I'm the author of this tutorial, crazy to see it linked here 20yrs after I wrote it. It was an assignment for 400-level COSC at Otago, everyone in the class had to write a tutorial on something and then present it. The department just happened to post them on their website.
Crazily, this tutorial must have filled a niche because I still get people contacting me about it, and it has 3000 references on Google Scholar. I'm glad it's helped so many people, I'm no expert in PCA or Maths in general, I learned what I needed to write the tutorial and the example code and I think the writing style must have been pretty good as lots of people seem to have been able to follow it.
Crazily, this tutorial must have filled a niche because I still get people contacting me about it, and it has 3000 references on Google Scholar. I'm glad it's helped so many people, I'm no expert in PCA or Maths in general, I learned what I needed to write the tutorial and the example code and I think the writing style must have been pretty good as lots of people seem to have been able to follow it.