I appreciate your your way of teaching 🔥🔥 And request you to plz provide notes of your video Lecture for that plz let us know , where we can find this valuable notes😁 Plz reply asap regarding the same like is it possible for you or not in such hectic schedules and pressure , I'll wait for your reply ☺
At the beginning of each video, volume should be minimized, as it irritates ears. Actually your personal volume is low as compared to the introductory part of each video.
The Intro really destroys my ears (@2x) right before examinations :)
The intro is very peaceful if it is listened to normally :)
13- Correlation Analysis - Pearson's Correlation Coefficient
used to measure the relationship between two variables
Ƴ(A,B) aka (gamma A,B) is Karle Pearson's correlation coefficient
_ _
Ƴ(A,B) = Σ [(A - A) (B - B)]
-------------------
(n - 1) (σA) (σB)
_ _
A B : A bar, B bar : the mean of A and B
σA σB : sigma A, sigma B : the standard deviation of A and B
Ƴ (gamma) may contain three values (0, -1, +1)
Ƴ as 0 -> no correlation (no dependencies)
Ƴ as -1 -> perfect negative correlation
Ƴ as +1 -> perfect positive correlation
example:
A B
--- ---
20 8
12 34
9 4
1- calculate the mean of A and B
_
A = (20 + 12 + 9) / 3 = 13.66
_
B = ( 8 + 34 + 4) / 3 = 15.33
2- calculate sigma a and sigma b
_
σA = sqrt ( (Σ (A - A)^2) / n-1 )
= sqrt ( ((20 - 13.66)^2 + (12 - 13.66)^2 + (9 - 13.66)^2) / 2 )
= sqrt ( ( 6.34^2 + -1.66^2 + -4.66^2) / 2 )
= sqrt ( ( 40.1956 + 2.7556 + 21.7156) / 2 )
= sqrt ( ( 64.6668 ) / 2 )
= sqrt ( ( 32.3334 ) )
= 5.68.....
_
σB = sqrt ( (Σ (B - B)^2) / n-1 )
= sqrt ( (( 8 - 15.33)^2 + (34 - 15.33)^2 + (4 - 15.33)^2) / 2 )
= sqrt ( ( -7.33^2 + 18.67^2 + -11.33^2) / 2 )
= sqrt ( ( 53.7289 + 348.5689 + 128.3689) / 2 )
= sqrt ( ( 530.6667 ) / 2 )
= sqrt ( ( 265.33335 ) )
= 16.29.....
n (number of tuples in the database) tuple = record = row (in this case, n=3)
so now: ( I tried!! )
_ _
Ƴ(A,B) = Σ [(A - A) (B - B)]
-------------------
(n - 1) σA σB
= [ (20 - 13.66)( 8 - 15.33) + (12 - 13.66)(34 - 15.33) + ( 9 - 13.66)( 4 - 15.33) ]
----------------------------------------------------
(2) (5.68) (16.29)
= [ (6.34)(-7.33) + (-1.66)(18.67) + (-4.66)(-11.33) ]
----------------------------------------------------
(2) (5.68) (16.29)
= [ (-46.4722) + (-30.9922) + (52.7978) ]
----------------------------------------------------
185.0544
= -24.6666 / 185.0544
= -0.1333....
.
Mam I got( -0.133)
we have Electronic sensors exam on 18th of this month, which is supposingly tough, can you help us out with it
why standard deviation formula has 'n-1' in denominator? it should be 'n' right?
for Sample Data We used n-1 instead of N
Today😂 at 2pm thank you very much i could understand easily
My exam is from 10am today, and I'm watching your video at 6:47am 😂
Mam please make playlist for software process and project management (sppm) jntuh
make videos on FUNDAMENTALS OF BIOMEDICAL APPLICATIONS
Please explain the cloud computing .I have exam on 14
Jntuh
can you recheck your calculations please , am getting -0.1 , how can it be -1
eah i got the same
similar like you
Midsem ..can you kindly make a sample question set
Mam can you please explain normalization with z score, min max and decimal scaling our exam is from 12th sep 2022
0:35 Exam is in one hour...
I appreciate your your way of teaching 🔥🔥
And request you to plz provide notes of your video Lecture for that plz let us know , where we can find this valuable notes😁
Plz reply asap regarding the same like is it possible for you or not in such hectic schedules and pressure
, I'll wait for your reply ☺
2maro I have exm tqs for making thi s videos
Mam please can you do playlist for ids introduction to data sicence
Regression ki bhi video bna do mam pllz
wrong formula, it should be n-1 in both formlas: standard devition and pearson coefficient, please correct it
Please make sppm subject videos mam...exam in 5 days
Today is exam ma'am please please make a Good Video ma'am on ETL Logics and tools
:) please
please check your calculation of 6b=265 not16.28
Konchem sppm(software procees & project management) kuda cheyavachhu kada playlist
At the beginning of each video, volume should be minimized, as it irritates ears. Actually your personal volume is low as compared to the introductory part of each video.
Mam my exam is in 3 of June 2022 can, please give me imps , or any thing else in this subject
tomorrow is our exam
Date:- 26 april 2023
Exam ayipoyindhi ma friend exam ayaka suggest chesthe chusthunna supply ki 😂
tomorrow (2-march-2024) at 10:00 AM
my exam is today at 4pm plz fast
tomorrow😁😁
isnt that value 0.877? bcoz i did and got that ans and if it is 0.87 then should we consider 0 or +1?
the answer is somewhere around -0.1 hence we are considering it to be negative
Tomorrow 🤣🤦
3 March exam of dw
Xm from 14march
8 june
Wrong formula 😢
tomorrow😭 is my exam
Rip
today 😂😂😂
16 Feb sicet
11th dm exam
Do as soon as positive 11 feb exam data mining jntu Hyderabad exam do before 11 feb fast do like artificial
Don't teach so much fast plz