Liu, Jin, Le Kang, Roy T. Sabo, Robert M. Kirkpatrick, and Robert A. Perera. “Two-Step Growth Mixture Model to Examine Heterogeneity in Nonlinear Trajectories”. Journal of Behavioral Data Science 1, no. 2 (August 28, 2021): 54–88. Accessed June 30, 2022. https://jbds.isdsa.org/index.php/jbds/article/view/21.