. essentially, it is a sheet of glass that i write on with a set of neon white board markers, and a camera on the other side of the glass. after it is recorded, they flip the image (that's what it looks like I'm left handed...im actually right handed). if you search "light board" on UA-cam you can find some videos that show it. you can actually build one for pretty low cost (if you are handy). fortunately, we get access to one that has been built, and has technicians to handle all of the tech for us...
Thanks. I looked up the developer's website and it really does look like something that could be created for a reasonable cost. I'll be looking for additional videos as they are produced, as my students (especially in online sections) can use all the help they can get. I make use of many of your R videos and have found them among the best for basic concepts is R.
We talk about degrees of freedom when we use t, F, Chi or other distributions while testing hypotheses, but we do not not talk about them when using z test. Why? And are you aware of any article that answers or discusses this topic?
I have a question: why did you not put the number on module instead of square the numbers? The calculus would be much easier to solve, also It could have worked better if the problem lays on opposite signs canceling each other out.
lol, no what happens is that the image is "mirrored" afterwards, so that things flip and are visible the right way. im actually right handed, but in the videos i appear left handed because the image has bene mirrored :)
This explanation was meant to remind that working with absolute values is not a smooth mathematical function, while working with “squares” is a smooth mathematical function with nicer mathematical properties. Really, just wanted to make the point that using squares is a (reasonable) choice, but not the only option...and to explain why the SD doesn’t use absolute values instead
okay, so I understand losing a degree of freedom, and that makes sense for multiple values. But how do you explain one variable. The deviation, any type, should be zero, since it is itself the mean. However, when using n-1, you'd get zero, which implies that the standard deviation does not exist for one variable, is that correct?
yeah, that's basically it. with a n=1, that observation is your estimate of the mean, and you dont have any data/observations left to estimate the SD with....your df become 0...you have no degrees of freedom left to estimate the SD with
It deosnt make sense to me. How come one knows the mean 80 without knowing x4? x1 x2 x3 and x4 all has to be known to know their mean. I dont get this.
👋🏼 Hi There! In this video we answer these questions: what is the Standard Deviation? What does the standard deviation measures? why do you divide by (n-1) (Degrees of Freedom) and more with examples. If you like to support us, you can Donate (bit.ly/2CWxnP2), Share our Videos, Leave us a Comment and Give us a Like 👍🏼! Either way We Thank You!
Never in my life I have thought about why SD is important, this video really helped me!
This video does a good job of explaining degrees of freedom as well!
thanks...it's a bit of a tough one to explain...over the years, ive come up with a few more intuitive explanations for it...but always a challenging one...
Sir, you are a legend. I enjoy every piece of information you say. The best statistics course on the whole Internet.
Thank you so much.
Thanks, I really appreciate that :)
LOL. Loved the end voice.
thanks, that's our son...he's starting to contribute to the video production ;)
if you can't explain it simply you didn't actually understand it. You're awesome. You takes simple example to explain complex terminologies . thank you
I always memorized the formula and never really thought about it, until now.
yeah, unfortunately a lot of the courses i took also focussed on memorization over understanding. we've currently got about 25 of these videos in the editing stage, and another 25+ to get recorded and then edited. they all will focus on the concepts, not the calculations,...so keep your eyes out for those...we're going to roll them out over the summer!
Breaking down complex things into simpler things(Easy to understand).
you're GREAT.
It has been a year I was wondering why we subtract 1 from n when calculating the sample std. Thanks for this informative video! Amazing delivery!
you gave me freedom from "degrees of freedom" very well explained. I am so unfortunate i have not met you so far. But i felt so fortunate the moment i saw your videos on stats. Awesome stuff. Marin.
Thank You very much sir. You helped understand degree of freedom in a simple way
Explaining degrees of freedom while writing mirror image of every character on the glass. Impressive!
thanks :)
Sir you made statistics very easy for me, very usefull course, Even in paid courses we cannot see such kind of explanation,
Very intuitive explanation.
You are the best statistician. Thanks a lot.
thanks, appreciate that!
You made pretty easy every concept of statistics. Thanks for your effort.
Great teaching and explanation/example of degrees of freedom, variance and SD. thanks!
Thankyou so much for the degrees of freedom concept! It was so simple yet so elusive to me till now
Hey Mike! Wonderful description in brief. Now, I feel I can use these stats videos to make my dream come true (jumping into data science).
Hoping to learn a lot of stats to make my foundations strong.... SALUTE
Hope you enjoy them, and learn a lot :)
thank you sir, your explanations are very simple and has lot of useful information.
Mike!! Good to see you^^ its been a long time!
Yay! Mike finally shows his face :) Thanks for this video Mike
lol, it took a while...now we'll have to try and get Ladan in front of the camera ;)
and Kian too ! :)
You have explained it so clearly, Thank you!!
Thank you for this simple and effective explanation!
You’re welcome
Thank you very much for the explanation. As an English learner, I could understand what you expalin and aslo be interested at your video.
great to hear!
Omg, everything have made more sense to me now!
thanks a lot very for explaining in easy manner. I tried many videos but u cleared my degree of freedom concept. please upload a video which include most useful terms of statistic for data science
Superb explanation. Thank you so much.
Thanks for the video. Do you have any video or material on internet which explains this mathematically? As you said , intuitive explanation is easy to grasp and a good starting point, like an analogy. Mathematical explanation gives the complete understanding.
Bessel's correction
very useful explanation
I did not understood why I subtract 1 from n, thanks for clearing this concept.
Great production!
Thank you for all the videos! Do you have please tutorial about how plotting standard deviation with R studio?
Excellent
Thank you Sir
Thank for the video. it is so informative and useful.
Yep very good indeed thanks Mike
Excellent!
Why divide by the degrees of freedom? Dividing by n makes sense because that it how you find an average. Why divide by the degrees of freedom to get an average? I haven't been able to figure that out and no seems to want to explain this on UA-cam. They just stop at "the degrees of freedom are n-1" and conclude with that's why n-1.
Wonderful video. I remember hearing a version of this presentation in my first statistics class back in 1972 or so. I'll encourage my students to watch this after they fail to understand my presentation on the topic. (By the way, can you explain the software/video technique that puts you behind the board?)
lol thanks! as an FYI, we are working on videos like this to fill out most of what is covered in a typical intro stats course, so please feel free to recommend as many as you see fit you your students.
the tech is something called "light board". at UBC we get free access to it through "UBC Studios". many other universities also have a version of this. essentially, it is a sheet of glass that i write on with a set of neon white board markers, and a camera on the other side of the glass. after it is recorded, they flip the image (that's what it looks like I'm left handed...im actually right handed). if you search "light board" on UA-cam you can find some videos that show it. you can actually build one for pretty low cost (if you are handy). fortunately, we get access to one that has been built, and has technicians to handle all of the tech for us...
Thanks. I looked up the developer's website and it really does look like something that could be created for a reasonable cost. I'll be looking for additional videos as they are produced, as my students (especially in online sections) can use all the help they can get. I make use of many of your R videos and have found them among the best for basic concepts is R.
You are just brilliant
You videos are amazin,g thank you so much!
Thanks so much!
We talk about degrees of freedom when we use t, F, Chi or other distributions while testing hypotheses, but we do not not talk about them when using z test. Why? And are you aware of any article that answers or discusses this topic?
Excellent
I have a question: why did you not put the number on module instead of square the numbers? The calculus would be much easier to solve, also It could have worked better if the problem lays on opposite signs canceling each other out.
if he's on the other side of the glass is he writing everything laterally inverted so we can read them normally?
lol, no what happens is that the image is "mirrored" afterwards, so that things flip and are visible the right way. im actually right handed, but in the videos i appear left handed because the image has bene mirrored :)
It's good actually it's good 😊
@3.29 Why would we want to plot x vs abs(x) here in the scenario?
This explanation was meant to remind that working with absolute values is not a smooth mathematical function, while working with “squares” is a smooth mathematical function with nicer mathematical properties.
Really, just wanted to make the point that using squares is a (reasonable) choice, but not the only option...and to explain why the SD doesn’t use absolute values instead
Awesome
you are great!
Thanks
sum of all the deviations / no. of deviations = average deviation (from the mean)❤️👍
beautiful
okay, so I understand losing a degree of freedom, and that makes sense for multiple values. But how do you explain one variable. The deviation, any type, should be zero, since it is itself the mean. However, when using n-1, you'd get zero, which implies that the standard deviation does not exist for one variable, is that correct?
yeah, that's basically it. with a n=1, that observation is your estimate of the mean, and you dont have any data/observations left to estimate the SD with....your df become 0...you have no degrees of freedom left to estimate the SD with
great
Thank you so much Mike! and tell that lil boy i love stat too...sweetu
#edited
i wiil...that's our son...he wanted to contribute to our videos too ;)
Yes it is great to see your face. :-)
thanks, i took a while before finally getting in front of the camera :)
Is he writing backwards or there is a program for this?
my thoughts exactly, it seems so.
It deosnt make sense to me. How come one knows the mean 80 without knowing x4? x1 x2 x3 and x4 all has to be known to know their mean. I dont get this.
07:20
The videos in this playlist are not in order. If you could put them in order, it will be a great help.
Even I find videos are not organised in a fashion.
Okay, but the real question is how is this guy writing backward?
this explains the degrees of freedom well ... but it didn't explain why we need to divide by DOF instead of n?