Feature-Based Clustering of Longitudinal Trajectories R package traj version 3.0.1 Identifies clusters of individual longitudinal trajectories. In the spirit of Leffondre et al. (2004), the procedure involves identifying each trajectory to a point in the space of measures. In this context, a measure is a quantity meant to capture a certain characteristic feature of the trajectory. The points in the space of measures are then clustered using a version of the Spectral Clustering algorithm. Software Depends: R (>= 2.10) Imports: stats, cluster, clusterCrit, fclust, igraph, e1071 Suggests: knitr, rmarkdown, testthat (>= 3.0.0) Laurence Boulanger <laurence.boulanger@umontreal.ca> Comprehensive R Archive Network (CRAN) Marie-Pierre Sylvestre [aut], Laurence Boulanger [aut, cre], Gillis Delmas Tchouangue Dinkou [ctb], Dan Vatnik [ctb] MIT + file LICENSE (https://CRAN.R-project.org/package=traj/LICENSE) 2026-03-16 application/tgz https://CRAN.R-project.org/package=traj doi:10.32614/CRAN.package.traj