# A list of neat/useful math stuff

(This list will be updated occasionally.)

- The $R_1$ quasi-random sequence, which seems to have good properties without the complexity of Sobol’s Sequence.
- Random-swap EM and deterministic-annealing EM. I’ve implemented the former in Julia here.
- The iterated Laplace approximation. The iterLap package implements this in R.
- Also see the modified version, which is slower but more accurate, here.
- This is related to the multi-modal Laplace approximation, which is described in Chapter 12 of
*Bayesian Data Analysis*.

- Soranzo & Epure’s approximation to the normal CDF and quantile functions.
- The sin-arcsinh(-normal) distribution