Stat 147 Class Activity on PCA

Stat 147 Class Activity on PCA

University

8 Qs

quiz-placeholder

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Stat 147 Class Activity on PCA

Stat 147 Class Activity on PCA

Assessment

Quiz

Mathematics

University

Practice Problem

Hard

Created by

Joemari Olea

Used 2+ times

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8 questions

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1.

MULTIPLE CHOICE QUESTION

20 sec • 1 pt

TRUE or FALSE: Doing PCA on the correlation matrix of the random vector is equivalent to doing PCA on the standardized version of the random vector.

TRUE

FALSE

2.

MULTIPLE CHOICE QUESTION

20 sec • 1 pt

TRUE or FALSE: In Single Value Decomposition, the principal components are derived directly from the correlation matrix of the dataset.

TRUE

FALSE

3.

MULTIPLE CHOICE QUESTION

20 sec • 1 pt

TRUE or FALSE: If we conduct PCA on a random vector that follows multivariate normal, then the principal components will be independent.

TRUE

FALSE

4.

MULTIPLE CHOICE QUESTION

20 sec • 1 pt

TRUE

FALSE

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The sum of the variances of all the principal components derived from the covariance matrix is equal to ____________.

1

p

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

If we are conducting PCA based on the correlation matrix, then according to Kaiser's Rule (with correction from Joliffe), we retain the PCs wherein ____________.

The eigenvalues are greater than or equal to 0.7.

The eigenvectors are normalized.

The eigenvalues are lower than the average of the eigenvalues.

There is an elbow in the Scree Plot.

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

When there is little correlation between the original variables

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