Why multicollinearity is a problem | Why is multicollinearity bad | What is multicollinearity

  Рет қаралды 37,071

Unfold Data Science

Unfold Data Science

Күн бұрын

Пікірлер: 162
@swatikute219
@swatikute219 3 жыл бұрын
If x1 and x2 are strongly correlated then we should check their individual correlation with target and will select the variable which is highly correlated with target and can also check p value for the variables.
@UnfoldDataScience
@UnfoldDataScience 3 жыл бұрын
Correct. Thank you.
@rizalrifai6010
@rizalrifai6010 Жыл бұрын
whats p value ?
@sanjeevkmr5749
@sanjeevkmr5749 3 жыл бұрын
Thanks a lot for the detailed discussion on this topic. For the question asked in the video(Which feature to be removed incase of high correlation), I guess among the two, we have to remove the one which least contributes(less correlated) with the target variable. In that way, we will be able to preserve the feature which has high contribution.
@UnfoldDataScience
@UnfoldDataScience 3 жыл бұрын
Thanks Sanjeev. True.
@babareddy44
@babareddy44 3 жыл бұрын
How do we know which contributes least, help?
@arslanshahid3454
@arslanshahid3454 2 жыл бұрын
@@babareddy44 from R2, F- value or p- value?
@beautyisinmind2163
@beautyisinmind2163 Жыл бұрын
@@babareddy44 you can use random forest model to see the significance of feature that contribute the most
@koustavdutta1176
@koustavdutta1176 3 жыл бұрын
Firstly great explanation !! Now coming to your question, we have to check the bi-variate strength between dependent variables with independent variables. The independent variable with weakest strength should choose to remove from model
@UnfoldDataScience
@UnfoldDataScience 3 жыл бұрын
Awesome. Thank you. :)
@jamiainaga5853
@jamiainaga5853 3 жыл бұрын
what is bi- viariate?
@sowsow5199
@sowsow5199 2 жыл бұрын
@@jamiainaga5853 the two variables that have been found to be highly correlated with each other
@kavankomer3048
@kavankomer3048 Жыл бұрын
How to find this bi-variate strength?
@samruddhideshmukh5928
@samruddhideshmukh5928 3 жыл бұрын
Simple, Clear and Amazing explanation!!! I think we can remove one of the columns seeing the p value. If p>0.05 then we fail to reject the Null hypothesis for that variable and thus that coefficient value will be equal to 0.Hence that variable will not contribute significantly. Sir pls do make a video on how to use Ridge-Lasso regression to handle multicollinearity.
@UnfoldDataScience
@UnfoldDataScience 3 жыл бұрын
Thanks Samruddhi, Videos u asked: kzbin.info/www/bejne/bYnZc6qHmrlshas kzbin.info/www/bejne/aGK3mH6erpZ6j5Y
@dariakrupnova6245
@dariakrupnova6245 3 жыл бұрын
Wow, I think I owe you my mark on the Econometrics final, you blew my mind, I had no idea it was so simple. Thank you!
@umeshrawat8827
@umeshrawat8827 Жыл бұрын
To omit either X1 or X2, we can use PCA and remove the variable with low variance.
@akashchatterjee7678
@akashchatterjee7678 8 ай бұрын
Why with low variance
@swatikute219
@swatikute219 3 жыл бұрын
Amazing pace, crisp word selection and good examples, thank you Aman for great videos !!
@UnfoldDataScience
@UnfoldDataScience 3 жыл бұрын
Thanks Swati.
@sangeethasaga
@sangeethasaga 9 ай бұрын
Never seen someone with such a clear understandable explanation...thank you so much!
@Bididudy_
@Bididudy_ Жыл бұрын
Thank you for detailed explanation. I tried this concept from other channels but was bit difficult to get it. Your way of explaining terms is very simple and which helps to understand subject. Really glad that i visited your channel.👍
@UnfoldDataScience
@UnfoldDataScience Жыл бұрын
Thanks Bala. Keep learning
@datapointpune6216
@datapointpune6216 3 жыл бұрын
Very Informative aman
@UnfoldDataScience
@UnfoldDataScience 3 жыл бұрын
Thanks a lot.
@ChenLiangrui
@ChenLiangrui 5 ай бұрын
awesome video! very clear and beginner friendly, no broken train of thought, very problem-focused
@UnfoldDataScience
@UnfoldDataScience 5 ай бұрын
Glad you liked it!
@jhonatangilromero2311
@jhonatangilromero2311 Жыл бұрын
It is evident that a lot of work goes into developing these very informative videos. Thank you!
@KidsRiddleFun
@KidsRiddleFun 3 жыл бұрын
best explanation....keep the good work up.
@UnfoldDataScience
@UnfoldDataScience 3 жыл бұрын
Thanks a lot.
@shahbazkhalilli8593
@shahbazkhalilli8593 7 ай бұрын
I don't know which one should I take. By the way video is great
@abdulhaseebshah9109
@abdulhaseebshah9109 2 жыл бұрын
Amazing Explanation Aman, I have a question that VIF and auxiliary regression both use to detect multicollinearity?
@KastijitBabar
@KastijitBabar 6 ай бұрын
The best explaination on whole KZbin! Thank You.
@datafuturelab_ssb4433
@datafuturelab_ssb4433 3 жыл бұрын
Great explaination sir . Thanks for sharing and making my fundamentals strong
@UnfoldDataScience
@UnfoldDataScience 3 жыл бұрын
Most Welcome.
@shadow82000
@shadow82000 3 жыл бұрын
If X1, X2 have high correlation, can I choose to drop the X with lower correlation to Y? Based on the correlation matrix
@UnfoldDataScience
@UnfoldDataScience 3 жыл бұрын
Yes Right.
@shadow82000
@shadow82000 3 жыл бұрын
@@UnfoldDataScience Thank you kind sir. High quality content as always!
@carlmemes9763
@carlmemes9763 3 жыл бұрын
👍❤️
@sudhirnanaware1944
@sudhirnanaware1944 3 жыл бұрын
Hi Aman, As per my knowledge we can use VIF (Variation Inflation Factor) function, heatmap,Corr() function to remove the multicoliniarity. Please confirm another techniques
@UnfoldDataScience
@UnfoldDataScience 3 жыл бұрын
Yes Sushir, apart from some other regression techniques can be used.
@sudhirnanaware1944
@sudhirnanaware1944 3 жыл бұрын
Thanks Aman, may I know the regression techniques to remove multicoliniarity. so I will definitely learn this and it will helpful for me.
@csprusty
@csprusty 3 жыл бұрын
We can create and compare two models based on choosing each of the correlated explanatory variables one at a time and select the model having better R-squared value.
@kunalchakraborty3037
@kunalchakraborty3037 3 жыл бұрын
My question.. 1. Is multicollinearity a concern for predictive modeling. I mean the prediction is altered by neglecting this phenomenon or not. 2. In case of GAM do we have to worry about multicollinearity. 3. How collinearity inflates the variation.
@UnfoldDataScience
@UnfoldDataScience 3 жыл бұрын
Thanks Kunal for asking it. Answer to first question is prediction will not be impacted more however eoefficoents will be impacted. 2nd and 3rd, I will. Cover in other video
@kunalchakraborty3037
@kunalchakraborty3037 3 жыл бұрын
@@UnfoldDataScience thanks 👍. Really appreciate your videos.
@faozanindresputra3096
@faozanindresputra3096 Жыл бұрын
is multicollinearity will be problem too in correlations? just focus on getting which variables that correlate, not focus on regression. like in PCA
@nurlanimanov9503
@nurlanimanov9503 3 жыл бұрын
Hello sir! Firstly thank you for the video! I have 2 questions if you answer I will be glad: 1) Can we say that we don't need to be concerned about correlated features in for example decision tree-based models? I mean do we need this concept only in linear-based models? 2) Don't we need to touch correlated features when we use Lasso or Ridge regression is that true? Will the model do that by itself in that case? Don't we need to touch?
@UnfoldDataScience
@UnfoldDataScience 3 жыл бұрын
1. This is a problem with regression based models where coefficients come into picture. 2.still you need to take care.
@hemanthkumar42
@hemanthkumar42 3 жыл бұрын
@@UnfoldDataScience from you first answer, then why multicollinearity is not a problem in neural network? Pls make a video regarding this sir...
@saurabhagrawal9874
@saurabhagrawal9874 2 жыл бұрын
@@hemanthkumar42 Note that multicollinearity does not affect prediction accuracy of the linear regression ,it only make the interpretation harder in the linear regression and mostly for interpretation we go to linear regression and when we go to neural network we already know its type of blackbox and we dont want to interpret ,but want good prediction results ,thats why we dont bother about multicollinearity in neural network
@smegala3815
@smegala3815 Жыл бұрын
Thank you sir... Best explanation
@UnfoldDataScience
@UnfoldDataScience Жыл бұрын
Most welcome
@arshiyasaba2259
@arshiyasaba2259 2 жыл бұрын
If value is less then thresholds value 0.5/0.7 as per the reference suggests. Then we can remove those values
@shanmukhchandrayama8508
@shanmukhchandrayama8508 3 жыл бұрын
Aman, Your videos are great. But there are many videos which have some connection with other, so can you please make a video in which you can say which order to follow the playlists to learn the machine learning from basics. It would be really helpful😅
@UnfoldDataScience
@UnfoldDataScience 3 жыл бұрын
Noted. Thank you for suggesting.
@datafuturelab_ssb4433
@datafuturelab_ssb4433 3 жыл бұрын
Remove the variable which have low impact on target variable... Sir I hv 2 question 1. If there is multicollinearity in Classification problem. How to handle that 2. What is VIF & how standardization done 3. Can we use standard scaler in regression problem
@UnfoldDataScience
@UnfoldDataScience 3 жыл бұрын
There are three questions, I will cover them in separate video. Thanks for asking.
@MuhammadImran-o4c
@MuhammadImran-o4c 3 жыл бұрын
Sr ap ko js ne jo answr dia he sb ka answr correct he ap sb ko yes bol rhen hn
@UnfoldDataScience
@UnfoldDataScience 3 жыл бұрын
Moslty answers are correct only.
@roshinidhinesh5490
@roshinidhinesh5490 3 жыл бұрын
Such a great explanation sir.. Thanks a lot!
@UnfoldDataScience
@UnfoldDataScience 3 жыл бұрын
Thanks Roshini.
@YourRandomVariable
@YourRandomVariable 3 жыл бұрын
Hi Aman, What should we do when the constant term p-value is high? Mostly I see that people keep it without worrying about it. Could you please give an explanation for this?
@allaboutstat1103
@allaboutstat1103 3 жыл бұрын
thanks for clear explanation and God bless!
@UnfoldDataScience
@UnfoldDataScience 3 жыл бұрын
Welcome.
@AMVSAGOs
@AMVSAGOs 3 жыл бұрын
Great Explanation... At 7.50 you said "that's why we should not have multicollinearity in regression" . So, Is it okay if we have multicollinearity in classification?? Could you please make it clear..
@UnfoldDataScience
@UnfoldDataScience 3 жыл бұрын
When I say, it means regression family of Algorithms. Logistic regression also.
@AMVSAGOs
@AMVSAGOs 3 жыл бұрын
@@UnfoldDataScience Thank you Aman Sir
@nivednambiar6845
@nivednambiar6845 9 ай бұрын
Hi Aman, hope you are doing well ! I want to ask one thing, what you are mentioning regression models is related to linear models right not the tree based regression models am i correct ? does multicolinearity effects the tree based models ?
@shivamthakur4079
@shivamthakur4079 3 жыл бұрын
really loved sir what u said i can say that u have great idea of explaining concepts. i can blindly follow u sir
@UnfoldDataScience
@UnfoldDataScience 3 жыл бұрын
Thanks Shivam.
@ShubhamSharma-zb9uh
@ShubhamSharma-zb9uh 3 жыл бұрын
09:11 The Data which More Coefficient Value that we have to consider for analysis.
@manavgora
@manavgora 10 ай бұрын
great, easily understandable
@RamanKumar-ss2ro
@RamanKumar-ss2ro 3 жыл бұрын
Great content.
@UnfoldDataScience
@UnfoldDataScience 3 жыл бұрын
Thanks a lot.
@ugwukelechi9476
@ugwukelechi9476 2 жыл бұрын
You are a great teacher! I learnt something new today.
@UnfoldDataScience
@UnfoldDataScience 2 жыл бұрын
Pls share within data science groups
@prateeksachdeva1611
@prateeksachdeva1611 2 жыл бұрын
we will drop that feature from the model whose correlation with the dependent variable is lesser as compared to the other one
@muhammadaliabid5793
@muhammadaliabid5793 3 жыл бұрын
Thankyou for excellent explanation. I have fews questions please: 1. I used Polynomial features method in sklearn and it significantly improved accuracy of my linear regression prediction model, but i found that the newly created features are correlated with the existing features since i created square and cubes! I understand as per your explanation that it will lead to multicollinearity problem! So i understand that the coefficients are not the true picture, However can i use this type of model for predictions? 2. What would you suggest the threshold correlation value for multicollinearity? Thanks
@mariapramiladcosta1972
@mariapramiladcosta1972 3 жыл бұрын
Sir if the there are 3 predictors and one dependent variable. all the three independent variables are highly correlated then which type of regression model can be used. multiple regression can not be used rt?can we use the linear regression? can the tolerance of .1 and the VIF less than 10 not a good enough to indicate that there is no multicollinearity? for your question i think the one with weak correlated one to be removed
@anmolpardeshi3138
@anmolpardeshi3138 3 жыл бұрын
regarding the question- which variable to remove out of a set of highly correlated variables? Can this be answered by PCA (principal component analysis)? or will the PCA weight them the same because they are highly correlated?
@UnfoldDataScience
@UnfoldDataScience 3 жыл бұрын
Hi Anmol , not in terms of pca, generally I asked.
@hakimandishmand1068
@hakimandishmand1068 2 жыл бұрын
Good and perfect
@UnfoldDataScience
@UnfoldDataScience 2 жыл бұрын
Thank you
@kar2194
@kar2194 3 жыл бұрын
Sorry so it means when there is multicollinearity for example x2 and x3, so if I increase x2, x3 will automatically increased? Great video by the way!
@UnfoldDataScience
@UnfoldDataScience 3 жыл бұрын
internally at some level yes. tq
@zakiaa7464
@zakiaa7464 Жыл бұрын
You are a genius. Thanks
@bijaynayak6473
@bijaynayak6473 2 жыл бұрын
which one will eliminate ? VIF of each features set the threshold >5
@sriadityab4794
@sriadityab4794 3 жыл бұрын
Should we need to remove multicollinearity while building time series model?
@UnfoldDataScience
@UnfoldDataScience 3 жыл бұрын
Not necessarily.
@atomicbreath4360
@atomicbreath4360 3 жыл бұрын
Sir can given some ideas on how to know which type of ml models is affected by multicollinearity?
@UnfoldDataScience
@UnfoldDataScience 3 жыл бұрын
Regression based model
@ethiodiversity-1184
@ethiodiversity-1184 2 жыл бұрын
great explanation
@UnfoldDataScience
@UnfoldDataScience 2 жыл бұрын
Thank you 🙂
@nurlanimanov9503
@nurlanimanov9503 3 жыл бұрын
Hello sir, After reading the comments I saw the answer to your question. They said we have to remove the one which has less correlation coefficient with the target variable due to the correlation matrix. It confused me at one point, Can we say that the coefficients in front of each feature that we get after running the regression model indicate us impact of each feature on the target? So, I mean can I take these coefficients when I decide which feature I have to remove bw two correlated features instead of taking correlation matrix value with the target variable? Can we say that the coefficients in front of each feature actually say the same thing as the value in the correlation matrix with the target variable in this context?
@suryadhakal3608
@suryadhakal3608 3 жыл бұрын
Great.
@UnfoldDataScience
@UnfoldDataScience 3 жыл бұрын
Thanks Surya.
@salajmondal3437
@salajmondal3437 8 ай бұрын
Should I check multicolinearty for classification problem?
@UnfoldDataScience
@UnfoldDataScience 8 ай бұрын
For logistic regression - yes.
@salajmondal3437
@salajmondal3437 8 ай бұрын
@@UnfoldDataScience Is it necessary to check multicollinearity between categorical features or numerical and categorical features??
@bhavanichatrathi7435
@bhavanichatrathi7435 3 жыл бұрын
Hi Aman it's very good explanation...please do video on penalised regression like lasso ridge and elastic..too much of mathematics into those please explain in simple way Thank you
@UnfoldDataScience
@UnfoldDataScience 3 жыл бұрын
Thanks Bhavani, Sure will do,
@rafibasha4145
@rafibasha4145 2 жыл бұрын
Multicolinearity is problem in classification as well right .@3:57
@UnfoldDataScience
@UnfoldDataScience 2 жыл бұрын
Yes, if it's a linear model like logistics regression.
@harshadbobade2200
@harshadbobade2200 2 жыл бұрын
Simple and to the point explaination 🤘
@UnfoldDataScience
@UnfoldDataScience 2 жыл бұрын
Thanks Harshad.
@sharadpkumar
@sharadpkumar 2 жыл бұрын
Hi Aman, nice work, keep it up.....i have a doubt that why normal distribution is so important? why we need our independent variable should show normal distribution for a good model? i am not finding a satisfying answer. can you please help?
@UnfoldDataScience
@UnfoldDataScience 2 жыл бұрын
Hi Sharad, in simple language, its easy for the model to learn pattern if you give examples from a large set of range.(That is your normal distribution). Take a example below: Predict salary of an individual(Y - target) based on his/her expense(X variable) Scenario 1 - in your training set you have Y as - 10LPA, 15LPA,20LPA, like that, here model wont be able to learn the pattern for 3LPA guys, may be there is difference is income/expense pattern for junior guys. Scenario 2 - You give many values of Y from all over like 2LPA, 4LPS,5LPA,100LPA, all values like they are normally distributed. Here its easy for model to learn pattern as it sees a range of values and the resulting model will be more reliable. Hope its clear now.
@sharadpkumar
@sharadpkumar 2 жыл бұрын
@@UnfoldDataScience thanks for clarification . Does a huge dataset always show normal distribution?
@UnfoldDataScience
@UnfoldDataScience 2 жыл бұрын
No, not always...it depends on data
@ashulohar8948
@ashulohar8948 2 жыл бұрын
Please please make a vedio how to select drivers in linear regression which drive the sales
@RAJANKUMAR-mi1ib
@RAJANKUMAR-mi1ib 3 жыл бұрын
Hi...Thanks for the nice explaination. Have a question that is multicollinearity a problem for linear regression only? if not then how its a problem for non-linear regression?
@UnfoldDataScience
@UnfoldDataScience 3 жыл бұрын
For regression based models like linear/logistic etc
@sidrahms7458
@sidrahms7458 3 жыл бұрын
Awesome explanation, I have a question: if I have nominal,ordinal and continuous variables how can I find multicollinearity among them?
@UnfoldDataScience
@UnfoldDataScience 3 жыл бұрын
Hi Sidrah, answered.
@sidrahms7458
@sidrahms7458 3 жыл бұрын
I can't find your answer, I understand that we should use vif for continuous variables but what if I need to see correlation among all ordinal, numeric and nominal?
@beautyisinmind2163
@beautyisinmind2163 Жыл бұрын
can we remove highly negatively correlated features also or not? someone reply, please
@hemanthkumar42
@hemanthkumar42 3 жыл бұрын
Is multicollinearity is the problem for neural network?
@UnfoldDataScience
@UnfoldDataScience 3 жыл бұрын
Not always.
@akhileshgandhe5934
@akhileshgandhe5934 3 жыл бұрын
Hi Aman, I have 9 categorical and 6 numerical columns and it's a regression problem. So I can find the correlation between numerical using correlation heatmap but how to find the relation between categorical..?? Can I use chi square test..?? If I use I am getting all 9 categorical are dependent on each other. So what should be my next step..?? Please guide me. Thanks
@UnfoldDataScience
@UnfoldDataScience 3 жыл бұрын
Yes, chi square can be used, I have a dedicated video for the same topic.
@omkarlokhande3692
@omkarlokhande3692 Жыл бұрын
Sir what to do if the multi collinearity is affecting the binary classification problem
@UnfoldDataScience
@UnfoldDataScience Жыл бұрын
many ways to take care of it. I have discussed in classification videos.
@sandipansarkar9211
@sandipansarkar9211 3 жыл бұрын
finished watching
@shafeeqaabdussalam6195
@shafeeqaabdussalam6195 3 жыл бұрын
Thank you
@UnfoldDataScience
@UnfoldDataScience 3 жыл бұрын
Thanks again.
@trushnamayeenanda5431
@trushnamayeenanda5431 2 жыл бұрын
The independent variable with higher correlation among the similar factors should be removed
@MuhammadImran-o4c
@MuhammadImran-o4c 3 жыл бұрын
Thnks sr g I think uncecessary variable remove
@UnfoldDataScience
@UnfoldDataScience 3 жыл бұрын
Yes True.
@sudheeshe1384
@sudheeshe1384 3 жыл бұрын
You always rocks :)
@UnfoldDataScience
@UnfoldDataScience 3 жыл бұрын
Thanks for watching Sudheesh.
@KumarHemjeet
@KumarHemjeet 3 жыл бұрын
Remove that feature which is in less correlation with target.
@jaheerkalanthar816
@jaheerkalanthar816 2 жыл бұрын
I think which variable highly CO relate with target variable
@squadgang1678
@squadgang1678 2 жыл бұрын
I will find the correlation between x1 and y and x2 and y individually and see which one is lesser the one with lesser correlation i will delete it
@bezagetnigatu1173
@bezagetnigatu1173 2 жыл бұрын
Thank you!
@UnfoldDataScience
@UnfoldDataScience 2 жыл бұрын
Welcome.
@ameerrace2284
@ameerrace2284 3 жыл бұрын
Great video. Please create video on python implementation of Lasso and ridge regression
@UnfoldDataScience
@UnfoldDataScience 3 жыл бұрын
Thanks Ameer. Sure!!
@rohitnalage6366
@rohitnalage6366 2 жыл бұрын
Sir please explain Lasso and ridge if you made it,link pl.
@UnfoldDataScience
@UnfoldDataScience 2 жыл бұрын
kzbin.info/www/bejne/bYnZc6qHmrlshas kzbin.info/www/bejne/aGK3mH6erpZ6j5Y
@sujithreddy1599
@sujithreddy1599 3 жыл бұрын
It depends on feature importance. the feature with less importance will be dropped. correct me if am wrong :0
@UnfoldDataScience
@UnfoldDataScience 3 жыл бұрын
Correct Sujith
@anirudhchandnani9917
@anirudhchandnani9917 3 жыл бұрын
Hi Aman, Could you please make a detailed video explaining the difference between Gradient Boost, AdaBoost and ExtremeGradientBoosting? Why is AdaBoost called adaptive? Is it only because it edits the weights of the misclassified instances? XGBoost and GradientBoost also are adaptive in that way, arent they? Also, why are XGBoost and Gboost more robust to outliers than AdaBoost despite all of them having a term of log in their loss functions? Would really appreciate your reply. Thanks
@karthikganesh4679
@karthikganesh4679 3 жыл бұрын
Sir plz do the video for post pruning decision tree
@UnfoldDataScience
@UnfoldDataScience 3 жыл бұрын
ok Karthik
@sreejadas4417
@sreejadas4417 2 жыл бұрын
I want to be a data analyst but I want sequential courses from you please guide
@UnfoldDataScience
@UnfoldDataScience 2 жыл бұрын
www.unfolddatascience.com
@squadgang1678
@squadgang1678 2 жыл бұрын
Is Machine learning better than deep learning or deep learning better than machine learning
@UnfoldDataScience
@UnfoldDataScience 2 жыл бұрын
Depends on problem statement, data availability, Infra availability etc, can't say one is better then other
@squadgang1678
@squadgang1678 2 жыл бұрын
@@UnfoldDataScience oh ok got it ✌️
@naziakhatoon3058
@naziakhatoon3058 3 жыл бұрын
Jo less Cor related ho usko remove karna hai
@UnfoldDataScience
@UnfoldDataScience 3 жыл бұрын
True. "less correlated with target" :)
@khoaanh7375
@khoaanh7375 8 ай бұрын
this shit is pure gold
@ahmad3823
@ahmad3823 8 ай бұрын
at least two variables!
@tesfayesime9434
@tesfayesime9434 Жыл бұрын
Neither x1 or x2
@prateeksachdeva1611
@prateeksachdeva1611 2 жыл бұрын
excellent explanation
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