Within-Subject Mediation Analysis Using Structural Equation Modeling R package wsMed version 1.0.2 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>. Software Depends: R (>= 4.1.0) Imports: knitr, lavaan, semmcci, mice, semboottools, MASS, rlang, dplyr, ggplot2, methods, stats Suggests: rmarkdown, devtools, testthat Wendie Yang <1581075494q@gmail.com> Comprehensive R Archive Network (CRAN) Wendie Yang [aut, cre] (ORCID: <https://orcid.org/0009-0000-8388-6481>), Shu Fai Cheung [aut] (ORCID: <https://orcid.org/0000-0002-9871-9448>) GPL (>= 3) 2025-12-11 application/tgz https://CRAN.R-project.org/package=wsMed doi:10.32614/CRAN.package.wsMed