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“All my name is krishna and welcome to my youtube channel. Today. We will be be discussing about percentile and quantiles. So this is a very important concept guys again is basically related to statistics and machine learning this you need to understand because most of your distribution that we ll be seeing in your data set you have to refer percentile and quantile when you are doing statistical analysis.
So let me take. An example suppose you have a feature age sorry. Height. And suppose you have all these values like 168.
170. And these all are measured in centimeters. So here. You basically have 10 different values ok.
Now we will try to understand what exactly is percentiles to actually calculate percentiles first of all we have to take this dataset and sort it out. So. I have sorted out over. Here.
You can see. 150. 140. 150.
168. 170. 170. 175.
180. 182 and 190. Now. After sorting.
Okay. Let. Me consider this fifth number now you can see that i have 10 numbers totally right now if i take this fifth number. Which is my 170 value suppose.
This is my 170 value. I can be see we call this as 50th percentile again. I m saying guys 50th percentile not percentage. Ok percentage is completely different percentile is completely different if you have actually written cat exam.
Some gate exam at at that time you ll basically be seeing this particular term. Which is called as percentiles now let me explain you what this exactly means. Now. Suppose.
The fifth student has got 170 marks right so in this particular distribution of only 10 students..
So i can call this particular person as getting 50th percentile. Which indicates that 50 percentage of the values are less than 170. Okay. 50.
Percentage of values are basically less than 170 and 50 percentage of values are greater than 170. Okay. This is what basically indicates. Now suppose.
If i want to calculate the 90th percentile. So this is basically my 90th percentile. This basically indicates that 90 percentage of values are less than 182 value okay. 182 score and 10 percentages are basically greater than 180 to score now when i say 50 percentage of is are less that basically means from this distribution.
Okay. There s not other distribution. This distribution based on the sample that you have over here. If you are getting a 50 percentile value of 170 you are basically treating it as that 50 percentage of people are basically having less number than this particular value that is 170.
Okay now this is a simplest explanation guys i hope you want your understanding it now where we will be using it we will be using basically to do a lot of statistical analysis. That again. I m going to show you in the upcoming videos now we are going to understand what exactly is quantiles now see guys from this particular distribution. If i get the value as 25 percentiles.
Some value 58 percent and some value 75 percentile some value and finally 100 percentile..
Some value first of all what does this basically mean this basically indicates that 25 percentage of your value or in this particular distribution. Get less than this particular value right whatever value. I ve got for 25 percentile. Similarly in this case.
50 percentage of our values over here in this distribution on lesser than this particular value. What you are getting for 58 percent. That similarly in the case of 75 percentile 100. Percent.
This values are basically called as quantiles. Now. How do you call this as quantile. This is basically called as a first one time second quantile third quartile and finally a fourth one time so quickly.
If i want to mention that tell me the third quartile in this particular distribution. I have to basically refer at the 70th percentile. So if you have 100 to one 200 percentile at that time that are basically divided by 4 values. Because quant specifies 25.
Percentile. So the difference between all this particular value you can see that the difference between 50 percentile and 25. Percentile. Is 25.
75. Around 50 percent l. Is. Again 25 100.
Percent. And 75 percent l. Is again 25. So this was all about this videos.
Regarding percentile and contents. Again guys. What is the right application of this i am going to explain you in the upcoming videos. I hope you liked this particular videos please make sure to subscribe the channel share with all your friends.
I ll see y all. In the next. Video have a great day. Thank you one and all ” .
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