I currently work as a Senior Optimisation Analyst at SEEK. Our team provides an experimentation platform that is used to test the performance of new AI tools and services being developed at SEEK.
Previously, I worked as an academic biostatistician in several Australian and UK universities; my full CV can be found here.
I have interests in Bayesian inference, experimental design, survival analysis, and models for longitudinal data from cohort studies. I also enjoy statistical and probabilistic programming. I am a regular user of R and Python. I have contributed to the development of open-source software packages for R and Stan, as well as Python, CI/CD, and cloud-based infrastructure internally at SEEK.
My PhD – awarded by Monash University in 2018 – was entitled “Joint longitudinal and time-to-event models: development, implementation and applications in health research” and was supervised by Prof Rory Wolfe (primary), Dr Margarita Moreno-Betancur, and Dr Michael Crowther.
When not busy crunching data, I have a keen interest in hiking and travelling around some of the most epic spots on the globe.
PhD in Biostatistics, 2018
Monash University, Australia
MSc in Medical Statistics, 2015
University of Leicester, UK
BSc(Hons) in Statistics, 2007
University of Otago, NZ
A full list of my talks can be found here
simsurv is an R package for simulating survival (i.e. time-to-event) data. The user can simulate survival times from standard parametric survival distributions (exponential, Weibull, Gompertz), 2-component mixture distributions, or a user-defined hazard or log hazard function. The latter two features are those which likely separate the
simsurv package from other packages available for simulating survival data in R. The package implements the methods described in Crowther and Lambert (2013) and is modelled on the
survsim package available in the Stata software.
rstanarm is an extensive R package for Bayesian applied regression modelling. It is written and maintained by Ben Goodrich and Jonah Gabry. However, I have contributed code for fitting multivariate mixed models (the
stan_mvmer modelling function), joint longitudinal and time-to-event models (the
stan_jm modelling function), and time-to-event models themselves (the
stan_surv modelling function), as well as a number of post-estimation functions for obtaining predictions and diagnostics for the fitted models. Note that when you read this the
stan_surv modelling function may not yet be available in the CRAN version of rstanarm, in which case see the installation instructions here.
simjm is an R package package that allows the user to simulate data from a shared parameter joint model for longitudinal and time-to-event data. The shared parameter joint model from which the simulated data is generated is based on the model formulation described for the
stan_jm modelling function in the
rstanarm R package. The shared parameter joint model can be univariate (i.e. one longitudinal marker) or multivariate (i.e. more than one longitudinal marker) and a variety of parameterisations are allowed for the association structure between the longitudinal and event submodels.
devr2 is a Stata module that can be used to calculate a deviance based R-squared measure for models estimated using Stata’s
glm command. The measure is based on the method of Cameron and Windmeijer (1997). The module can be easily installed from within your Stata session; simply type
ssc install devr2 into the Command window.