Mplus Base Program and Multilevel Add-On 8.8

Mplus Base Program and Multilevel Add-On is a comprehensive software package for advanced statistical modeling, designed to make complex analyses accessible through a concise, script-based workflow. The Base Program supports a wide range of latent variable and regression models—including path analysis, confirmatory and exploratory factor analysis, structural equation modeling (SEM), growth curve models, and regression for continuous, categorical, and count outcomes. It offers modern estimation options, missing data handling, model fit diagnostics, and Monte Carlo simulation, making it suitable for rigorous, reproducible research.

The Multilevel Add-On extends these capabilities to hierarchical data, enabling two-level modeling with within- and between-level structures. It supports multilevel path analysis and SEM, random intercepts and slopes, cross-level interactions, multilevel factor analysis and growth models, and mediation in clustered settings. This combination is well suited to applications in psychology, education, public health, social sciences, and related fields where individuals are nested within higher-level units.

Key features:

• Broad model coverage: CFA/EFA, SEM, path analysis, growth models, and generalized regression
• Multilevel modeling: two-level SEM, random effects, cross-level interactions, and multilevel mediation
• Flexible data types: continuous, categorical, count, and censored outcomes
• Robust estimation and missing data methods
• Clear, interpretable output with fit indices and standardized estimates
• Scriptable syntax for reproducibility and batch processing
• Applicable to large, real-world datasets across disciplines

This package provides a powerful, integrated environment for modeling complex relationships, especially when data are nested or clustered.

Mplus Base Program and Multilevel Add-On is developed by Muthen & Muthen. The most popular versions of this product among our users are: 7.3, 7.4, 8.3, 8.7 and 8.8.