Miscellany and unpolished chapters

The term is approaching rapidly, and I will not be able to add more content at the quality we’ve been used to. So I will park some of my older unpublished stuff here which we will use this year. I will sort through this, improve it, and add / move bits in future

Likely topics include:
- better figures.
- better figures in R.
- causal inference.
- model diagnostics.
- using chatbots to improve stats.
- using AI agents - GLMs.
- Mixed effect models,
- Robust statistics.
- Intro to probability theory - \(\chi^2\).