Group Based Modeling Trajectory R package trajeR version 1.0 Estimation of group-based trajectory models, including finite mixture models for longitudinal data, supporting censored normal, zero-inflated Poisson, logit, and beta distributions, using expectation-maximization and quasi-Newton methods, with tools for model selection, diagnostics, and visualization of latent trajectory groups, <doi:10.4159/9780674041318>, Nagin, D. (2005). Group-Based Modeling of Development. Cambridge, MA: Harvard University Press. and Noel (2022), <https://orbilu.uni.lu/>, thesis. Software Depends: R (>= 3.5) Imports: Rcpp (>= 1.0.4.6), minpack.lm, numDeriv, ucminf, MASS, capushe, stats, cli LinkingTo: Rcpp, RcppArmadillo Suggests: knitr, rmarkdown, spelling, kableExtra Cédric Noel <cedric.noel@univ-lorraine.fr> Comprehensive R Archive Network (CRAN) Cédric Noel [aut, cre], Jang Schiltz [aut] GPL (>= 2) 2026-08-03 application/tgz https://CRAN.R-project.org/package=trajeR doi:10.32614/CRAN.package.trajeR en-US