I remember seeing this video back in High School. Now many years later, I watch it again for my major related classes. Awesome work
@paolototaro650 Жыл бұрын
Great video! I think it's important for the viewers of this video to mention the idea of proportional allocation, which we need in stratified random sampling. Basically in this example when doing stratified random sampling as you can see the proportion of men in the population 40/100 is the same as the one in the sample 4/10 (both results give 0.4) ; same holds for the women which are 60/100 in the population and 6/10 in the stratified sample. If we have the population proportion and we want to know how many men we will need in the sample we use the formula ni = (Ni/N)*n where N is the populaion size, n is the sample size and i is the strata (ex: men). So in our example if we want to get the number of men for our sample we will compute ni = (60/100)*10, which will be indeed equal to 6.
@nokia87072 жыл бұрын
great video very clearly explained the concept in less than 5 minutes. Rahul you're a legend.
@doriancorrea2554 Жыл бұрын
You just saved my quarter 2 grade in my AP Statistics class. Thank you so much!
@skateata18 жыл бұрын
the different colors help so much
@iLoveTurtlesHaha7 жыл бұрын
hum, it's so easy when you explain it so well. :)
@spongebobby1885 жыл бұрын
So clearly explained! Great job 👍
@dyirbeeek2 жыл бұрын
Thank you this video! I watched several videos but this one is the best!
@user-rm7eh4sb4d2 жыл бұрын
truth man
@hangnganguyen2684 жыл бұрын
This is so helpful. Thank you!
@wolfyloves2play4523 жыл бұрын
How do present data in stratified sampling
@91dikon5 жыл бұрын
this is wonderful. thank you!
@Moon-rq5vb9 ай бұрын
Why do the book have a different strata? Damn I am stressed ToT.... I need to rush everything...
@drumilmodi977811 ай бұрын
Thanks man great video on the topic.
@gary1236226 жыл бұрын
stratify the groups so group them men and women for example and you divide them into 2 groups and these groups are called strata so 40 women you choose 4 women and 60 men so 6 men and this is a simple random sample and then you will have 3 different samples which are always 4 women and 6 men so from the strata you choose a simple random sample and then you bring both simple random samples together to make a stratified random sample
Could anyone help me to answer this question please? . How does stratified method generate simple random samples? I get a bit confused at the "Stratified sample" method It doesnt sound that we are making random samples because if we break the population into smaller groups and pick randomly, for example we have 5 levels of education and each level is one subgroup, then we prioritize to have samples which include all levels of education. It means that you miss out samples which maybe only contains 4 or 3 levels of education. In the beginning, we have a very clear definition for " a simple random sample is EVERY SET OF n individual has an equal chance of being sampled", in the stratified sample we dont let every set has an equal chance of being sampled.
@ricardog44594 жыл бұрын
my understanding is that the attribute that you are interested in studying and the attribute to stratify are different. Say that you want to study the distribution of height, then you stratify education and study height as a random variable. At least that's how I am applying stratification, I am not so interested in that attribute but in another one, but I cannot study the whole data, so I take a stratified sample to keep it representative of the population
@movies_reload3 жыл бұрын
@@ricardog4459 I have a doubt can you help me. pls. Does stratum means the sample selected from the strata.🙄 Pls help me
@ricardog44593 жыл бұрын
@@movies_reload Yes. That's my understanding. You stratify the data on, say, property 1, and randomly select from each strata of property one, data with the property 2. But I would say better ask your teacher at school, he should be able to give you a better explanation and an example. cheers
@AawhanKafle2 жыл бұрын
we need to classify the population based on specific class and find the constituting ratio, then for sample units we select based on population ratio and sample size. for question @thiduyen asked, lets suppose there are 1000 students in our population and their are five level of education and 200 in each different level of education then we first need to stratify levels and no of students i.e level 1 200 , level 2 200 , level 3 200, level 4 200 and level five 200, this gives us the ratio 200:200:200:200:200(that is 1:1:1:1:1). that means our sample should have same number of sample units from each strata. let us say we have sample size of 25 then 5 students is selected from level 1 randomly, it is done by randomly sampling five students from strata of 200 level 1 students, similarly 5 students is selected from level 2 by randomly sampling five students from strata of 200 level 2 students and so on. here the sample ratio is 5:5:5:5:5 (that is 1:1:1:1:1) so it is a better representation of the population.
@arihoeliab78314 ай бұрын
Good work!
@user-zq1yv9ii2p Жыл бұрын
how do u get the number of people who do /not smoke?
@mohamedeesakadwa1091 Жыл бұрын
How do you calculate the number of strata?
@leah18638 жыл бұрын
Good example. Very clear.
@aathiramarayil4 жыл бұрын
This is easy to understand. Thank you
@trigo9733 жыл бұрын
I love your penmanship wowww
@rizmandesu2 жыл бұрын
thank you, the explanation is very clear
@user-bh4ec7cf4w2 ай бұрын
Love this little cigs 😂
@mohamedmahmoudgharbya4509 Жыл бұрын
you are great ♥
@waseemzaman43003 жыл бұрын
this is not stratified random sampling but quota sampling. correct me if am wrong
@jpoysvlog8962 Жыл бұрын
This is what i want, there's have a drawing to formulate the sample.
@nicolezink82613 жыл бұрын
Super helpful, thanks for sharing 🙏
@prapsdy5 жыл бұрын
So how did you decide on the ratio of 6:4?
@alienfromouterspace54255 жыл бұрын
hello, so i am not sure myself, i actually had the same question as you and then i thought maybe it was like this , like we have 40 women and 60 men so the whole population is 100 and we need 10 out of these so out of 40---->x and 100----->10 so if we (40*10)/100 we'd get (x= 4) , same for 60----->x, 100---->10 so if we (multiply 60*10)/divide it by 100 we'd get (x=6) , i hope this is correct
@welovemusic85422 жыл бұрын
Randomly?
@ness_cek3 жыл бұрын
this is so easy to understand, thanks heaps!
@movies_reload3 жыл бұрын
I have a doubt can you help me. pls. Does stratum means the sample selected from the strata.🙄 Pls help me
@khaibaromari8178 Жыл бұрын
@@movies_reload I hope you've already figured the answer out by the time you read this reply. Well strata is the plural form of stratum which is obviously is a noun. Multiple stratum is called strata. In field of sampling stratum means a layer (to be more spesific a spesification) that you can divide your population based on. It could be sth like gender, age groups, race, country of origin, and so on. To have higher rate of representativity in your sample you may use stratification to draw your sample randomly from each of your stratum.
@jonathanbower8632 жыл бұрын
So good
@ttremms5 жыл бұрын
Really helpful! thanks!
@NocheFluorescente4 жыл бұрын
Thank you ! Very Clear !
@isabelginazodwaogwal95463 жыл бұрын
Thank you!
@ndizeyeimananiyonkuru2334 жыл бұрын
Thanks alot my facilitator
@kevinkamba-comestay37065 жыл бұрын
Amazing ! thanks
@funnydikhao11793 жыл бұрын
It may be understood in bilingual mode or in Hindi
@45zharelmarpha8 жыл бұрын
Thank you. :-)
@suriyanshankar20175 жыл бұрын
Thank you so much
@its.the_none2 жыл бұрын
Arigathanks gosaimuch for this?
@edithmambiri70894 жыл бұрын
Thank you
@farzananaved78577 жыл бұрын
Thanks a lot.
@baindlavamshikrishna55563 жыл бұрын
This one was Better way of understandable
@movies_reload3 жыл бұрын
I have a doubt can you help me. pls. Does stratum means the sample selected from the strata.🙄 Pls help me
@giovannithegreat8119 Жыл бұрын
@@movies_reload Stratum Is the plural form of strata
@aymansaid12535 жыл бұрын
Thank
@trueexpression4 жыл бұрын
mrs hannah
@shinellmontgomery37933 жыл бұрын
Still don't get it
@bottlebrush48244 жыл бұрын
Is it just me or is most of the people in the comments section, Indian?
@jpoysvlog8962 Жыл бұрын
This is what i want, there's have a drawing to formulate the sample.