Source: Data are from the TV, School, and Family Smoking Project (Flay et al., 1988, Preventive Medicine 17: 585-607, https://doi.org/10.1016/0091-7435(88)90053-9; Rabe-Hesketh and Skrondal, 2021, Multilevel and Longitudinal Modeling Using Stata, 4th ed., chap. 11)