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Introduction to PmxStan: An R Library to Facilitate PKPD Modeling with Stan


Title: Introduction to PmxStan, An R Library to Facilitate PKPD Modeling with Stan
Date: 6 May 2016, 12:00:00 PM EST
Presenter(s): Yuan Xiong
Skill Level: (Intermediate)

Pharmacometrics Study Group Link:
Study Group Materials: PMXStan_ISoP_webinar.pdf (1.2 MB)
Calendar Addition (ics file) : invite.ics (1.2 KB)

ACOP6 Poster available by clicking below

Continuing the discussion from Introduction to PmxStan: An R Library to Facilitate PKPD Modeling with Stan:

Background: Using a Bayesian approach for making statistical inferences has been gaining popularity in recent years. Stan ( is a Bayesian probabilistic programming language that implements an efficient Hamiltonian Monte Carlo method suitable for fitting larger and more complex models, and these capabilities are attracting more and more users, pharmacometricians in particular.

Currently, two hurdles have largely limited a broad application of Stan in pharmacometrics: 1) a steep learning curve for pharmacometricians to write PKPD model-specific C+±like Stan code; 2) no efficient solvers to work seamlessly with Stan’s No-U-Turn Sampler (NUTS) for ordinary differential equations (ODEs) that are able to handle stiff ODE systems, often encountered in PKPD modeling.
Here we provide an R package called PMXStan to facilitate practical Bayesian PKPD modeling and simulation using Stan.

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@Brian @isoplinks you posted rxode links for the pmxstan webinar. are these the intended files?


@vijay, I removed them. Will await new files


Hi Yuan, there may be an issue with the sound. I can see your slides but cannot hear.


excellent, thank you for correcting. I can hear now!


is the sound working now?


yes, sounds great! thank you


I am less familiar with Stan. How similar or different are the dataset requirements for Stan vs. something like NONMEM?


NONMEM data is a table, Stan data is a list. We’ll come back to this Q at the end


it seems to force the diagnostics output only as a pdf, what if I am using something like rmarkdown and I want to print the results inline in a html document?


What are the requirements to need to recompile a model - how much can you change without going through recompilation? Eg at least can you change parameter estimates etc? I assume that changing the model structure would require a recompilation?

How do you cache models between R sessions, so don’t have to recompile each time you start again?


if your model does not change, you do not need to recompile. you can also save your workspace, and later use the compiled model, perhaps with different initials and/or data.


you can use it with .Rmd and/or Jupyter notebook. either one can give you an .html file


So priors can be only updated in the generated stand code and not input via the R function?


I think my question relating to dataset structure was just answered for me…it automates the conversion from NONME like dataset if I understand correctly


you are correct, Vijay. further improvement is needed here.


you are correct: data conversion is automatic.


This looks very promising - but where is the code available for everyone else to use? Is there a timeline on release?


will release via github soon


that is great news! I think this would be a great open source addition to our community