PCA horseshoe effect
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- Dominant language
- HTML
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- 171
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- Avg merge
- 12d 6h
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Description
The PCA plot of the barley data shows a pattern reminiscent of the horseshoe effect. We should mention this. See
- PCA ordination notes
- What is the "horseshoe effect" and/or the "arch effect" in PCA / correspondence analysis?
- Noise Reduction By Eigenvector Ordinations
- Detecting the Guttman effect with the help of ordinal correspondence analysis in synchrotron X-ray diffraction data analysis
- Horseshoes in multidimensional scaling and local kernel methods
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First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start with the PCA plot of the barley data in the linked embeddings chapter and review the cited PCA and horseshoe-effect references. Update the chapter to mention the observed horseshoe pattern, then confirm the rendered documentation presents the note alongside the plot.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- html
- Domain
- documentation
- Issue type
- Documentation
- Difficulty
- 2/5
- Estimated time
- 1-3 hours
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 55/100