Blog

Checking whether stringy05 is suitable as a projection pursuit index

Before using stringy05 inside a guided tour, I first check whether it behaves like a useful projection pursuit index.
16 Jun 2026

Adding a Stringy Projection Pursuit Index to tourr

GSoC
tourr
projection pursuit
scagnostics
guided tour

Developing and testing stringy scagnostic projection pursuit index for finding string-like structures in high-dimensional data.

04 Jun 2026
 

Exploring outlier removal in cassowaryr: 1.5 IQR or 3 IQR?

cassowaryr
scagnostics
outlier-removal
minimum-spanning-tree
bivariate-gaussian

An exploration of MST-based outlier removal in cassowaryr, comparing the current 1.5 IQR rule with Tukey’s 3 IQR outer fence on bivariate Gaussian data.

01 Jun 2026

Exploring the Growth Rate of the stringy05 Index

scagnostics
minimum spanning tree
stringy05
asymptotic analysis
R

A theoretical and empirical exploration of the stringy05 scagnostic index.

26 May 2026

Exploring Iterative Outlier Removal in cassowaryr

cassowaryr
scagnostics
outlier-removal
bivariate-gaussian
preprocessing
rescaling

An exploration of how iterative MST-based outlier removal behaves on bivariate Gaussian noise, why Gaussian tail points may be removed geometrically, and what this implies for scagnostic rescaling in cassowaryr.

25 May 2026

Debugging and Testing the Corrected stringy05 Scagnostic Index

scagnostics
cassowaryr
shape-analysis
R

A simulation-based walkthrough of debugging the stringy05 index, correcting its MST-based definition, and testing whether the modified version stays within the expected 0 to 1 range.

25 May 2026

Testing Scagnostic Rescaling Across Preprocessing Settings

scagnostics
cassowaryr
shape-analysis
simulation
R

Exploring whether fitted 95th percentile noise models for scagnostic indices remain valid when cassowaryr preprocessing choices change.

19 May 2026

Fixing Alpha Shapes: What I Learned About the Alpha Parameter

scagnostics
cassowaryr
shape-analysis
R

In this post, I dive into the weirdness of the alpha parameter in alpha hulls, why it caused problems with the skinny index, and how I try to deal with it to uncover the real structure in my data.

19 May 2025

Debugging Alpha Parameter in cassowaryr package

R
Scagnostics
data-viz

In this blog, I’m going to tell you how I came across a problem with the alpha parameter in the cassowaryr package while playing around with shape analysis and scagnostics, and how I figured out what was going wrong and fixed it.

18 May 2025
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