Tim Waterhouse

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42 Following
33 Posts
Pharmacometrician or statistician, depending on who's asking.
We are excited to announce a new feature in nlmixr2: mceta for FOCEi. This is a hybrid approach combines Monte-Carlo sampling with the classical FOCEi algorithm bringing flexibility & robustness to nonlinear mixed-effects modeling in pharmacometrics. #nlmixr2 #rstats

To fully realize the potential of our clinical trials, we must go beyond randomization, and use causal inference and pharmacometric modelling and simulation. Advancing both we show that non-linear mixed effects modelling implements the equivalent of standardization in causal inference. Dive into this if you're into #causal #causalinference #DAGs #pharmacometrics, or clinical development #stats.

https://doi.org/10.1002/psp4.13239

Another pharmacometrics #rstats post, this time about running simulations with mrgsolve

https://blog.djnavarro.net/mrgsolve

Notes from a data witch - Pharmacometric simulation with mrgsolve

Yet another post in the ever-expanding series where Danielle teaches herself pharmacometric modelling, which I’m certain is thrilling to everyone

Finally managed to get started with Torsten

https://blog.djnavarro.net/torsten/

Notes from a data witch - Getting started with Torsten

Another small step along the path to Bayesian pharmacometrics

After a false start yesterday I've written up a blog post on population pharmacokinetic models in Stan and #rstats. I'm honestly not sure who the audience for this one is. In truth I wrote it to teach myself something, so the audience might just be me. But it's there now so I might as well share 🙂

https://blog.djnavarro.net/pop-pk-models/

Notes from a data witch - Building a population pharmacokinetic model with Stan

In which the author works her way through the first part of an online tutorial, rewrites some NONMEM code in Stan, and takes notes

Automatic Conversion between NONMEM and nlmixr2 models!

The nlmixr2/rxode2 team is excited to announce a tool to help conversion of NONMEM to rxode2 or nlmixr2 fits with nonmem2rx and babelmixr2

See

http://localhost:3372/blog/2023-06-02-nonmem2rx-and-babelmixr2/

A couple of blog posts on pharmacokinetic models that I hadn't gotten around to sharing before:

https://blog.djnavarro.net/non-compartmental-analysis/

https://blog.djnavarro.net/stan-ode/

The first one talks about non-compartmental analysis and has some very simple R code, the second one dives a little deeper and talks about compartmental models - which often require you to use an ODE solver in the model - in Stan and R.

I'm still learning pharmacokinetics so they're a little rough around the edges

#rstats

Notes from a data witch - Non-compartmental analysis

A heavily oversimplified discussion of a simple pharmacokinetic tool, written as an exercise in teaching myself something new. Learning new things is always fun

The pharmacometrics group led by France Mentré and Jérémie Guedj (UMR1137 INSERM, Université Paris Cité) is hosting the third Stan  for Pharmacometrics event on the 8th June in Paris.

This one day-conference will feature several speakers, including Andrew Gelman and Aki Vehtari @avehtari. More speakers will be confirmed soon (the tentative list is great).

A preliminary program and details for free registration are available at https://stan4pmx.sciencesconf.org/

#Stan #Bayesian

Stan for Pharmacometrics - Sciencesconf.org

#introduction 35 year old engineer / pharmacometrician / computer scientist. Loves building things, reading science papers, learning crazy facts, and having an open mind. Agree to disagree, as long as I understand how you came to that viewpoint.
Built Simulo, a now-defunct clinical trial simulation software. PhD in precision dosing software and simulation.
Currently working at Janssen Pharmaceutica.