The way you have you change the MGF of X to MGF of Y is very Neat! I was confused at first as to how it would be done.
@expotechservices19528 жыл бұрын
Great videos. Clearly explained. I have subscribed to your channel. Please make videos of hypothesis testing, estimation theory, multivariate analysis, time series analysis, analysis of sample surveys & stochastic processes. Thank you.
@stephaniestoudenmire425710 жыл бұрын
Thank you so much for your videos you are so helpful and watching gets me excited about stats. I would jump for joy if you came out with some videos with practice problems
@sorooshusa9 жыл бұрын
you explain this very well. only if my teacher would have done the same thing, so i wouldnt have to teach myself via youtube. if im not learning stuff in class but i am learning here, the teacher is to be blamed. and why am i paying so much in tuition for some incompetent teacher at university?
@WateryIce543219 жыл бұрын
+sorooshusa Because explaining for a general audience is a gift very few have :(
@sorooshusa9 жыл бұрын
WateryIce54321 true. and thats why often after each lecture i go online to have a different teacher explain the same concept, and then i totally get it.
@TheKiosk949 жыл бұрын
+sorooshusa You know funny thing, I actually met someone who actually thinks that there is no such thing as a good or a bad teacher. So, apparently, it's all up to the student to learn the material. So, according to him, the teacher is not to be blamed but you. It sounds like bs though.
@WateryIce543219 жыл бұрын
+TheKiosk94 at that point they're saying it doesn't matter who is teaching because you're going to teach yourself. which, is true, but sad. kind of begs the question, what do you think is the point of having a teacher?
@lilmoesk8997 жыл бұрын
As I am also trying to teach myself through KZbin, I come across comments like this all the time. I think slowly universities are realizing that just having a Ph.D. doesn't mean you know how to teach anything. In my opinion, all university instructors should be required to undergo basic pedagogical training before teaching any courses. It's sad how many of my colleagues with Ph.Ds have no clue about how the brain works, or how memories or formed, or just more generally, how learning works.
@sumanyousingh76044 жыл бұрын
Very simple explanation 👌👍 Love from India ❤️❤️
@Metachief_X7 жыл бұрын
Explained very nicely!! Thank you very much!!!
@anatolypaul45166 жыл бұрын
Thanks alot, I have clearly gotten the concept behind m.g.f ,thanks alot once again
@FungSit10 жыл бұрын
Very clear! Thanks!
@adhishmalviya4266 жыл бұрын
Thank you so much...it helped a lot.
@soldierofislam19411 жыл бұрын
Why can't you differentiate the moment generating function simply and substitute t=0 to get the value of E(X)? THANKS For the last question.
@hanafu32126 жыл бұрын
I notice the same
@tshepisotsotetsi29035 жыл бұрын
What would you then do with that E(X)? Notice we want the E(Y), which is the function we were given at the beginning, we can't just simply sub in that E(X)... Get it?
@maureenhamilton74608 жыл бұрын
The mgf for a Uniform Discrete is not defined when t=0. I can still find moments by taking limit when t-->0 of the various derivatives. Is it actually incorrect when we say that the first moment is the first derivative evaluated at 0. Is it more correct to say that the first moment is the limit as t-->0 even if the mgf is not defined at t=0.
@tshepisotsotetsi29035 жыл бұрын
No. And that distribution does not have an mgf, it doesn't exist.
@mattermax10 жыл бұрын
thank you
@senaitmetaferia905210 жыл бұрын
thanks soo much !!!!!¬!!
@calvinotao93099 жыл бұрын
who knows how to convert an mgf to a pdf
@AngelRivera-mc8zc6 жыл бұрын
Calvin Otao fds
@Dudemar09 жыл бұрын
good vid srsly fuk mgfs tho
@tasleemkhan56936 жыл бұрын
ungrounded data ke leya relation between raw and central moment
@BlackStarSeries6 жыл бұрын
It's important bro! Lol.
@axollotl58135 жыл бұрын
1 hour before my exam and this man is always here to save my ass
@johncarpenter217210 жыл бұрын
Just a quick reminder it is |r|
@tshepisotsotetsi29035 жыл бұрын
I was thinking the same thing, And I thought he would fix it when he kept saying neighborhood of 0.
@landwalker883 жыл бұрын
Why didn't we have to take the derivative of the MGF before plugging in ln(.5)?
@victormadu16355 жыл бұрын
hope those that disliked this video are not human. This is one of the best tutorial videos i have ever seen in my life.
@sarahk99944 жыл бұрын
How is (3/4)/[4((1-1)/4)^2] not 0 but 1/3 ??
@syedahmedali74177 жыл бұрын
thankyou so much the lecture is astounding...
@48_subhambanerjee222 жыл бұрын
ok.... this was very helpfull... thanks sir... love from india
@SanderHeieren6 жыл бұрын
How would you change the problem if k starts at 1 and goes up to n-1? Also with the function being 1/(2*(y-1))
@61837240598 жыл бұрын
Hi. What is the name of the whiteboard technology you use to solve problems?
@DumboSanchez10 жыл бұрын
Fantastic video! much better for learning and understanding than my actual lectures!
@MrSleepinsideme8 жыл бұрын
In the example, where did the "after three years" info get applied?
@ruanrichter8 жыл бұрын
It didn't, but it didn't need to. That was just setting up the question. It may as well have said; "after some period of time, let's call it 5 years..." or whatever. The actual mathematics question in there, if you want to call it that, is just that you have a random variable x, with the given MGF and you needed to calculate the expected value of g(x), where g(x) = 100(0.5)^x. That three years was just a random time, and was to set up the question and for it to have a tie to some real world situation. If you think about it, it wouldn't make sense for the value of the pice of equipment to be random at the present time... as they would know what it was worth then. Does that help?
@jackdog57556 жыл бұрын
thank you for all the vids, going in a month to take the exam p. These vids are for sure a great refresher
@AkashdeepSingh-qq5fw3 жыл бұрын
thank you for the great video! but the mic is just too much of a treble. With volume set to max at the beginning of video my ears pained and then I jumped from the seat. Could you please fix and replace the audio if you have time. The crystal voice was a bit of a pain for my ears
@Nickuncle9 жыл бұрын
You forgot to link the proof. Otherwise, very clear.
@roykwokkp7 жыл бұрын
By Taylor series expansion of e^(tX)!!!
@henokgebeyehu15074 жыл бұрын
Thank you for the explanation. These are mostly just bookmarks that I am using for myself as I am preparing for a final exam in a month and really want to make sure that I have all of the resources needed when I am to hardcore study. 8:38 If MGF is known, then in some cases, computing expected value/second moment/third moment can become easier than using the standard definition of expected value. Do this by deriving and evaluating with t = 0. 11:04 Can use taylor series expansion to represent the MGF 14:30 Example: Find the expected value of Y = g(x) when the MGF of x is given.
@evantilley2 жыл бұрын
ive got my final in 8 hrs (gotta sleep somewhere in there too), and it's not looking good lol but this video is my last hope
@enigma73415 жыл бұрын
This guy is damn good explaining topics my professor of 30 years cannot do
@teamstudent45552 жыл бұрын
@16.47 why did we multiply the MGF by 100 rather than differentiate it? Very nic e vid btw
@firdovsihasanzada4 жыл бұрын
Thanks! I got some basic understandings of this topic in my head.
@que_936 жыл бұрын
You did not tell what 't' stands for here.
@abdulrahmanafifi8915 жыл бұрын
't' is just a dummy variable and has no meaning in life...acting as a label for the probability.
@tshepisotsotetsi29035 жыл бұрын
It doesn't matter. 't' can be anything really.
@dursundurmaz9155 жыл бұрын
where is the proof video? for E(x power k) 4:25
@biniljoy25423 жыл бұрын
1st in 2021💪
@monikamittalmm2 жыл бұрын
Your explanation is very good. I watch your videos. Thanks a lot
@lesegomokgabudi57985 жыл бұрын
Thanks Sir.... may God bless you and your family
@lauravalenzvalenz3 жыл бұрын
The rewrite step you did in 14:56 was to obtain the exponencial, right? And you did that because you know you have the MGF
@jongsoolee58948 жыл бұрын
Good video! I have one question about your comment on calculating E(x). Instead of using the MGF, is it possible to calculate E(x) directly. If possible, show me the detail please. You just said that it is just difficult in the video. Thank you in advance.
@b.c297210 жыл бұрын
For the derivative of (3/4)/(1-(e^t/4)), I got a different answer of 3/16 instead of what the video shows. is anyone finding this?
@ClaudKaKeiYeung10 жыл бұрын
www.wolframalpha.com/input/?i=0.75*%281-%28e%5Et%29%2F4%29%5E%28-1%29 but I haven't checked by hand
@ClaudKaKeiYeung10 жыл бұрын
M'(x)=\frac{d}{dt}\left[ \frac{3}{4}(1-\frac{e^t}{4})^{-1} ight] =\frac{-3}{4}(1-\frac{e^t}{4})^{-2}\frac{-e^t}{4} for t=0 M'(x)=\frac{-3}{4}(1-\frac{1}{4})^{-2}\frac{-1}{4} =\frac{1}{3} So wolfram was wrong and Actuarial Path is correct =D
@analyticsworld43775 жыл бұрын
Very well explained. Thanks a lot to make the concept clear
@TheNomadic696 жыл бұрын
Im very surprised to see that no one seems to provide a combinatorial derivation.
@tshepisotsotetsi29035 жыл бұрын
What's that?
@pjk76854 жыл бұрын
certains parts of this vid makes so much more sense, and then your video helped click some things looking at my prof notes of a review practice problems
@tanshinhui11 жыл бұрын
Thank you so much. It helps A LOT!
@Gengar993 жыл бұрын
I wish you were my prob teacher.
@avedissian9 жыл бұрын
Where's the proof?
@mcaluag11 жыл бұрын
I had several "a-ha" moments watching this (n.p.i.). tyvm
@pempherokandoje152710 жыл бұрын
where do i find the link to that proof again?
@pauljohncapote75413 жыл бұрын
Now is 2020. This really helps me in my Probability Theory. Thanks
@playerthree57429 жыл бұрын
Anyone know where can I find derive joint mgf of bivariate normal distribution
@yushihu6984 жыл бұрын
where's the link of proving the relation between MGF and E[X]
@haithamabdelrahman62763 жыл бұрын
Where is the proof pls , at 4:20
@rabiaal87005 жыл бұрын
I am taking probability lecture at my school and professor gave an assignment but I couldn't solve 1 question from it. question askes that if X is a binomial random variable with parameter (n,p) and Y=X^2 . find the variance of Y by using characteristic function of X. after watching this video I would solve this question in that way; Var(Y) = E(Y^2) - [E(Y)]^2 Var(Y) = E[x^2)^2] - [E(x^2)]^2 after that point I thought that I need to take fourth derivative of the characteristic function of X and take second derivstive of characteristic function of X and take its square root am I right?? characteristic function of X = Φx(w) = (1 - p + pe^(jw))^n I am not sure if this thought is correct can you help me?
@tshepisotsotetsi29035 жыл бұрын
I agree with your thought process, I think it's 100% correct.
@digambarshinde65943 жыл бұрын
Why this is called m g f
@larryzhang21229 жыл бұрын
much clear now after watched this video! thanks!
@randydiaz95378 жыл бұрын
it is perfect until you say recall that a moment generating function is e(x),E(x^2)
@janewong59943 жыл бұрын
am i the only one who realised the video was posted on valentines day? Is that why Statistic and I broke up? I wasnt as dedicated as this dude
@StatCourses3 жыл бұрын
Haha. I myself didn’t! Perhaps the reason I am still married lol
@kingjake83766 жыл бұрын
Hello sir how can I get the link about deriving mgf
@newthee8 жыл бұрын
I hope you explain me about Joint Moment Generating Functions , please
@Ferylopenguin4 ай бұрын
ZAAAAAAAAAMN
@larrymintz52596 жыл бұрын
What is 1-e^t/4 simplified to as one expression
@adityamisra77023 жыл бұрын
THANK YOU SIR
@yangqiwei88906 жыл бұрын
Thank you, it really helps me.
@ankita10844 жыл бұрын
Sir please explain how to solve Mx(ln.5)
@silasarmah6022 жыл бұрын
Good work sir
@karencastelino17933 жыл бұрын
Amazing vid! Keep up the good job, mate!
@twilight1176 Жыл бұрын
LIFE SAVER
@Mannimal174 жыл бұрын
Thank you for this video. Very clear and helpful!
@abhisekmishra28174 жыл бұрын
Really good video.. couple of queries, though.. a) what is the significance of moment, physical interpretation b) from where moment generating function originate? c) what if t assumes other numerical values? does it have any significance.. I would be glad if these are answered... TIA
@StatCourses4 жыл бұрын
Great questions! Moment generating functions are special cases of characteristic functions, which are Fourier transformations of probability density functions. I may need to make another video just to answer your thoughtful questions. Your questions also lead me to believe you are capable of getting some answers if I point you to a couple of resources: From a historical perspective, the ideas of MGF were present in the book “Docrtine of Chances” by Abraham de Moivre (1667-1754). Mackey, George W. Harmonic analysis as the exploitation of symmetry-a historical survey. Bull. Amer. Math. Soc. 3 (1980), no. 1, part 1, 543-698 gives a great historical background of harmonic analysis and Fourier Transforms. For an intuitive and visual description of Fourier transforms, I recommend a video by 3blue1brown: kzbin.info/www/bejne/qaG4f6Ove5preLs. It explains that Fourier transforms decompose a signal into its components. It also does a good job of connecting to the idea of detecting the center of mass (c.f., the expected value can intuitively be thought as the center of mass of the probability density function).
@abhisekmishra28174 жыл бұрын
A Statistical Path thank you very much sir, I will go through the resources... Regards, Abhisek
@Mohamed-Alii4 жыл бұрын
of the proof
@venkatbaratam7889 Жыл бұрын
tq sir
@rorschach74236 жыл бұрын
Dude, sorry but how slow are you speaking? x1.5 speed sounds way normal than normal speed
@СергейПоклонский-х2ъ6 жыл бұрын
fuck you
@siulungsuen91074 жыл бұрын
very detailed explanation, thx a lot:)
@Easynimics6 жыл бұрын
Now ,it's very clear to me.Thank you sir..
@elghark6 жыл бұрын
Why does MGF start from the exponential function?
@mudanesomali2954 жыл бұрын
i
@bygrace65783 жыл бұрын
This is great!!! I'll recommend it to my fellow comrades.
@simonperez17066 жыл бұрын
Hi first of all thanks a lot for your videos! In the last example, why don't we take into consideration the 'after 3 year of use' ?
@fabianabrego62206 жыл бұрын
the function was in terms of three years.
@49riffinator3 жыл бұрын
@@fabianabrego6220 Thanks for this answer, was wondering the same then I re-read the question.