Errata
Beginner's Guide to Principal Components
Errors and typos reported by readers, along with any found by Dr. Gwet himself. This page is updated as new items are confirmed — check back periodically if you own the book.
Page 2 · Footnote
"The larger data can be downloaded in CSV format …"
"The larger dataset can be downloaded in CSV format …"
"The larger dataset can be downloaded in CSV format …"
Page 22 · Equation 1.2.15
The bottom-right element of matrix \(C\) should be \(+1\), not \(-1\).
As printed
\[ C = \begin{pmatrix} 1 & -1 \\ 0.5 & -1 \end{pmatrix} \]
Corrected
\[ C = \begin{pmatrix} 1 & -1 \\ 0.5 & +1 \end{pmatrix} \]
No further errata have been reported at this time. If you find an error in the book, please get in touch via the Contact page.