Within-Subject Mediation Analysis Using Structural Equation Modeling // Within-subject mediation analysis using structural equation modeling. Examine how changes in an outcome variable between two conditions are mediated through one or more variables. Supports within-subject mediation analysis using the 'lavaan' package by Rosseel (2012) doi:10.18637/jss.v048.i02, and extends Monte Carlo confidence interval estimation to missing data scenarios using the 'semmcci' package by Pesigan and Cheung (2023) doi:10.3758/s13428-023-02114-4.