See all my videos at www.tilestats.com/ 1. Introduction 2. Collinearity (01:07) 3. How PCR works (03:46) 4. Predict (08:30) 5. Extract components(08:50) 6. PCR vs PLS (13:17)
You are the best in my opinion. And I'm not bluffing
@tedransom8087
2 жыл бұрын
Thank you so much for this video! It really helped me to understand PCR.
@tilestats
2 жыл бұрын
Thanks
@mipchen
5 ай бұрын
Thank you very much; very well explained!
@ToanNguyenVan-re2oz
Жыл бұрын
thank you so much! It really helped me
@mingxiuwang5126
Жыл бұрын
If I want to fit a linear regression model after pca, do I need to regress y on centered score or centered y on centered score? I have been confused about this question.
@tilestats
Жыл бұрын
It should not matter because centering y only affects the estimated intercept...
@bbnn7271
Жыл бұрын
Here bellow is my model obtained after standardization ((X-mean)/stdev) of your sample data and PC1 and PC2 calculation: Y= -3.75Chol+5.20Age+375
@MIZRAIM1984
11 ай бұрын
Thanks a lot. I have got a question: that's right, PCR is designed to resolve regression tasks. And what about classification? For instance, two classes are assigned as an output. The variables are reduced to the principal components, ok. Is it correct to use the obtained PCs for classification instead of original variables afterwards? Thanks for consultation!
@tilestats
11 ай бұрын
Yes, that works. Have a look at this video about LDA where I compare PCA and LDA for classification: kzitem.info/news/bejne/y6uiq6V3a6GrlnY I also have a video about PLS-DA kzitem.info/news/bejne/26d8wGSjfpVoZ6A
@itsbuttersthecanine2477
Жыл бұрын
do we need to center the data?
@tilestats
Жыл бұрын
No, but it simplifies the calculations.
@manishpanchasara9975
2 жыл бұрын
I tried to purchase books (ePDFs) but it seems that the payment system is not working properly.
@tilestats
2 жыл бұрын
We just tried it, and it works. Maybe it was a temporary thing.
@manishpanchasara9975
2 жыл бұрын
@@tilestats Not happening. I hope that you might be having some country specific criteria. will suggest you to kindly email me a separate link for making payment.
@tilestats
2 жыл бұрын
Send an email to andreas.tilevik@gmail.com
@mdmahmudulhasanmiddya9632
2 жыл бұрын
Epdf on which topic sir please reply
@manishpanchasara9975
2 жыл бұрын
@@mdmahmudulhasanmiddya9632 Logistic Regression
@mustafahelal6878
5 ай бұрын
If PC1 is assumed as explatory variable and use least square then B0 is -75 and B1 is 1.85 How you get B0 = -83.9 and B1 = 1.932
@tilestats
5 ай бұрын
The scores of PC1 were rounded, which explains the difference. If you use the rounded scores, you will get what you say. Here are more exact values for PC1: 104.9293 107.7236 109.3397 110.5179 112.1340 114.9283
@younique9710
3 ай бұрын
Thank you! I know PCA regression is an alternative of a multivariate regression to deal with multicollinearity. So, is PCA regression always better for prediction than a standard linear regression?
@tilestats
3 ай бұрын
It is harder to interpret the coefficients in PCR, so I would select linear regression as long as its assumptions are fulfilled.
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