To install the Stata version:
net from http://www.andrew.cmu.edu/user/bjones/traj net install traj, force help trajReferences:
A SAS procedure based on mixture models for estimating developmental trajectories.
Advances in group-based trajectory modeling and a SAS procedure for estimating them.
A note on a Stata plugin for estimating group-based trajectory models.
Group-based multi-trajectory modeling.
Group-based Trajectory Modeling Extended to Account for Nonrandom Participant Attrition.