Q218
Which of the following statements are true for a design matrix X ∈ Rn×d with d > n? (The rows are n sample points and the columns represent d features.)
A.
least-squares linear regression computes the weights w = (xtx)-1 xty
B.
the sample points are linearly separable
C.
x has exactly d - n eigenvectors with eigenvalue zero
D.
at least one principal component direction is orthogonal to a hyperplane that contains all the sample points
AnswerAnswer: Option D
Solution
Answer: Option D
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