How do you decide on the number of Principal Components to retain during PCA?

  • All of the above
  • By calculating the cumulative explained variance
  • By checking the eigenvalues
  • By using the elbow method
The number of principal components to retain can be decided in several ways: checking the eigenvalues (typically, components with eigenvalues greater than 1 are retained), using the elbow method (looking for a clear "elbow" in the scree plot), or calculating the cumulative explained variance (often, enough components to explain at least 95% of the variance are retained).
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