Practice question · True or false
A dataset with 50 correlated features can be well approximated using far fewer dimensions.
Hints
- What does correlation mean about redundancy?
- Correlated features carry overlapping information.
Show the answer
True
Why
True. Correlated features are partly redundant, so the data lies near a lower-dimensional subspace and a few principal components capture most of the variance. That is what PCA finds, and it is why 'number of columns' and 'intrinsic dimension' are different numbers.
Practise Linear Independence and Basis
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