nlmixr2 is becoming a R Consortium Working Group

nlmixr2 Working Group We are very excited to announce we are joining the R consortium as a Working Group (WG). Our vision will remain the same: The vision of nlmixr2 is to develop a R-based open-source nonlinear mixed-effects modeling software package that can compete with commercial pharmacometric tools and is suitable for regulatory submissions. What is a R Consortium Working Group? A R Consortium ISC working group is a group of volunteers for a project that “requires the skills not possessed by a single individual, or the amount of work required is more than can be accomplished by a single person in a reasonable amount of time.

laplace and agq estimation methods

nlmixr2 log-likelihood In 2022 we announced the focei log-likelihood. However, in our last advisory committee meeting Mats Karlsson pointed out that focei log-likelihood may not be the best approach. He believed that Stuart L. Beal and Lewis B. Sheiner did not include this method since they may have been trying to protect users from methods that may not make sense (for example, maybe focei log-likelihood is not an accurately enough approximation of the likelihood).

mceta – Monte-Carlo focei?

nlmixr2 4.0 mceta Two of popular algorithms for fitting nonlinear fixed effects models in pharmacometrics are first order conditional estimation (with interaction), sometimes called focei. This is often considered a classical estimation method As time progressed, Monte-Carlo methods started being used, such as stochastic approximation estimation-maximization (saem). This uses Mote-Carlo Methods to try to find the maximum expectation of the nonlinear-mixed effects model. The new feature I am discussing is mceta for focei, which combines the Monte-Carlo sampling with focei.

nlmixr2 verse 4.0+

nlmixr2 4.0 verse As promised, I am discussing some other change that are breaking and makes nlmixr2 a major release. First is a very visible change as you load nlmixr2: library(nlmixr2) ## ── Attaching packages ───────────────────────────────────────────────────────── nlmixr2 4.0.1 ── ## ✔ lotri 1.0.2 ✔ monolix2rx 0.0.6 ## ✔ nlmixr2data 2.0.9 ✔ nlmixr2lib 0.3.0 ## ✔ nlmixr2est 4.1.0 ✔ nlmixr2rpt 0.2.1 ## ✔ nlmixr2extra 3.0.3 ✔ nonmem2rx 0.1.8 ## ✔ nlmixr2plot 3.

nlmixr2 4.0

nlmixr2 4.0 We at the nlmixr2 team are committed to quality results. This is seen in line with our vision: The vision of nlmixr2 is to develop a R-based open-source nonlinear mixed-effects modeling software package that can compete with commercial pharmacometric tools and is suitable for regulatory submissions. This release furthers the quality by changing linear compartment models the ADVAN solutions to the WNL solutions(both claim to be something that NONMEM is using for the linear solved systems).