A Note on a Stata Plugin for Estimating Group-based Trajectory Models

2013/09/30 by Bobby L. Jones, Daniel S. Nagin · 938 citations
Decision Sciences · Mathematics · Social Sciences · #Computer science #Covariate #Demography #Econometrics #Group (periodic table) #Insurance, Mortality, Demography, Risk Management #Logistic regression #Mathematical economics #Mathematics #Outcome (game theory) #Plug-in #Poisson distribution #Poisson regression #Population #Statistical Methods and Bayesian Inference #Statistics #Trajectory #demographic modeling and climate adaptation

paper · doi:10.1177/0049124113503141

published in Sociological Methods & Research 42(4), 608-613 (SAGE Publishing)

openalex publication_date 2013/09/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06

Abstract

Group-based trajectory models are used to investigate population differences in the developmental courses of behaviors or outcomes. This note introduces a new Stata command, traj, for fitting to longitudinal data finite (discrete) mixture models designed to identify clusters of individuals following similar progressions of some behavior or outcome over age or time. Normal, Censored normal, Poisson, Zero-inflated Poisson, and Logistic distributions are supported.

Citations

• A SAS Procedure Based on Mixture Models for Estimating Developmental Trajectories

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