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wording #52

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Oct 4, 2024
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wording #52

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10 changes: 5 additions & 5 deletions episodes/large_data.Rmd
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Expand Up @@ -359,11 +359,11 @@ accurate, though RSVD is much faster for file-backed matrices.

:::: challenge

The uncertainty from approximation error is sometimes psychologically
objectionable. "Why can't my computer just give me the right answer?" One way to
alleviate this feeling is to quantify the approximation error on a small test
set like the sce we have here. Using the `ExactParam()` class, visualize the
error in PC1 coordinates compared to the RSVD results.
The uncertainty from approximation error is sometimes aggravating. "Why can't my
computer just give me the right answer?" One way to alleviate this feeling is to
quantify the approximation error on a small test set like the sce we have here.
Using the `ExactParam()` class, visualize the error in PC1 coordinates compared
to the RSVD results.

::: solution
This code block calculates the exact PCA coordinates. Another thing to note: PC vectors are only identified up to a sign flip. We can see that the RSVD PC1 vector points in the
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