15. Symmetric Matrices, Spectral Ideas, and Applications
Principal Component Intuition — Quiz
Test your understanding of principal component intuition with 5 practice questions.
Practice Questions
Question 1
In principal component analysis, what does the first principal component usually describe?
Question 2
Why do we often center data before applying principal component analysis?
Question 3
How are different principal components related to each other in the standard PCA setting?
Question 4
In principal component analysis, an eigenvector of the covariance matrix is best thought of as what?
Question 5
If the first principal component explains $80\%$ of the variance, what does that mean?