Longitudinal influence of alcohol and marijuana use on academic performance in college students
Bar plot of GPA (estimated marginal means) across semesters by cluster. Post-hoc between-group analysis (using a sidak correction for multiple comparisons) is also indicated. Between-cluster, post-hoc significances are marked as follows: ***p<0.001, **p<0.005,*p<0.01. Note: Error bars represent standard error of mean.