From time to time I will write about things. I will list the things here.

• Keep using plate notation Someone was wrong on the internet. In particular, someone expressed their (questionable) beliefs about plate notation. These are my feelings about that.
• Theoretical data science background I: functional optimization First post in a (maybe) multipost series of theoretical background for data scince. Here lie Euler-Lagrange equations, the general supervised learning problem, and time series smoothing.
• Perturbing correlation matrices: on what we can do when we are presented with a correlation matrix and not with the data that generated it
• Continuum rich-get-richer dynamics and survival theory: on the non-obvious connection between the kernel function of a rich-get-richer process and the hazard function of a random variable.