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Explain PCA (Principal Component Analysis). When and how do you use it?

ML Concept: 5-7 minutes to answer

dimensionality-reductionfeature-engineeringunsupervisedreal-interview
Updated Dec 30, 2025

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Question

Explain PCA (Principal Component Analysis). When and how do you use it?

Expected time to answer: 5-7 minutes

Difficulty: intermediate

Tags: dimensionality-reduction feature-engineering unsupervised real-interview

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