Computer scienceData scienceMachine learningData preprocessingFeature engineering

Principal component analysis

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After standardization, we calculated the covariance matrix for cell size, number of chromosomes, and DNA replication time:

$\begin{bmatrix} 1 & 0.25 & 0.13\\ 0.25 & 1 & 0.75\\ 0.13 & 0.75& 1 \end{bmatrix}$ How many PCs should you choose to explain 85% of the total variance?

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