01 Batch PCA

01 Batch PCA

University

10 Qs

quiz-placeholder

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01 Batch PCA

01 Batch PCA

Assessment

Quiz

Science

University

Practice Problem

Easy

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10 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

10 sec • 1 pt

"Centering" the dats for PCA is

optional

a must

a nice to have

What is centering?

2.

MULTIPLE CHOICE QUESTION

20 sec • 1 pt

all negative

all positive and real

complex

imaginary

3.

MULTIPLE CHOICE QUESTION

10 sec • 1 pt

The Principal Components (PCs) are invariant to scale differences between dimensions (T/F)?

True

False

4.

MULTIPLE CHOICE QUESTION

20 sec • 1 pt

If I scale the entire dataset X by a constant factor a=5, the directions of the PCs ...

remain the same.

change directions.

increase length.

decrease length.

5.

MULTIPLE CHOICE QUESTION

20 sec • 1 pt

What changes when I compute the PCs on a scaled version of X? (e.g. PCA(X) vs. PCA(5*X))

Nothing.

The Eigenvalue changes.

The Eigenvectors change direction.

The Eigenvectors change in magnitude.

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

PCA(X) vs. PCA(5*X): How will the Eigenvalue change?

7.

MULTIPLE CHOICE QUESTION

10 sec • 1 pt

Which is not a suitable application for PCA?

dimensionality reduction

data visualisation

image classification

compression

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