Luke is the most serious ice cream man I've ever seen. 😐🤔
@DrNic
3 жыл бұрын
Ice cream selling is a serous business. Those cones keep breaking and people try to pay with goats!
@RMatt2016
3 жыл бұрын
@@DrNic unfortunately, type of payment cant be measured with random variables!
@hongyunxu6018
5 жыл бұрын
Best explanations that I've seen so far, thank you!
@ASHOKKUMAR-jm6yn
5 жыл бұрын
I just love the way u make things easy.... Lots of love from India
@giselegiram
7 жыл бұрын
Great explanation, all your videos are really helpful. Go Statistics Learning Centre!! Thanks.
@Ferdinaand
6 жыл бұрын
Excellent explanation & animations. So necessary to solidify the basics to take things further.
@rishabhdude6750
9 жыл бұрын
this videos is fab and mam you teach awsome
@DrNic
9 жыл бұрын
rishabh dude I'm so glad you like it.
@lakshita1408
3 жыл бұрын
you explained it better in 4 minutes what my professors couldn't in hours. Thank you for simplifying the concept and making it interesting.
@DrNic
3 жыл бұрын
Glad it helped!
@rishi680
4 жыл бұрын
*My **B.tech** completed but did't undersatand little bit about random variable,but today i saw this video, and it seems it is too easy bcz of you only,thanks mam*
@DrNic
4 жыл бұрын
I didn’t understand either for years until I had to teach it. It really isn’t tricky, but somehow we just don’t get it
@naeemurrahman8767
7 жыл бұрын
Love your video and the method through which you've explained everything.
@DrNic
9 жыл бұрын
In order to make money we had to restrict access to some of the videos. Email me at n.petty@statslc.com and I'll give you access to the ones we have finished. The script for the video about the normal distribution has been written, so the video should be up in about a month.
@biggykwon9648
6 жыл бұрын
How did you find the value of P(X=x) . What did you do?
@Gia-Gia
3 жыл бұрын
Thanks for your lesson, it's very useful and easy to understand
@DrNic
3 жыл бұрын
Glad to hear that. I found the concept difficult when I first learned it, so I wanted to make it easier for other people.
@buglaudonglai9728
8 жыл бұрын
Great video! It helps me a lot.
@ajayhemanth
7 жыл бұрын
Amazing Video ! Best explanation for - WHY RANDOM VARIABLE is needed ... Thank you for taking pain to make such a fabulous video ...
@DrNic
7 жыл бұрын
Thanks - I had the same problem when I was first working out what a random variable was, so I'm glad it helps you.
@jimmyhaotran123
4 жыл бұрын
Great explanation. Just want to add that the first example of cakes and bananas, could be random variables if you assign specific numbers of each specific case.
@DrNic
4 жыл бұрын
You need to be careful how you phrase this. If you are counting how many cakes or bananas over several events then this could be a random variable. If you assign a code number such as 1 for cake and 2 for banana, then this is not a random variable.
@DrNic
4 жыл бұрын
@Semhar Yohannes You could have a random variable for the number of bananas or the number of apples. If you arbitrarily assign code numbers you cannot perform operations on them. One way I check is to say, would it make sense to find the mean cake? or the mean fruit? Your numbers 0 and 1 are not just code numbers, they are a measure of how many heads you have flipped.
@tsuki6230
8 жыл бұрын
Awesome video. Thanks
@leraheva8485
5 жыл бұрын
Great job on explaining Random vAriables.
@DrNic
5 жыл бұрын
Thanks - I've taught it quite a few times and know what makes it difficult for most people.
@MayankRamnani1802
7 жыл бұрын
Great Video! Can we assume that random variable concept comes under empirical probability (experimental) as the probability here is based on past outcomes (and events are clearly not equally likely) or it can be used under axiomatic approach also?
@DrNic
7 жыл бұрын
The concept of a random variable applies to all probability, regardless of the source of the model (experimental or theoretical/axiomatic/a priori. A binomial distribution is a theoretical model, as is a normal distribution. Sometimes data from historic values form a better approximation of the future than a theoretical model. You might like to watch our video, Probability 1 for a fuller description of that. Equal likelihood is not really an issue either way.
@akshatjoshi391
3 жыл бұрын
Thank you for not bringing in a fair coin. Video was very helpful :)
@DrNic
3 жыл бұрын
I hear you! So sick of coins, dice and balls in urns!
@REEMA-mo3hf
3 жыл бұрын
Such a great video thank you so much doctor Nick♥️♥️♥️♥️
@DrNic
3 жыл бұрын
You are so welcome!
@abhisheks5625
2 ай бұрын
Got the concept and the answers correct.
@DrNic
24 күн бұрын
That's great
@riddle-me-ruben
3 ай бұрын
Why is marital status not a random variable? If the sample space is married or unmarried, {M, N}, we can assign the random variable X to be 1 if the couple is married, and 0 if unmarried, so that X(M) = 1 and X(N) = 0, hence a Bernoulli random variable.
@somcana
2 жыл бұрын
qualitative variable are not considered random variables? Is that accurate understanding? I thought you can still do distributions with them but not probability?
@DrNic
2 жыл бұрын
You can call qualitative variables random variables, but at this level it's not much use as you can't use them in mathematical formulas etc.
@Lejhand10
3 жыл бұрын
well explained ! Thank you
@DrNic
3 жыл бұрын
Happy to hear it
@vijayashekhars.s9421
7 жыл бұрын
Nice Video..
@iidtxbc
4 жыл бұрын
Thank you for the video! I just wonder what could the sample space be for the ice-cream sales example?
@shamanthks7218
2 жыл бұрын
S = Number of ice creams bought by customers in a single visit. S = {1, 2, 3, 4, 5, 6}
@danielmwangi4308
6 жыл бұрын
The videos are of very good quality and very informative. They are a great resource for both learners and educators. Thank you.
@md.hasanuzzaman1956
5 жыл бұрын
Dr. Nic...Awesome...Magical explanation...Thank you so much
@suhadandis9383
7 жыл бұрын
Thank you
@xuanquangnguyen2291
4 жыл бұрын
So great video, thank you so much
@DrNic
4 жыл бұрын
You are so welcome!
@sattikbiswas2187
4 жыл бұрын
Awesome Video. Thank you so much ma'am.
@ajaykharat8689
5 жыл бұрын
Hi Dr. Nic, This is my first comment on KZitem. I found your entire series on statistics so easy to understand, crystal clear and engaging. I would like to thank you for :- 1. Great effort. 2. Nobel work. Thanking you on behalf of 1.35 billion Indian . You should have some teaching sessions in India. If possible try for it.. And lastly most important you are gorgeous...
@askariaziz4163
6 жыл бұрын
Thank you very much for the video it was so helpful in developing my understanding.
@Privacy-LOST
5 жыл бұрын
I was the 1000'th like for this video. How Random is that...
@naveenrajr1793
6 жыл бұрын
Thank you Mam
@JoJo-il3qe
5 жыл бұрын
Thanks it's so useful.pls share vdo about booles inequality
@johnnguyen3115
10 жыл бұрын
good
@ianjaydelosangeles3173
9 жыл бұрын
very well presented video! u earned a subscriber maam.
@abdulmateen0807
29 күн бұрын
May Allah bless you with Islam
@Professor91811
21 күн бұрын
Wtf
@ahmedmjhool4822
9 жыл бұрын
Cool Beans!
@Tlianscom
8 жыл бұрын
quit easy to understand even for beginner.. keep it Ma'am
@igniters5146
4 жыл бұрын
does play a certain lottery by buying one ticket per week a random variable?
@DrNic
4 жыл бұрын
The amount the ticket could win is a random variable.
@Privacy-LOST
5 жыл бұрын
How many cones can one get for a goat ?
@RushiLadani1995
6 жыл бұрын
but can we not measure the method that the customer is paying us in and their ethnicity. Can wealso not measure the type of topping that they choose ? I think we can.If I can, does that make them a discrete random variable ?
@DrNic
6 жыл бұрын
Things like the method and ethnicity are categorical measures that do not have a quantity associated with them. For example method would equal cash or credit card, and ethnicity would equal European, Asian, Pasifika etc. These are not numeric values, and thus are not random variables. We can record these values, but they are not something that has a numeric measure. You might like to watch our video about types of data to clarify this.
@maryamnizami7746
5 жыл бұрын
@@DrNic Hello maa`m, but won`t they become random values if we assign them a discrete value, like in case of coin toss our random variable becomes X={ 1 if heads, 0 if tails, now if we model the payment method in such fashion Y = {1 if credit card, 0 if cash , then will it become a random variable? Thanks
@vikasmeenaofficial
6 жыл бұрын
THANKS ......you are a great teacher
@giangnguyen-cp2vo
5 ай бұрын
thank you so much for helping me to understand these kind of things
@checilleabitria3356
6 жыл бұрын
very clear explanation! thanks a lot maam.
@k.c.krishna9570
5 ай бұрын
U helped me in my frm preparation.thankyou
@curiouscraw3927
3 жыл бұрын
I have discovered your channel minutes ago and already know that those brilliant lovely videos are going to help me survive my stochastics exam - thanks a lot and lots of respect for your work! I really appreciate the details in your videos - the dragon card game, the fact that the ice cream guy has a cochlear implant... amazing! Best wishes!
@DrNic
3 жыл бұрын
That is great to hear. We try to be inclusive of different ethnicities and wanted to include a disability - thank you for noticing!
@simran_kaur963
7 жыл бұрын
fabulous m glad i find your video
@venumadhavmenday132
2 жыл бұрын
Thank you, Dr. Isn't marriage status a random variable (binomial)
@venumadhavmenday132
2 жыл бұрын
I meant bernoulli
@DrNic
2 жыл бұрын
In most cases it would include married, never married, divorced, widowed, and then you get to civil union etc.
@vaibhavpratapsingh9956
Жыл бұрын
the answer of two people being married could be true or false so won,t we consider it as discrete random variable
@DrNic
Жыл бұрын
You could call it a nominal random variable if you were being very strict about it. However you cannot do any numerical operations with the value of married or not, so you would not usually call it a random variable.
@natdeu
7 жыл бұрын
Thank you so much for this video!
@srinivasp662
6 жыл бұрын
Thanks.
@shawnmarquez6714
4 жыл бұрын
you make me smirk
@shawnmarquez6714
4 жыл бұрын
yes sir!
@shaikabid5311
5 жыл бұрын
thank you mam
@mahmoudfathi8249
2 жыл бұрын
Finally I like statistics :D
@SatoshiBall
Жыл бұрын
Why can a marriage status not be modeled as a Bernoulli rv?
@DrNic
9 ай бұрын
Because there are multiple states - married, divorced, never married, widowed etc
@queensaharaice7376
6 жыл бұрын
250% better than Khan academy ad Wikipedia.
@DrNic
6 жыл бұрын
We like to think so! ;)
@rameshaafridi3050
6 жыл бұрын
amazing
@amenancoubourasidiki9219
7 жыл бұрын
cool
@tellmeyourwish
6 жыл бұрын
Thanks a lot! :)
@TheLordsForce
10 жыл бұрын
Wouldn't number 3 be discrete? Single, divorced, married.
@DrNic
10 жыл бұрын
At 0:19 we say that "a random variable is the result of a chance event that you can measure or count." Marital status does not have a meaningful numeric value, so using our definition, it is not a random variable. At this level, if we cannot perform calculations on the outcomes, then they are not random variables.
@TheLordsForce
10 жыл бұрын
So then if you said, marital statuses of a population, that would be a discrete random variable right?
@DrNic
10 жыл бұрын
You have to think about what one observation is. In most cases where we are interested in marital status, an observation will be one person. That person's marital status can only take categorical values, so we would not call it a random variable. (Though some people do talk about categorical random variables, we have chosen not to add that level of sophistication/confusion.) If an observation was, say, a household, and you wanted to know the number of married people in the household, then that would be a discrete random variable.
@TheLordsForce
10 жыл бұрын
Oh right! That makes sense. Thank you!
@masterzoruko9680
3 жыл бұрын
How did u get ur P(X=x)?
@rishabhrockstar5739
7 жыл бұрын
lovely
@Ryugaa007
2 ай бұрын
Checking marital status is not a random variable. .. why ??
@DrNic
24 күн бұрын
It is not a numerical random variable, which is the usual interpretation for a random variable.
@rishabhrockstar5739
7 жыл бұрын
lovely
@felizijaime1655
4 ай бұрын
That is the best explaination I´ve ever seen. Thanks!
@WishachieverZ
8 жыл бұрын
thank you so much for the help I understand now!! and if you are the one on videos your funny with your animations jaja. thank you
@douaahilali255
4 жыл бұрын
Thank you
@rashmir2534
4 жыл бұрын
Is it that, categorical variables are not random variables?
@DrNic
4 жыл бұрын
That is a very good question. Strictly speaking they are, but I didn’t realise that until years after making the video. You can’t really do much with them though, so this way of thinking helps more.
@GatewayTOEM
2 жыл бұрын
I got 7/7. This is because you explained it well.
@DrNic
2 жыл бұрын
Good for you. I think questions help people reinforce their learning
@richarddemeny611
9 жыл бұрын
Love it
@jeniferseighman
8 жыл бұрын
great vid fam
@PlacesWeveBeen
5 жыл бұрын
Very helpful explanation. Thank you!
@saeeduchiha5537
9 жыл бұрын
great video, except the "Coming Soon" videos never came!
@tidalfriction5301
2 ай бұрын
Savior!!! THANK YOU THANK YOU!!!!
@DrNic
24 күн бұрын
Most welcome
@littlelilly7480
Ай бұрын
for marital status we can use random variable right like for married 1 and for unmarried 0
@DrNic
24 күн бұрын
You could, except there are more categories than those and you can only use the number as an indicator, not a value.
@littlelilly7480
24 күн бұрын
@@DrNic thank you for clarifying it, such a unique way of teaching data science, love it
@hole01
2 жыл бұрын
Dr.Nic, Thank you very much. Just one question: I'm not sure if the number of ice creams ordered by a customer is random. Given that ice cream melts and most people would only buy one or two unless they were throwing a big party, I don't think this is a random situation. Could you please elaborate? I agree that this is a much more entertaining example than the traditional coin toss.
@DrNic
2 жыл бұрын
Mostly people buy one or two ice creams, but a family of four would generally want four ice creams. Having said that, that is not what random is about. A random variable can take a range of values and we have some idea about what values they can take and how likely the different values are. Random does not mean any number at all. THis might be useful: creativemaths.net/blog/random-meaning/
@minimaxPFC
5 жыл бұрын
You said that we can not use random variables to model the type that customer use to pay ice cream, but if we assign 1 if it's payed by cash, 2 payed with card, can we then use random variables?
@DrNic
5 жыл бұрын
Nope - the numbers do not mean anything, but are arbitrarily assigned. You cannot add them together, for instance.
@curiouspuzzles3098
9 жыл бұрын
When are the other videos coming up?
@ibrahimswaray7459
2 ай бұрын
Best explanation ever.
@DrNic
24 күн бұрын
Thanks
@irismo6566
2 жыл бұрын
very great explanation thx
@DrNic
2 жыл бұрын
Glad it was helpful!
@GerritParker
Жыл бұрын
So Awesome! Thank you.
@DrNic
Жыл бұрын
THanks
@mlem7108
3 жыл бұрын
Hi Dr Nic, Thanks for your videos. My lecturer said random variables are a mapping of all possible outcomes to real numbers. Can't we map stuff like colour or marital status to numbers? Like, marital status would be a Bernoulli trial (I think) and for colour we could use numbers to label them like Red Green Blue on a computer (another example of a continuous random variable?). Thank you very much.
@DrNic
3 жыл бұрын
Strictly speaking you can have nominal random variables, such as colour or marital status, but it is not usual to call them random variables. The point about random variables is that the numbers make sense, and that it makes sense to find, for instance, the mean or expected value of the random variable. If the numbers are arbitrarily assigned, they are not random variables. I'm not sure what your lecturer is referring to.
@amrabdelhakim1585
4 жыл бұрын
can you please explain why the color of a tulip flower is not a random variable?
@DrNic
4 жыл бұрын
Usually random variables take numeric values, whereas the tulip colour is not a number. If you had four tulips then the number of pink tulips out of the four would be a random variable.
@amrabdelhakim1585
4 жыл бұрын
@@DrNic In my sick mind I somehow assigned numbers to colors and wondered why are the colors not represented by a random variable. Thank you Dr. Nic
@eduardosa9658
4 жыл бұрын
Great work! Finally some basic explaination you can apply Statistics to gain some money in real thing and not to lose money in gamble statistics. :D
@DrNic
4 жыл бұрын
Glad it was helpful!
@z.r1999
3 жыл бұрын
OMG ...! Great video Mam
@DrNic
3 жыл бұрын
Thanks a lot 😊
@umadevi8125
5 жыл бұрын
Super teaching
@yuvaliko
7 жыл бұрын
great. thank you =]
@jhunnulal-b4j
Жыл бұрын
thankyou ma'am.
@DrNic
9 ай бұрын
Most welcome 😊
@xueyeelee4512
4 жыл бұрын
amazing explanation!!! im clearly understand what you are teaching in the video with a simple and interesting example!!
@DrNic
4 жыл бұрын
Glad it was helpful!
@043mehdi
6 жыл бұрын
4:44 hawking approves
@SuperDananjaya
3 жыл бұрын
Ma'am, you answered a number of questions, I was looking forward the answers for! Great!
@DrNic
3 жыл бұрын
Glad it was helpful!
@shaikabid652
4 жыл бұрын
Your underrated
@DrNic
4 жыл бұрын
Thanks. Tell your friends and maybe that will help me get more views.
@raghavmoar3211
4 жыл бұрын
Thanks for letting know what cannot be a random variable
@DrNic
4 жыл бұрын
Happy to help. Sometimes it is more important to know what a category excludes as well as what it includes.
@stephanie_ong
5 жыл бұрын
great video!
@mnhlhmo7967
4 жыл бұрын
Please answer my question Why we use the term (random variable), if we do a study we determine the variable of interest firstly (such as, body weight, blood pressure). So, what is the difference between (study variable) and the (random variable). Thanks in advance
@DrNic
4 жыл бұрын
I am not familiar with the term "study variable", but I can see what it means from what you are saying. I would say that study variables are random variables. But not all random variables are study variables. Random variable is a name for a concept. Ask some more if this is not clear yet.
@mnhlhmo7967
4 жыл бұрын
@@DrNic Thank you very much What I mean by (study variables) is in any study we collect data in term of variable (The characteristics we measure are called variables). Now, is there any difference between (study variables) and the term (random variable).
@DrNic
4 жыл бұрын
A study variable is a specific instance of a random variable. You collect data in the form of values that the variable takes in order to find a theoretical model for that random variable.
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