Miscellaneous

Important Side Topics

Self administered module evaluations

Covid-19 Waves by Province in South Africa

Recent presentations

Presentation for StatCon2020: Stan as an all-purpose modelling solution (video version with my voice). Also available is the slides and source code zipped up.

Departmental presentation: Three mildly interesting consultation projects

Discussion with computer science honours students

Presentation on the magic of markdown for SASA 2019, including the example of doing an assignment where each student gets unique data and their own memo and the example of incorporating interesting models with STAN into the research or consultation workflow. Source for the examples are available here and here respectively, and data here, while the source for the presentation itself can be downloaded here.

Department presentation on statistical modelling with Stan

Flash facts presentation for UFS discussion

Department presentation on Adventures in Statistical Consulation

Random topics

Distribution visualisation app, useful for undergrad stats.

Hypothesis test generator.

Useful code for teaching and research.

Arithmetic game

My EXCEL addin with tons of useful functions like copying tables in R or LateX format, simulating many distributions, logit transforms, deleting alternating columns, etc. Must be manually placed in C:\Users\You\AppData\Roaming\Microsoft\Addins and then activated in EXCEL via File->Options->Addins->Go.

List of Sean’s Shiny apps warning: these may be under construction at any time

Prof. van Zyl asked me to check the formula for the asymptotic variance of the sample kurtosis on Wikipedia empirically. This is an excellent introduction to the idea of a simulation study. It is also a good example of R markdown if you look at the source here. Connected to this is a deeper study of sample kurtosis for Stable distributions, in which we show that $E\left[\frac{\text{excess sample kurtosis}}{\text{sample size}}\right]\approx 1-\frac{\text{tail index}}{2}$.

This study has now been published open access and is available at the South African Statistical Journal website.

Here’s an interesting basic probability problem solved with R Markdown.

Older research work

Publications

Reports (not peer reviewed)

Sean van der Merwe
Coordinator of UFS Statistical Consultation Unit

Statistician